SDADP-UC-001 - SANDISK

KSZ8851SNL/SNLI

Single-Port Ethernet Controller

with SPI Interface

Rev. 2.0

LinkMD is a registered trademark of Mic rel, Inc.

Magic Packet is a tradem ark of Advanced Micro Devices, Inc.

MLF and M icroLeadFrame are registered tr ademarks of Amkor Te chnology , Inc.

Product names used in this datasheet are for identification purposes

only and may be trademarks of their respective companies.

Micrel Inc. • 2180 Fort une Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http:// www.mic rel .c om

August 2009 M9999-083109-2.0

General Description

The KSZ8 851SNL is a single-chip Fast Ethernet controller

consisting of a 10/100 physical layer transceiver (PHY), a

MAC, and a Serial Peripheral Interface (SPI). The

KSZ8851SNL is designed to enable an Ethernet network

connectivity with any host micro-controller equipped with

SPI interface. The KSZ8851SNL offers the most cost-

effective solution for adding high-throughput Ethernet link

to traditional embedded systems with SPI interface.

The KSZ8851SNL is a single chip, mixed analog/digital

device offering Wake-on-LAN technology for effectively

addressin g Fast Ether net a pplicati ons. It consis ts of a Fas t

Ethernet MAC controller, SPI interface and incorporates a

unique dynamic memory pointer with 4-byte buffer

boundar y and a f ully utili zable 18KB f or both TX (alloc ated

6KB) and RX (allocated 12KB) directions in host buffer

interface.

The KSZ8851SNL is designed to be fully compliant with

the appropriate IEEE 802.3 standards. An industrial

temperature-grade version of the KSZ8851SNL, the

KSZ8851 SN LI is als o a va il able ( s ee “O r dering Inform atio n”

section).

LinkMD®

Physical signal transmission and reception are enhanced

through the use of analog circuitry, making the design

more efficient and allowing for lower-power consumption.

The KSZ8851SNL is designed using a low-power CMOS

process that features a single 3.3V power supply with

options for 1.8V, 2.5V or 3.3V VDD I/O. The device

includes an extensive feature set that offers management

information base (MIB) counters and a fast SPI interface

with clock speed up to 40MHz.

The KSZ8851SNL includes unique cable diagnostics

feature c alled Link MD®. This feature determ ines the length

of the cablin g plant and also ascertains if there is an open

or short condition in the cable. Accompanying software

enables the cable length and cable conditions to be

conveniently displayed. In addition, the KSZ8851SNL

supports Hewlett Packard (HP) Auto-MDIX thereby

eliminating the need to differentiate between straight or

crossover cables in applications.

Functional Diagram

Figure 1. KSZ8851SNL/SNLI Functional Diagram

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Features

• Integrated MA C and PH Y Ethernet Controller fully

complian t with IEE E 802. 3/ 802. 3u sta ndar ds

• SPI Interface with clock speeds up to 40MHz for high

throughput applications

• Supports 10BASE-T/100BASE-TX

• Supports IEEE 802.3x full-duplex flow control and half-

duplex backpressure collision flow control

• Supports RXQ and TXQ FIFO DMA for fast data read

and write transf er s

• Supports IP Header (IPv4)/TCP/UDP/ICMP checksum

generation and checking

• Supports IPv6 TCP/UDP/ICMP checksum generation

and checking

• Automatic 32-bit CRC generation and checking

• Supports simple command and data phases in SPI

cycle for RXQ/TXQ FIFO and registers read/write

• Supports multiple data frames for TXQ FIFO and RXQ

FIFO without additional command phase

• Supports flexible Byte (8-bit), Word (16-bit) and Double

word (32-bit) read/write access to internal registers

• Larger internal memory with 12K Bytes for RX FIFO and

6K Bytes for TX FIFO. Programmable low, high and

overrun wat ermark for flow control in RX FIFO

• Efficient architecture design with configurable host

interrupt schemes to minimize host CPU overhead and

utilization

• Powerful and flexible address filtering scheme

• Optional to use external serial EEPROM configuration

for MAC address

• Single 25MHz reference clock for both PHY and MAC

• HBM ESD Rating 6kV

Power Modes, Pow er Suppli es, and Packaging

• Single 3.3V power supply with options for 1.8V, 2.5V

and 3.3V VDD I/O

• Built-in integrated 3.3V or 2.5V to 1.8V low noise

regulator (LDO) for core and analog blocks

• Enhanced power management feature with energy

detect mode and soft power-down mode to ensure low-

power dissipation during device idle periods

• Comprehensive LED indicator support for link, activity

and 10/100 speed (2 LEDs)

– User programmable

• Low-power CMOS design

• Commercial Temperature Range: 0oC to +70oC

• Industrial Temperature Range: –40oC to +85oC

• Available in 32-pin (5mm x 5mm) MLF® package

Additional Features

In addition to offering all of the features of a Layer 2

controller, the KSZ8851SNL offers:

• Supports to add two-byte before frame header in order

for IP fram e content with doubl e word bou ndary

• Micrel LinkMD® cable diagnostic capabilities to

determine cable length, diagnose faulty cables, and

determine distance to fault

• Wake-on-LAN functionality

– Incorporates Magic Packet™, wake-up frame, network

link state, and detection of energy signal technology

• HP Auto MDI-X™ crossover with disable/enable option

• Ability to transmit and receive frames up to 2000 bytes

Network Features

• 10BASE-T and 100BASE-TX physical layer support

• Auto-neg oti ati on: 10/1 00 M bps f ull and ha lf duplex

• Adaptive equalizer

• Baseline wander correction

Applications

• Video/Audio Distribution Systems

• Voice over IP (VoIP) and Analog Telephone Adapters

(ATA)

• Building Automation

• Home Base Control with Ethernet Connection

• Industrial Control Sensor Devices (Temperature,

Pressure, Levels, and Valves)

• Security, Motion Control and Surveillance Cameras

Markets

• Fast Ethernet

• Embedded Ethernet

• Industrial Ethernet

• Embedded Systems

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Ordering Information

Part Number Temperature Range Package Lead Finish

KSZ8851SNL TR 0oC to 70oC 32-Pin MLF® (QFN per JDEC) Pb-Free

KSZ8851SNLI TR –40oC to +85oC 32-Pin MLF® (QFN per JDEC) Pb-Free

KSZ8851SNL-Eval Evaluation Board for the KSZ8851SNL

Revision History

Revision Date Summary of Changes

1.0 06/30/2008 First released Information.

1.1 2/13/2009 Improved EDS Rating up to 6KV, revised Ordering Information and updated Table content

and description.

2.0 8/31/2009 To tri-state the SO output when CSN is de-asserted. To use falling edge of SCLK to send

data out (SO) and to support 40MHz SPI clock rate. Change revision ID from “0” to “1” in

CIDER (0xc0) register. To enable software read or write external EEPROM. Update pins

5, 9, 23 description for 1.8V VDD_IO supply.

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Contents

Pin Configuration................................................................................................................................................................10

Pin Description....................................................................................................................................................................11

Strapping Options...............................................................................................................................................................12

Functional Description .......................................................................................................................................................13

Functional Overview...........................................................................................................................................................13

Power Management........................................................................................................................................................13

Normal Operation Mode...........................................................................................................................................13

Energy Detect Mode ................................................................................................................................................13

Soft Power Down Mode ...........................................................................................................................................14

Power Saving Mode.................................................................................................................................................14

Wake-on-LAN.................................................................................................................................................................14

Detection of Energy..................................................................................................................................................14

Detection of Linkup ..................................................................................................................................................14

Wake-up Packet.......................................................................................................................................................15

Magic Packet............................................................................................................................................................15

Physical Layer Transceiver (PHY)..................................................................................................................................16

100BASE-TX Transmit..............................................................................................................................................16

100BASE-TX Receive...............................................................................................................................................16

PL L Cl o ck Sy n th e si z e r ( Re c ov e ry).............................................................................................................................16

Scrambler/De-scrambler (100BASE-TX only) ............................................................................................................16

10BASE-T Transmit ..................................................................................................................................................16

10BASE-T Receive ...................................................................................................................................................16

MDI/MDI-X Auto Crossover......................................................................................................................................17

Straight Cable....................................................................................................................................................17

Crossover Cable................................................................................................................................................17

Auto Negotiation.......................................................................................................................................................18

LinkMD® Cable Diagnostics.....................................................................................................................................19

Access...............................................................................................................................................................19

Usage ................................................................................................................................................................20

Media Access Control (MAC) Operation ........................................................................................................................20

Inter Packet Gap (IPG).............................................................................................................................................20

Back-Off Algorithm...................................................................................................................................................20

Late Collision............................................................................................................................................................20

Flow Control.............................................................................................................................................................20

Half-Duplex Backpressure .......................................................................................................................................21

Address Filtering Function .......................................................................................................................................21

Clock Generator.......................................................................................................................................................22

Serial Peripheral Interface (SPI).....................................................................................................................................22

SPI Internal I/O Registers Access Operation Timing...............................................................................................23

SPI TXQ/RXQ FIFOs Access Operation Timing......................................................................................................23

Queue Management Unit (QMU)....................................................................................................................................24

Transmit Queue (TXQ) Frame Format.....................................................................................................................24

Frame Transmitting Path Operation in TXQ ............................................................................................................25

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Driver Routine for Transmit Packet from Host Processor to KSZ8851SNL.............................................................26

Receive Queue (RXQ) Frame Format.....................................................................................................................29

Frame Receiving Path Operation in RXQ................................................................................................................29

Driver Routine for Receive Packet from KSZ8851SNL to Host Processor..............................................................30

EEPROM Interface.........................................................................................................................................................31

Loopback Support...........................................................................................................................................................32

Near-end (Remote) Loopback..................................................................................................................................32

Far-end (Local) Loopback........................................................................................................................................32

SPI Interface to I/O Registers.............................................................................................................................................33

I/O Registers...................................................................................................................................................................33

Internal I/O Registers Space Mapping............................................................................................................................34

Register Map: M AC, PHY and QMU...................................................................................................................................40

Bit Type Definition...........................................................................................................................................................40

0x00 – 0x07: Reserved...................................................................................................................................................40

Chip Configuration Register (0x08 – 0x09): CCR ..........................................................................................................40

0x0A – 0x0F: Reserved..................................................................................................................................................40

Host MAC Address Registers: MARL, MARM and MARH.............................................................................................40

Host MAC Address Register Low (0x10 – 0x11): MARL................................................................................................41

Host MAC Address Register Middle (0x12 – 0x13): MARM...........................................................................................41

Host MAC Address Register High (0x14 – 0x15): MARH ..............................................................................................41

0x16 – 0x1F: Reserved ..................................................................................................................................................41

On-Chip Bus Control Register (0x20 – 0x21): OBCR ....................................................................................................41

EEPROM Control Register (0x22 – 0x23): EEPCR .......................................................................................................42

Memory BIST Info Register (0x24 – 0x25): MBIR..........................................................................................................42

Global Reset Register (0x26 – 0x27): GRR ...................................................................................................................43

0x28 – 0x29: Reserved...................................................................................................................................................43

Wakeup Frame Control Register (0x2A – 0x2B): WFCR...............................................................................................43

0x2C – 0x2F: Reserved..................................................................................................................................................43

Wakeup Frame 0 CRC0 Register (0x30 – 0x31): WF0CRC0........................................................................................43

Wakeup Frame 0 CRC1 Register (0x32 – 0x33): WF0CRC1........................................................................................44

Wakeup Frame 0 Byte Mask 0 Register (0x34 – 0x35): WF0BM0 ................................................................................44

Wakeup Frame 0 Byte Mask 1 Register (0x36 – 0x37): WF0BM1 ................................................................................44

Wakeup Frame 0 Byte Mask 2 Register (0x38 – 0x39): WF0BM2 ................................................................................44

Wakeup Frame 0 Byte Mask 3 Register (0x3A – 0x3B): WF0BM3................................................................................44

0x3C – 0x3F: Reserved..................................................................................................................................................45

Wakeup Frame 1 CRC0 Register (0x40 – 0x41): WF1CRC0........................................................................................45

Wakeup Frame 1 CRC1 Register (0x42 – 0x43): WF1CRC1........................................................................................45

Wakeup Frame 1 Byte Mask 0 Register (0x44 – 0x45): WF1BM0 ................................................................................45

Wakeup Frame 1 Byte Mask 1 Register (0x46 – 0x47): WF1BM1 ................................................................................45

Wakeup Frame 1 Byte Mask 2 Register (0x48 – 0x49): WF1BM2 ................................................................................45

Wakeup Frame 1 Byte Mask 3 Register (0x4A – 0x4B): WF1BM3................................................................................45

0x4C – 0x4F: Reserved..................................................................................................................................................46

Wakeup Frame 2 CRC0 Register (0x50 – 0x51): WF2CRC0........................................................................................46

Wakeup Frame 2 CRC1 Register (0x52 – 0x53): WF2CRC1........................................................................................46

Wakeup Frame 2 Byte Mask 0 Register (0x54 – 0x55): WF2BM0 ................................................................................46

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Wakeup Frame 2 Byte Mask 1 Register (0x56 – 0x57): WF2BM1 ................................................................................46

Wakeup Frame 2 Byte Mask 2 Register (0x58 – 0x59): WF2BM2 ................................................................................46

Wakeup Frame 2 Byte Mask 3 Register (0x5A – 0x5B): WF2BM3................................................................................47

0x5C – 0x5F: Reserved..................................................................................................................................................47

Wakeup Frame 3 CRC0 Register (0x60 – 0x61): WF3CRC0........................................................................................47

Wakeup Frame 3 CRC1 Register (0x62 – 0x63): WF3CRC1........................................................................................47

Wakeup Frame 3 Byte Mask 0 Register (0x64 – 0x65): WF3BM0 ................................................................................47

Wakeup Frame 3 Byte Mask 1 Register (0x66 – 0x67): WF3BM1 ................................................................................47

Wakeup Frame 3 Byte Mask 2 Register (0x68 – 0x69): WF3BM2 ................................................................................47

Wakeup Frame 3 Byte Mask 3 Register (0x6A – 0x6B): WF3BM3................................................................................48

0x6C – 0x6F: Reserved..................................................................................................................................................48

Transmit Control Register (0x70 – 0x71): TXCR............................................................................................................48

Transmit Status Register (0x72 – 0x73): TXSR .............................................................................................................48

Receive Control Register 1 (0x74 – 0x75): RXCR1 .......................................................................................................49

Receive Control Register 2 (0x76 – 0x77): RXCR2 .......................................................................................................50

TXQ Memory Information Register (0x78 – 0x79): TXMIR ............................................................................................51

0x7A – 0x7B: Reserved..................................................................................................................................................51

Receive Frame Header Status Register (0x7C – 0x7D): RXFHSR ............................................................................... 51

Receive Frame Header Byte Count Register (0x7E – 0x7F): RXFHBCR......................................................................52

TXQ Command Register (0x80 – 0x81): TXQCR ..........................................................................................................52

RXQ Command Register (0x82 – 0x83): RXQCR..........................................................................................................53

TX Frame Data Pointer Register (0x84 – 0x85): TXFDPR.............................................................................................54

RX Frame Data Pointer Register (0x86 – 0x87): RXFDPR............................................................................................54

0x88 – 0x8B: Reserved ..................................................................................................................................................55

RX Duration Timer Threshold Register (0x8C – 0x8D): RXDTTR .................................................................................55

RX Data Byte Count Threshold Register (0x8E – 0x8F): RXDBCTR ............................................................................55

Interrupt Enable Register (0x90 – 0x91): IER ................................................................................................................55

Interrupt Status Register (0x92 – 0x93): ISR .................................................................................................................56

0x94 – 0x9B: Reserved ..................................................................................................................................................57

RX Frame Count & Threshold Register (0x9C – 0x9D): RXFCTR.................................................................................57

TX Next Total Frames Size Register (0x9E – 0x9F): TXNTFSR ...................................................................................57

MAC Address Hash Table Register 0 (0xA0 – 0xA1): MAHTR0....................................................................................58

MAC Address Hash Table Register 1 (0xA2 – 0xA3): MAHTR1....................................................................................58

MAC Address Hash Table Register 2 (0xA4 – 0xA5): MAHTR2....................................................................................58

MAC Address Hash Table Register 3 (0xA6 – 0xA7): MAHTR3....................................................................................58

0xA8 – 0xAF: Reserved..................................................................................................................................................58

Flow Control Low Watermark Register (0xB0 – 0xB1): FCLWR....................................................................................58

Flow Control High Watermark Register (0xB2 – 0xB3): FCHWR...................................................................................59

Flow Control Overrun Watermark Register (0xB4 – 0xB5): FCOWR.............................................................................59

0xB6 – 0xBF: Reserved..................................................................................................................................................59

Chip ID and Enable Register (0xC0 – 0xC1): CIDER .................................................................................................... 59

0xC2 – 0xC5: Reserved .................................................................................................................................................59

Chip Global Control Register (0xC6 – 0xC7): CGCR.....................................................................................................59

Indirect Access Control Register (0xC8 – 0xC9): IACR.................................................................................................59

0xCA – 0xCF: Reserved.................................................................................................................................................60

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Indirect Acces s Data Low Regist er (0xD0 – 0xD1): IADLR ............................................................................................60

Indirect Access Data High Register (0xD2 – 0xD3): IADHR..........................................................................................60

Power Management Event Control Register (0xD4 – 0xD5): PMECR...........................................................................60

Go-Sleep & Wake-Up Time Register (0xD6 – 0xD7): GSWUTR................................................................................... 61

PHY Reset Register (0xD8 – 0xD9): PHYRR ................................................................................................................62

0xDA – 0xDF: Reserved.................................................................................................................................................62

0xE0 – 0xE3: Reserved..................................................................................................................................................62

PHY 1 MII-Register Basic Control Register (0xE4 – 0xE5): P1MBCR...........................................................................62

PHY 1 MII-Register Basic Status Register (0xE6 – 0xE7): P1MBSR ............................................................................63

PHY 1 PHY ID Low Register (0xE8 – 0xE9): PHY1ILR.................................................................................................64

PHY 1 PHY ID High Register (0xEA – 0xEB): PHY1IHR...............................................................................................64

PHY 1 Auto-Negotia tio n Ad vertis ement Register (0xEC – 0xED): P1ANAR................................................................. 64

PHY 1 Auto-Negotiation Link Partner Ability Register (0xEE – 0xEF): P1ANLPR.........................................................64

0xF0 – 0xF3: Reserved ..................................................................................................................................................65

Port 1 PHY Special Control/Status, LinkMD (0xF4 – 0xF5): P1SCLMD........................................................................65

Port 1 Control Register (0xF6 – 0xF7): P1CR................................................................................................................66

Port 1 Status Register (0xF8 – 0xF9): P1SR .................................................................................................................67

0xFA – 0xFF: Reserved..................................................................................................................................................68

MIB (Management Information Base) Counters...............................................................................................................69

Additional MIB Information .............................................................................................................................................70

Absolute Maximum Ratings...............................................................................................................................................71

Operating Ratings...............................................................................................................................................................71

Electrical Characteristics ...................................................................................................................................................71

Timing Specifications.........................................................................................................................................................73

SPI Input and Output Timing ..........................................................................................................................................73

Auto Negotiation Timing .................................................................................................................................................74

Reset Timing...................................................................................................................................................................75

EEPROM Timing ............................................................................................................................................................76

Selection of Isolation Transformers..................................................................................................................................77

Selection of Reference Crystal..........................................................................................................................................77

Package Information...........................................................................................................................................................78

Acronyms and Glossary.....................................................................................................................................................79

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List of Figures

Figure 1. KSZ8851SN L/S N LI Funct ional Dia gram ..................................................................................................................1

Figure 2. 32-Pin (5mm x 5mm) MLF®..................................................................................................................................10

Figure 3. Typica l Straight Cable Connection ........................................................................................................................17

Figure 4. Typical Crossover Cable Connection ....................................................................................................................18

Figure 5. Auto Negot iat ion and Para ll el Operation ...............................................................................................................19

Figure 6. SPI Interface to KSZ8851SNL...............................................................................................................................22

Figure 7. Internal I/O Register Read Timing.........................................................................................................................23

Figure 8. Internal I/O Register Write Timing .........................................................................................................................23

Figure 9. RXQ FIFO Read Timing.........................................................................................................................................24

Figure 10. TXQ FIFO Write Timing.......................................................................................................................................24

Figure 11. Host TX Single Fram e in Manual En que ue Flo w Diagram..................................................................................27

Figure 12. Host TX Multiple Frames in Auto- Enqueue Flow Diagram.................................................................................28

Figure 13. Host RX Single or Multiple Frames in Auto-Dequeue Flow Diagram..................................................................30

Figure 14. PHY Port 1 Near- end (Remote) and Host Far-end (Local) Loopback Paths.......................................................32

Figure 15. SPI Interface Data Input Timing...........................................................................................................................73

Figure 16. SPI Interface Data Output Timing........................................................................................................................73

Figure 17. Auto Negot iat io n Tim ing ......................................................................................................................................74

Figure 18. Reset Tim ing........................................................................................................................................................75

Figure 19. EEPRO M Read C ycle Timing Diagram...............................................................................................................76

Figure 20. 32-Pin (5mm x 5mm) MLF® (QFN per JDEC) Package ......................................................................................78

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List of Tables

Table 1. Internal Func tion Bloc ks Status ..............................................................................................................................13

Table 2. MDI/MDI-X Pin Definitions ......................................................................................................................................17

Table 3. Address Filtering Scheme.......................................................................................................................................21

Table 4. SPI Operation for Registers Access .......................................................................................................................22

Table 5. SPI Operation for TXQ/RXQ FIFO Access.............................................................................................................23

Table 6. Frame Format for Transmit Queue.........................................................................................................................25

Table 7. Transmit Control Word Bit Fields............................................................................................................................25

Table 8. Transmit Byte Count Format...................................................................................................................................25

Table 9. Registers Setting for Transmit Function Block........................................................................................................26

Table 10. Frame Format for Receive Queue........................................................................................................................29

Table 11. Registers Setting for Receive Function Block.......................................................................................................29

Table 12. KSZ8851SNL EEPROM Format...........................................................................................................................31

Table 13. Format of MIB Counters........................................................................................................................................69

Table 14. Port 1 MIB Counters Indirect Memory Offsets......................................................................................................70

Table 15. Electrical Characteristics.......................................................................................................................................72

Table 16. SPI Data Input and Output Timing Parameters ....................................................................................................73

Table 17. Auto Negotiation Timing Parameters....................................................................................................................74

Table 18. Reset Timing Parameters.....................................................................................................................................75

Table 19. EEPROM Timing Parameters...............................................................................................................................76

Table 20. Transformer Selection Criteria....................................................................................... .......................................77

Table 21. Qualified Single Port Magn etic s............................................................................................................................77

Table 22. Typical Reference Crystal Characteristics............................................................................................................77

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Pin Configuration

Figure 2. 32-Pin (5mm x 5mm) MLF®

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Pin Description

Pin Number Pin Name Type Pin Function

1 LED0 Opu

Programmable LED output to indicate PHY activity/status.

LED is ON when output is LOW; LED is OFF when output is HIGH.

LED indicators1 defined as follows:

Chip Global Control Register: CGCR bit [9]

0 (Default) 1

LED1 (pin 32) 100BT ACT

LED0 (pin 1) LINK/ACT LINK

Link (up) = LED On; Activity = LED Blink; Link/Act = LED On/Blink;

Speed = LED On (100BASE-T); LED Off (10BASE-T)

2 PME Opu Power Management Event (default acti ve low)

It is asserted (low or high depends on polarity set in PMECR register) when one of the

wake-on-LAN events is detected by KSZ8851SNL. The KSZ8851SNL is requesting the

system to wake up from low power mode.

3 INTRN Opu Interrupt Not

An active low signal to host CPU to indicate an interrupt status bit is set. This pin needs

an external 4.7K pull-up resistor.

4 DGND Gnd Digital IO ground.

5 VDD_CO1.8 P 1.8V regulator output . This 1.8V output pin provides power to pins 9 (VDD_A1.8) and 23

(VDD_D1.8) for core VDD supply.

If VDD_IO is set for 1.8V then this pin should be left floating, pins 9 (VDDA_1.8) and 23

(VDD_D1.8) will be sourced by the external 1.8V supply that is tied to pins 25 and 30

(VDD_IO) with appropriate filtering.

6 EED_IO Ipd/O In/Out Data from/to external EEPROM

Config Mode: The pull-up/pull-down value is latched as with/without EEPRO M during

power-up / reset. See “Strapping Options” section for details.

7 EESK Opd EEPROM Serial Clock

A 4μs (OBCR[1:0]=11 on-chip bus speed @ 25MHz) or 800ns (OBCR[1:0]=00 on-chip

bus speed @ 125 MHz) serial output clock to load configuration data from the serial

EEPROM.

8 AGND Gnd Analog ground.

9 VDD_A1.8 P 1.8V analog power supply from VDD_CO1.8 (pin 5) with appropria te filtering. If VDD_IO is

1.8V, this pin must be supplied power from the same source as pins 25 and 30 (VDD_IO)

with appropriate filtering.

10 EECS Opd EEPROM Chip Select

This signal is used to select an external EEPROM device.

11 RXP I/O Physical receive (MDI) or transmit (MDIX) signal (+ differential).

12 RXM I/O Physical receive (MDI) or transmit (MDIX) signal (– differe ntial).

13 AGND Gnd Analog ground.

14 TXP I/O Physical transmit (MDI) or receive (MDIX) signal (+ differentia l).

15 TXM I/O Physical transmit (MDI) or receive (MDIX) signal (– differential).

16 VDD_A3.3 P 3.3V analog VDD input power supply with well decoupling capacitors.

17 ISET O Set physical transmits output current.

Pull-down this pin with a 3.01K 1% resistor to ground.

18 AGND Gnd Analog ground.

19 RSTN Ipu Reset Not.

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Pin Number Pin Name Type Pin Function

Hardware reset pin (active Low). This reset input must be held low for a minimum of 10ms

after stable supply voltag e 3.3 V .

20 X1 I

21 X2 O

25MHz crystal or oscillator clock connection.

Pins (X1, X2) connect to a crystal. If an oscillator is used, X1 connects to a 3.3V tolerant

oscillator and X2 is a no connec t.

Note: Clock requirement is +/- 50ppm for either crystal or oscillator.

22 DGND Gnd Digital IO ground

23 VDD_D1.8 P 1.8V digital power supply from VDD_CO1.8 (pin 5) with appropriate filtering. If VDD_IO is

1.8V, this pin must be supplied power from the same source as pins 25 and 30 (VDD_IO)

with appropriate filtering.

24 DGND Gnd Digital IO ground

25 VDD_IO P 3.3V, 2.5V or 1.8V digital VDD input power supply for IO with well decoupling capacitors.

26 CSN Ipu SPI slave mode: Chip Select Not

Active low input pin for SPI interface.

27 SO O SPI slave mode: Serial data out for SPI interface. This SO is tri-stated output when CSN

is negated and this pin must have external 4.7K pull-up to keep the SO line high while the

driver is tri-stated.

28 SCLK I SPI slave mode: Serial clock input for SPI interface. This clock speed can run up to

40MHz.

29 DGND Gnd Digital IO ground

30 VDD_IO P 3.3V, 2.5V or 1.8V digital VDD input power supply for IO with well decoupling capacitors.

31 SI Ipd SPI slave mode: Serial data in for SPI interface.

32 LED1 Opu Programmable LED1 output to indicate PHY activity/status (see LED0 description at pin1)

Legend:

P = Power supply Gnd = Ground

I/O = Bi-directional I = Input O = Output.

Ipd = Input with internal pull-down (58K +/-30%).

Ipu = Input with internal pull-up (58K +/-30%).

Opd = Output with internal pull-down (58K +/-30%).

Opu = Output with internal pull-up (58K +/-30%).

Ipu/O = Input with internal pull-up (58K +/-30%) during power-up/res et; output pin otherwise.

Ipd/O = Input with internal pull-down (58K +/-30%) during power-up/res et ; out put pin otherwise.

Strapping Options

Pin Number Pin Name Type Pin Function

6 EED_IO Ipd/O EEPROM select:

Pull-up = EEPROM present

Floating (NC) or Pull-down = EEPROM not present (default)

During power-up / reset, this pin value is latched into register CCR, bit 9

Note: Ipd/O = Input with internal pull-down (58K +/-30%) during power-up/reset; output pin otherwise.

Pin strap-in s are l atc hed during power-up or reset.

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August 2009 13 M9999-083109-2.0

Functional Description

The KSZ8851SNL is a single-chip Fast Ethernet MAC/PHY controller consisting of a 10/100 physical layer transceiver

(PHY), a MAC, and an indu str y standard Ser ial Periph eral Inter fac e (SPI) . T he h ost CPU is via SPI int erf ace to rea d/ write

KSZ8851SNL internal registers either byte (8-bit), word (16-bit) or double word (32-bit) and to access KSZ8851SNL

RXQ/TXQ FIFOs for packet receive/transmit.

The KSZ8851SNL is fully compliant to IEEE802.3u standards.

Functional Overview

Power Management

The KSZ8851SNL supports enhanced power management feature in low power state with energy detection to ensure low-

power dissipation during device idle periods. There are four operation modes under the power management function

which is controlled by two bits in PMECR (0xD4) register as shown below:

PMECR[1: 0] = 00 Norm al O per ation Mod e

PMECR[1:0] = 01 Energy Detect Mode

PMECR[1:0] = 10 Soft Power Down Mode

PMECR[1 :0] = 11 Po wer S aving Mo de

Table 1 indicates all internal function blocks status under four different power management operation modes.

Power Management Operation Modes KSZ8851SNL

Function Blocks Normal mode Power saving mode Energy detect mode Soft power down mode

Internal PLL Clock Enabled Enabled Disabled Disabled

Tx/Rx PHY Enabled Rx unused block disabled Energy detect at Rx Disabled

MAC Enabled Enabled Disabled Disabled

SPI Interface Enabled Enabled Disabled Disabled

Table 1. Internal Function Blocks Status

Normal Operation Mode

This is the default setting bit[1:0]=00 in PMECR register after the chip power-up or hardware reset (pin 67). When

KSZ8851SN L is in this nor m al operation mode, all PLL clocks are running, PH Y and MAC are on and the h ost interface is

ready for CPU read or write.

During the normal operation mode, the host CPU can set the bit[1:0] in PMECR register to transit the current normal

operation mode to any one of the other three power management operation modes.

Energy Detect Mode

The energy detect mode provides a mechanism to save more power than in the normal operation mode when the

KSZ8851SNL is not connected to an active link partner. For example, if cable is not present or it is connected to a

powered down partner, the KSZ8851SNL can automatically enter to the low power state in energy detect mode. Once

activity resum es due t o p lu ggi ng a cable or att empting b y the f ar end to es t ab lis h link, the K SZ 88 51 SNL ca n autom atic all y

power up to normal power state in energy detect mode.

Energy detect mode consists of two states, normal power state and low power state. While in low power state, the

KSZ8851 SNL reduces po wer consum ption by disab ling all circ uitry except the en ergy detect circ uitry of the rec eiver. The

energy detect mode is entered by setting bit[1:0]=01 in PMECR register. When the KSZ8851SNL is in this mode, it will

monitor the cable energy. If there is no energy on the cable for a time longer than pre-configured value at bit[7:0] Go-

Sleep time in G SWUT R r egister , K SZ8851SNL will go into a lo w po wer s tat e. When KSZ8851SN L is in lo w power st at e, it

will keep monitoring the cable energy. Once the energy is detected from the cable and is continuously presented for a

time longer than pre-configured value at bit[15:8] W ake-Up time in GSW UTR register, the KSZ8851SNL will enter either

the normal power state if the auto-wakeup enable bit[7] is set in PMECR register or the normal operation mode if both

auto-wak eup ena bl e bit[7] and wak eup to normal operatio n m ode bit[6] are set in PM ECR regis ter .

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The KSZ8851SNL will also assert PME output pin if the corresponding enable bit[8] is set in PMECR (0xD4) register or

generate in ter rupt to s ig na l an energy detect eve nt oc c urr ed if the c orr es pondin g e nab le bit [2] is s et in IER (0x90) regis ter .

Once the po wer management un it detects the PME o utput asserted or interrupt ac tive, it will power up th e host CPU and

issue a wakeup command which is any one of registers read or write access to wake up the KSZ8851SNL from the low

power stat e to the n orm al po wer state in case t he a uto-wak eup enab le bit[ 7] is d is abled. When KSZ8 851SNL is at nor m al

power state, it is able to transmit or receive packet from the cable.

Soft Power Down Mode

The soft power down mode is entered by setting bit[1:0]=10 in PMECR register. When KSZ8851SNL is in this mode, all

PLL cloc ks are disable d, the PHY an d the MAC are of f, all intern al registers v alue will not c hange, and the host interf ace

is only used to wake-up this device from current soft power down mode to normal operation mode.

In order to go back the normal operation mode from this soft power down mode, the only way to leave this mode is

through a host wake-up command which the CPU issues any one of registers read or write access.

Power Saving Mode

The power saving mode is entered when auto-negotiation mode is enabled, cable is disconnected, and by setting

bit[1:0]=1 1 in PMECR register and bit [10]=1 in P1S CL MD register. When KSZ885 1SNL is in this m ode, all PLL clocks are

enabled, M AC is on, all internal r egisters value will not change, and host interface is ready for CPU read or write. In this

mode, it mainly controls the PHY transceiver on or off based on line status to achieve power saving. The PHY remains

transm itting and on ly turns off the unused r eceiver b lock. Once activi ty resum es due to plugg ing a cab le or attempting by

the far end to establish link, the KSZ8851SNL can automatically enabled the PHY power up to normal power state from

power saving mode.

During this p ower savin g mode, the hos t CPU can pr ogram the bit[1:0] in PMECR r egister and s et bit[10]=0 in P1SCLMD

Wake-on-LAN

Wake-up frame events are used to wake the system whenever meaningful data is presented to the system over the

network. Examples of meaningful data include the reception of a Magic Packet, a management request from a remote

adminis trator, or sim ply network tr affic dir ectly target ed to the loc al s ystem. In all o f thes e instanc es, the networ k device is

pre-programmed by the policy owner or other software with information on how to identify wake frames from other network

traffic. The KSZ8851SNL controller can be programmed to notify the host of the wake-up frame detection with the

assertion of the interrupt signal (INTRN) or assertion of the power management event signal (PME).

A wake-up event is a request for hardware and/or software external to the network device to put the system into a

powered state (working).

A wake-up signal is caused by:

1. Detection of energy signal over a pre-configured value (bit 2 in ISR register)

2. Detection of a linkup in the network link state (bit 3 in ISR register)

3. Receipt of a Magic Packet (bit 4 in ISR register)

4. Receipt of a network wake-up frame (bit 5 in ISR register)

There ar e als o oth er types of wak e- up e ve nts tha t are not lis te d here as manufac tur ers m a y choose to implement these in

their own wa y.

Detection of Energy

The energy is detected from the cable and is continuously presented for a time longer than pre-configured value,

especially when this energy change may impact the level at which the system should re-enter to the normal power state.

Detection of Linkup

Link status wake events are useful to indicate a linkup in the network’s connectivity status.

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August 2009 15 M9999-083109-2.0

Wake-up Packet

Wake-up packets are certain types of packets with specific CRC values that a system recognizes as a ‘wake up’ frame.

The KSZ8851SNL supports up to four users defined wake-up frames as below:

1. Wake-up fram e 0 is defined in wakeup frame registers (0x30 – 0x3B) a nd is enabled by bit 0 in wak eup frame control

2. Wake-up fram e 1 is defined in wakeup frame registers (0x40 – 0x4B) a nd is enabled by bit 1 in wak eup frame control

3. Wake-up fram e 2 is defined in wakeup frame registers (0x50 – 0x5B) a nd is enabled by bit 2 in wak eup frame control

4. Wake-up fram e 3 is defined in wakeup frame registers (0x60 – 0x6B) a nd is enabled by bit 3 in wak eup frame control

Magic Packet

Magic Packet technology is used to remotely wake up a sleeping or powered off PC on a LAN. This is accom plished by

sending a specific packet of inf ormation, called a Magic Packet frame, to a node on th e network. W hen a PC capable of

receivin g the spec if ic f r am e goes to sleep, it e na bles th e Ma gic Packet RX mode in th e L AN c o ntr o ller, and when the L AN

controller receives a Magic Packet frame, it will alert the system to wake up.

Magic Pac k et is a s tand ar d f eatur e integrated i nto the KSZ8851 SNL. The c ontr o ll er implements m ultipl e a dvanc ed po wer -

down modes including Magic Packet to conserve power and operate more efficiently.

Once the KSZ8851SNL has been put into Magic Packet Enable mode (WFCR[7]=1), it scans all incoming frames

addressed to the node for a specific data sequence, which indicates to the controller this is a Magic Packet (MP) frame.

A Magic Packet frame must also meet the basic requirements for the LAN technology chosen, such as Source Address

(SA), Destination Address (DA), which may be the receiving station’s IEEE address or a multicast or broadcast address

and CRC.

The specific sequence consists of 16 duplications of the IE EE address of this node, with no break s or interruptions. This

sequence can be located anywhere within the packet, but must be preceded by a synchronization stream. The

synchron ization stream allows th e scanning s tate machin e to be muc h simpler. T he synchroniza tion stream is define d as

6 bytes of FFh. The device will a lso accept a broa dcast fram e, as long as the 16 duplicati ons of the IEEE a ddress match

the address of the machine to be awakened.

Example:

If the IEEE address for a particular node on a network is 11h 22h, 33h, 44h, 55h, 66h, the LAN controller would be

scanning for the data sequence (assuming an Ethernet frame):

DESTINAT ION SOURCE – MI SC - FF FF FF FF FF FF - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -

11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 - 11 22 33 44 55 66 -

11 22 33 44 55 66 - MISC - CRC.

There ar e no fur ther restric tions on a Magic Pack et fram e. For instance, the sequ ence could be in a TCP/IP pack et or an

IPX pack et. The fr ame m ay be bridged or routed acr oss the net work without af fecting its a bility to wak e-up a node at th e

frame’s destination.

If the LAN contr oll er sc ans a fr ame and does not find t he specif ic s equence s how n above, it disc ards the f ram e and tak es

no further action. If the KSZ8851SNL controller detects the data sequence, however, it then alerts the PC’s power

management circuitry (assert the PME pin) to wake up the system.

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Physical Layer Transceiver (PHY)

100BA SE-TX Transmi t

The 100BASE-T X transmit function performs parallel-to-serial conversion, 4B/5B coding, scrambling, NRZ-to-NRZI conversion,

and ML T3 encodin g a nd t ransmissi on .

The circuitry starts with a parallel-to-serial conversion, which converts the MII data from the MAC into a 125MHz serial bit

strea m. The data and con trol st re am i s then conve rted into 4B/5B co ding , follow ed by a scramble r. Th e se rializ ed data is fu rthe r

converted from NRZ-to-NRZI format, and then transmitted in MLT3 current output. An external 3.01kΩ (1%) resistor is

connected to pin 17 (ISET) fo r the 1: 1 transfo rmer ratio sets the outp ut cur rent.

The output signal has a typical rise/fall time of 4ns and complies with the ANSI TP-PMD standard regarding amplitude balance,

ove rshoot , and timing ji tte r. Th e wave -shape d 10BASE -T outp ut d river i s al so in co rporated in to the 100B ASE -TX drive r.

100BASE-TX Receive

The 1 00BA SE-TX r eceiver functio n perf orms ad aptive equal izatio n, DC r estor ation, MLT3-t o-NRZI conver sion, d ata and c lock

recove ry, NRZI-to -NRZ conver sion, de -scrambling, 4B/ 5B decodin g, and serial -to-pa rallel conversi on.

The rec e i v i n g sid e st ar ts wit h th e e qu a l i zation fi lt er t o c o mpensa t e for inter-symbo l in ter f e r e nc e (IS I) o v er th e t wisted p ai r cable.

Sinc e the amplit ude loss and phase d istort ion is a funct ion of the ca ble length , the equ alizer has to adj ust its c haract eristic s to

optimize performance. In this design, the variable equalizer makes an initial estimation based on comparisons of incoming

signal strength against some known cable characteristics, and then tunes itself for optimization. This is an ongoing process and

self-adjusts against environmental changes such as temperature variations.

Next, the equalized signal goes through a DC restoration and data conversion block. The DC restoration circuit is used to

compensate for the effect of baseline wander and to improve the dynamic range. The differential data conversion circuit

converts the MLT3 format back to NRZI. The slicing threshold is also adaptive.

The c lock rec over y circu it extrac ts the 125MHz clock f rom th e edges of the NRZI si gnal. T his rec overed c lock i s then used to

convert the NRZI signal into the NRZ format. This signal is sent through the de-scrambler followed by the 4B/5B decoder.

Finally , the NRZ serial dat a is converted to an MII for mat and provid ed as the inpu t data to the MAC.

PL L Cloc k Sy nt hes ize r (R ec o very )

The i ntern al PLL c lock s ynthesi zer can gener ate e ither 125M Hz, 62 .5MH z, 41. 66MH z, or 25 MHz c lock s by set ting t he on-c hip

bus cont rol regi ste r (0x20 ) for KS Z8 851S NL sy ste m ti ming . Thes e inte rnal cl o cks a re gene ra te d fro m an exte rn al 25MHz crys tal

or oscillator.

Scramb ler/D e-scram bler (10 0BASE- TX only)

The purpose of the scrambler is to spread the power spectrum of the signal to reduce electromagnetic interference (EMI) and

baseli ne w ande r .

Transmitted data is scrambled through the use of an 11-bit wide linear feedback shift register (LFSR). The scrambler generates

a 204 7-b it non-r e pet iti ve s eque nc e. T he n th e rec e iver de -sc ram bles th e i nc om ing da t a str eam us in g th e s am e sequ enc e as a t

the transmitter.

10BASE-T Transmit

The 10BASE-T driver is incorporated with the 100BASE-TX driver to allow for transmission using the same magnetics. They

are internally wave-shaped and pre-emphasized into outputs with typical 2.4V amplitude. The harmonic contents are at least

27dB bel ow th e fun da ment al fre que n cy w hen d riven by an all-ones Ma n cheste r -en coded sign al.

10BASE-T Receive

On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver circuit and a

phase-locked loop (PLL) perform the decoding function.

The Manchester-encoded data stream is separated into clock signal and NRZ data. A squelc h circuit rejects signals with levels

less than 400mV or with short pulse widths to prevent noise at the RXP or RXM input from falsely triggering the decoder. When

the input exceeds the squelch limit, the PLL locks onto the incoming signal and the KSZ8851SNL dec odes a data frame. The

receiver clock is maintained active during idle periods in between data reception.

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MDI/MDI-X Auto Crossover

To elim inate the need f or cros sover cab les between sim ilar devic es, the KSZ885 1SNL sup ports HP- Auto M DI/MDI-X a nd

IEEE 802.3u standard MDI/MDI-X auto crossover. HP-Auto MDI/MDI-X is the default.

The auto-s ens e f unc tio n de tect s r em ote trans mit and recei ve pa irs and c orr ec tly assigns the tr ansmit and receive pair s f or

the KSZ8851SNL device. This feature is extremely useful when end users are unaware of cable types in addition to

saving on an additional uplink configuration connection. The auto-crossover feature can be disabled through the port

control registers. The IEEE 802.3u standard MDI and MDI-X definitions are as below:

MDI MDI-X

RJ45 Pins Signals RJ45 Pins Signals

1 TD+ 1 RD+

2 TD- 2 RD-

3 RD+ 3 TD+

6 RD- 6 TD-

Table 2. MDI/MDI-X Pin Definitions

Straight Cable

A straig ht cable c onnec ts an MDI dev ice to a n MDI-X dev ice or an MDI-X dev ice to an MDI de vice. T he foll owing dia gram

shows a typical straight cable connection between a network interface card (NIC) and a switch, or hub (MDI-X).

Figure 3. Typical Straight Cable Connection

Crossover Cab le

A crossover cable connects an MDI device to another MDI device, or an MDI-X device to another MDI-X device. The

following diagram shows a typical crossover cable connection between two chips or hubs (two MDI-X devices).

Receive PairTransmit Pair

Receive Pair

Transmit Pair

Modular Connector

(RJ-45)

NIC

Straight

Cable

10/100 Ethernet

Media Dependent Interface 10/100 Ethernet

Media Dependent Interface

Modular Connector

(RJ-45)

HUB

(Repeater or Switch)

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Figure 4. Typical Crossover Cable Connection

Auto Negotiation

The KSZ8851SNL conforms to the auto negotiation protocol as described by the 802.3 committee to allow the port to

operate at either 10Base-T or 100Base-TX.

Auto negot iation a llows u nshielded twis ted pair ( UTP) li nk partners to sele ct the bes t comm on mode of oper ation. In a uto

negotiat ion, th e link partners advert ise capab ilit ies acr oss the link to eac h other . If auto negot iatio n is not su pporte d or the

link partner to the KSZ8851SNL is forced to bypass auto negotiation, the mode is set by observing the signal at the

receiver. This is known as parallel mode because while the transmitter is sending auto negotiation advertisements, the

receiver is listening for advertisements or a fixed signal protocol.

The link setup is shown in the following flow diagram (Figure 5).

Receive Pair Receive Pair

Transmit Pair

10/100 Ethernet

Media Dependent Interface 10/100 Ethernet

Media Dependent Interface

Modular Connector (RJ-45)

HUB

(Repeater or Switch)

Modular Connector (RJ-45)

HUB

(Repeater or Switch)

Crossover

Cable

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Force Link Setting

Listen for 10BASE-T L i n k

Pulse s

Listen for 100BASE-TX

Idles

ttempt Auto

Negotiation

Link Mode Set

B y p a s s

u t o N e g o t i a t i o n

and Set Link Mode

Link Mode Set ?

Parallel

Operation

Join Flow

YES

Start Auto Negotiation

Figure 5. Auto Negotiation and Parallel Operation

LinkMD® Cable Diagnostics

The KSZ8851SNL LinkMD® uses time domain reflectometry (TDR) to analyze the cabling plant for common cabling

problems such as open circuits, short circuits, and impedance mismatches.

LinkMD® works by sending a pulse of known amplitude and duration down the MDI and MDI-X pairs and then analyzes

the shape of the reflected signal. Timing the pulse duration gives an indication of the distance to the cabling fault with a

maximum distance of 200m and an accuracy of ±2m. Internal circuitry displays the TDR information in a user-readable

digital format in register P1SCLMD[8:0].

Note: cable diagnostics are only valid for copper connections – fiber-optic operation is not supported.

Access

LinkMD® is initiated by accessing register P1SCLMD, the PHY special control/status and LinkMD® register (0xF4).

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Usage

LinkMD® can be run at any time by ensuring that Auto-MDIX has been disabled. To disable Auto-MDIX, write a ‘1’ to

P1CR[10] to enable manual control over the pair used to transmit the LinkMD® pulse. The self-clearing cable diagnostic

test enable bit, P1SCLMD [12], is set to ‘1’ to start the test on this pair.

When bit P1SCLMD[12] returns to ‘0’, the test is complete. The test result is returned in bits P1SCLMD[14:13] and the

distance is returned in bits P1SCLMD[8:0]. The cable diagnostic test results are as follows:

00 = Valid test, normal condition

01 = Valid test, open circuit in cable

10 = Valid test, short circuit in cable

11 = Invalid test, LinkMD® failed

If P1SCLMD[14:13] =11, this indicates an invalid test, and occurs when the KSZ8851SNL is unable to shut down the link

partner. In t his insta nce, t he tes t is not run, as i t is not pos sible f or th e KSZ8 851S NL to det erm ine if the det ec ted sig nal is

a reflection of the signal generated or a signal from another source.

Cable distance can be approximated by the following formula:

P1SCLMD[8:0] x 0.4m for port 1 cable distance

This constant m ay be calibrated f or diff erent cabling c onditi ons, inclu ding cab les with a v elocity of propagati on that varies

significantly from the norm.

Media Access Control (MAC) Operation

The KSZ8851SNL strictly abides by IEEE 802.3 standards to maximize compatibility.

Inter Packet Gap (IPG)

If a frame is successfully transmitted, then the minimum 96-bit time for IPG is measured between two consecutive

packets. If the current packet is experiencing collisions, the m inimum 96-bit time for IPG is m easured from carrier sense

(CRS) to the next transmit packet.

Back-Off Algorithm

The KSZ8851SNL implements the IEEE standard 802.3 binary exponential back-off algorithm in half-duplex mode. After

16 collisions, the packet is dropped.

Late Collision

If a transmit packet experiences collisions after 512 bit times of the transmission, the packet is dropped.

Flow Control

The KSZ8851SNL supports standard 802.3x flow control frames on both transmit and receive sides.

On the receive side, if the KSZ8851SNL receives a pause control frame, the KSZ8851SNL will not transmit the next

normal frame until the timer, specified in the pause control frame, expires. If another pause frame is received before the

current tim er expires , the timer will be updated with the new valu e in the second pause f rame. During this period (while it

is flow controlled), only flow control packets from the KSZ8851SNL are transmitted.

On the transmit side, the KSZ8851SNL has intelligent and efficient ways to determine when to invoke flow control. The

flow control is based on availability of the system resources.

There are three programmable low watermark register FCLWR (0xB0), high watermark register FCHWR (0xB2) and

overrun watermark register FCOWR (0xB4) for flow control in RXQ FIFO. The KSZ8851SNL will send PAUSE frame

when the RX Q buffer hit the high waterm ark level ( default 3.0 72 KByte a vailable) and s top PAUS E frame when t he RXQ

buff er hit the low wat ermark level (defau lt 5.12 KB yte availab le). The KSZ 8851S NL will drop pac ket when t he RXQ buf fer

hit the overrun watermark level (default 256-Byte available).

The KSZ8851SNL issues a flow control frame (Xoff, or transmitter off), containing the maximum pause time defined in

IEEE sta ndard 802.3x. Once the r esour c e is f reed up , the KSZ8 851 SNL sen ds out the ano ther flow c ontro l f r ame (Xon, or

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transmitter on) with zero pause time to turn off the flow control (turn on transmission to the port). A hysteresis feature is

provided to prevent the flow control mechanism from being constantly activated and deactivated.

Half-Duplex Backpressure

A half-duplex backpressure option (non-IEEE 802.3 standards) is also provided. The activation and deactivation

conditions are the sam e as in full-duplex mode. If backpressure is required, the KSZ8851SNL sends preambles to defer

the other stations' transmission (carrier sense deference).

To avoid jabber and excessive deference (as defined in the 802.3 standard), after a certain time, the KSZ8851SNL

discontinues the carrier sense and then raises it again quickly. This short silent time (no carrier sense) prevents other

stations from sending out pack ets thus keepin g other statio ns in a carr ier sense def erred state. If the port has packets to

send during a backpressure situation, the carrier sense type backpressure is interrupted and those packets are

transmitted instead. If there are no additional packets to send, carrier sense type backpressure is reactivated again until

chip resources free up. If a collision occurs, the binary exponential back-off algorithm is skipped and carrier sense is

generated immediately, thus reducing the chance of further collision and carrier sense is maintained to prevent packet

reception.

Address Filtering Function

The KSZ8851SNL supports 11 different address filtering schemes as shown in the following Table 3. The Ethernet

destination address (DA) field inside the packet is the first 6-byte field which uses to compare with either the host MAC

address registers (0x10 – 0x15) or the MAC address hash table registers (0xA0 – 0xA7) for address filtering operation.

The f irst bit ( bit 40) of the des tinatio n addr ess ( DA) in the E thernet p ack et dec ides whether th is is a ph ysica l addr ess if bit

40 is “0” or a multicast address if bit 40 is “1”.

Receive Control Register (0x74 – 0x75): RXCR1

Item Address Fil teri ng

Mode RX All

(Bit 4) RX Inverse

(Bit 1)

RX Physical

Address

(Bit 11)

RX Multicast

Address

(Bit 8)

Description

1 Perfect 0 0 1 1 All Rx frames are passed only if the DA exact l y matc hes the

MAC address in MARL, MARM and MARH registers .

2 Inverse perfect 0 1 1 1 All Rx frames are passed if the DA is not matching the MAC

address in MARL, MARM and MARH registers.

3 Hash only 0 0 0 0 All Rx frames with either mu lticast or physical destination

address are filteri ng agai nst the MAC address hash table.

4 Inverse hash only 0 1 0 0

All Rx frames with either mu lticast or physical destination

address are filteri ng not against the MAC address hash table.

All Rx frames which are filteri ng out at it em 3 (Hash only) onl y

are passed in this mode.

5 Hash perfect

(Default) 0 0 1 0

All Rx frames are passed with Physical address (DA) matching

the MAC address and to enable receive multicast frames that

pass the hash table when Multicast address is matc hi ng the

MAC address hash table.

6 I nverse hash

perfect 0 1 1 0 All Rx frames which are filtering out at item 5 (Hash perfect) only

are passed in this mode.

7 Promiscuous 1 1 0 0 All Rx frames are pass ed without any condit i ons.

8 Hash only with

Multic ast address

passed 1 0 0 0 Al l Rx frames are passed with P hysical address (DA) matching

the MAC address hash table and with Multicast address without

any conditi ons.

9 Perfect with

Multic ast address

passed 1 0 1 1 Al l Rx frames are passed with P hysical address (DA) matching

the MAC address and with Multicas t addres s without any

conditions.

10 Hash only with

Physical address

passed 1 0 1 0 Al l Rx frames are pass ed with Multicast address matching the

MAC address hash table and with Physical address wit hout any

conditions.

11 Perfect with

Physical address

passed 1 0 0 1 Al l Rx frames are pass ed with Multicast address matching the

MAC address and with Physic al address without any c onditi ons.

Note 1: Bit 0 (RX Enable), Bit 5 (RX Unicast Enable) and Bit 6 (RX Multicast Enable) must s et to 1 in RXCR1 register.

Note 2: The KSZ8851SNL will discard frame with SA same as the MAC address if bit[0] is set in RXCR 2 register.

Table 3. Address Filtering Scheme

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Clock Generator

The X1 and X2 pins are connected to a 25MHz crystal. X1 can also serve as the connector to a 3.3V, 25MHz oscillator

(as descr ibed in the pin d esc r iptio n).

Serial Peripheral Interface (SPI)

The KSZ8 851 SNL s upport s a S PI int erf ace in slave mode. In this m ode, a exter nal SPI m as ter devic e (m icro-c ontroller or

CPU) supplies the operating serial clock (SCLK), chip select (CSN) and serial input data (SI) which is clocked in on the

rising edge of SCL K to K SZ8851SN L de vic e. Ser ial output dat a ( SO) is driv en ou t b y the KSZ 885 1S NL on the f alling edg e

of SCLK to exter nal SPI master device. The f alling edge of CSN is starting the SPI oper ation and the risin g edge of CSN

is ending the SPI operation. The SCLK stays low state when SPI operation is idle. Figure 6 shows the SPI interface

connection for KSZ8851SNL.

Figure 6. SPI Interface to KSZ8851SNL

There are four SPI operations depending on the opcode inside the command phase:

• Internal I/O registers read (opcode = 00)

• Internal I/O registers write (opcode = 01)

• RXQ FIFO read to receive packet (opcode = 10)

• TXQ FIFO write to transmit packet (opcode = 11)

As sho wn in Tab le 4 and 5 , there are t wo phases in each SPI operation, the first is comm and phase and the follo wing is

data phase. Command phase is two bytes long for internal I/O registers access and one byte long for TXQ/RXQ FIFOs

access. Data phase on internal I/O registers access is in the range of one to four bytes long depending on the specified

byte enable bits B[3:0] in command phase, and data phase on TXQ or RXQ FIFOs access is limited up to 6 Kbytes for

TXQ access or 12 Kbytes for RXQ access.

Command Phase (SI pin)

Byte 0 [7:0] Byte 1 [7:0]

SPI

Operation Opcode Byte enable Register Address Don’t car e bits

Data Phase

(SO or SI pins)

Internal I/O

(read data on SO pin)

Internal I/O

(write data on SI pin)

Note: In Command phase, A[7:2] access register address location in double word and B[3:0] enable which byte to

access during read or write. In Data phase, the byte 0 is first in/out and byte 3 is last in/out during read or write.

B[3:0] -> 1: enable byte, 0: disable byte.

Table 4. SPI Operation for Registers Access

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Command Phase (SI pin)

Byte 0 [7:0]

SPI Operation

Opcode Don’t care bits

Data Phase

(SO or SI pins)

RXQ FIFO Read

(12 KByte) 1 0 X X X X X X 1 to 12 KBytes

(DMA read data on SO pin)

TXQ FIFO Write

(6 KByte) 1 1 X X X X X X 1 to 6 KBytes

(DMA write data on SI pin)

Note: The Start DMA Access bit 3 in RXQCR register must set to “1” before FIFO

read/write commands. This bit must be clear to “0” when DMA operation is finished.

Table 5. SPI Operation for TXQ/RXQ FIFO Access

SPI Internal I/O Registers Access Operation Timing

As sho wn in F igur es 7 a nd 8 il lust rat e the S PI in ter na l I /O regis ter s r ead and wr ite oper at io n timing, the f irs t two c om m and

byte 0/1 contain opcode (00: read command, 01: write command), B[3:0] Byte enable bits to indicate which data byte is

availab le in da ta phase ( 1: byte e nable, 0: byte d isable) an d A[7:2] address b its to acc ess reg ister locati on. T he follo wing

is data phase either 1, 2, 3, or 4 bytes depending on B[3:0] setting.

Figure 7. Internal I/O Register Read Timing

Figure 8. Internal I/O Register Write Timing

SPI TXQ/RXQ FIFOs Access Operation Timing

As sho wn in Figur es 9 an d 10 illus trate th e SPI T XQ/RXQ FIFOs writ e and re ad opera tion tim ing, the f irst com mand b yte

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0 contains only opcode (10: read command, 11: write command) and the following is read/write data phase.

Figure 9. RXQ FIFO Read Timing

Figure 10. TXQ FIFO Write Timing

Queue Management Unit (QMU)

The Queue Man agem ent Unit (Q MU) m anages pack et traff ic between the MA C/PH Y interfac e and the s ystem hos t. It has

built-in pac ket m emory for rec eive and trans mit f unctions c alled TX Q (Transm it Queue) and RX Q (Recei ve Queue). Each

queue cont ains 12KB f or RXQ and 6 KB for TX Q of memor y with back -to-back, non- blocking f ram e transfer perf orm ance.

It provides a gr o up of c ontr ol r e gis ters f or system c ont r ol, f rame st atus r egis t ers f or cur r ent packet trans mit/recei ve sta t us,

and interrupts to inform the host of the real time TX/RX status.

Transmit Queue (TXQ) Frame Format

The fram e format for the tr ansmit queue is sho wn in the follo wing Table 6. T he first word cont ains the contr ol inform ation

SCLK

CSN

10XXXXXXXXXXXXXX

D7 D6 D5 D4 D3 D2 D1 D0

RXQ Read Command Byte 0 Read Data Byte 1 Read Data Byte 2

XXXXXXXXXXXXXXXX

Read Data Byte 3 Read Data Byte 4 Read Data Byte N

XXXXXXXX

D7 D6 D5 D4 D3 D2 D1 D0

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

SCLK

CSN

D7 D6 D5 D4 D3 D2 D1 D0

High Impedance

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for the frame to transmit. The second word is used to specify the total number of bytes of the frame. The packet data

follows. The packet data area holds the frame itself. It may or may not include the CRC checksum depending upon

whether hardware CRC checksum generation is enabled in TXCR (bit 1) register.

Multiple frames can be pipelined in both the transmit queue and receive queue as long as there is enough queue memory,

thus avoiding overrun. For each transmitted frame, the transmit status information for the frame is located in the TXSR

(0x72) register.

Packet Memory

Address Offset Bit 15 Bit 0

2nd Byte 1st Byte

0 Control Word

2 Byte Count

4 - up Transmit Packet Data

(maximum size is 2000)

Table 6. Frame Format for Transmit Queue

Since multiple packets can be pipelined int o the TX packet memory for transm it, the transmit status reflects the status of

the packet that is currently being transferred on the MAC interface, which may or may not be the last queued packet in the

TX queue.

The transmit control word is the first 16-bit word in the TX packet memory, followed by a 16-bit byte count. It must be word

aligned. Each control word corresponds to one TX packet. Table 7 gives the transmit control word bit fields.

Bit Description

15 TXIC Transmit Interrupt on Completion

When this bit is set, the KSZ8851SNL sets the transmit interrupt after the pres ent frame has

been transmitted.

14-6 Reserved.

5-0 TXFID Transmit Frame ID

This field specifies the frame ID that is used to identify the frame and its associated status

information in the transmit status register.

Table 7. Transmit Control Word Bit Fields

The transmit Byte Count specifies the total number of bytes to be transmitted from the TXQ. Its format is given in Table 8.

Bit Description

15-11 Reserved.

10-0 TXBC Transmit Byte Count

Transmit Byte Count. Hardware uses the byte count information to conserve the TX buffer

memory for better utilization of the packet memory.

Note: The hardware behavior is unknown if an in correct byte count information is written to this

field. Writing a 0 value to this field is not permitted.

Table 8. Transmit Byte Count Format

The data ar ea contains s ix b ytes of Destination Addr es s ( DA) f oll o wed by six bytes of Sour c e Ad dres s ( SA) , f oll o wed by a

variable-length number of bytes. On transmit, all bytes are provided by the CPU, including the source address. The

KSZ8851SNL does not insert its own SA. The 802.3 Frame Length word (Frame Type in Ethernet) is not interpreted by

the KSZ8851SNL. It is treated transparently as data both for transmit operations.

Frame Transmitting Path Operation in TXQ

This section describes the typical register settings for transmitting packets from host processor to KSZ8851SNL with

generic bus interfac e. Us er can us e the d ef ault v al ue f or m o st of the tr ansmit registers. The following Table 9 desc r ibes al l

registers which need to be set and used for transmitting single or multiple frames.

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[bit](offset) Description

TXCR[3:0](0x70)

TXCR[8:5](0x70)

Set transmit control function as below:

Set bit 3 to enable transmitting flow control. Set bit 2 to enable transmitting padding.

Set bit 1 to enable transmitting CRC. Set bit 0 to enable transmitting block operation.

Set transmit checksum generation for ICMP, UDP, TCP and IP packet.

TXMIR[12:0](0x78) The amount of free transmit memory available is represented in units of byte. The TXQ memory (6 KByte)

is used for both frame payload and control word.

TXQCR[0](0x80) For single frame to transmit, set this bit 0 = 1(manual enqueue). the KSZ8851SNL will enable current TX

frame prepared in the TX buffer is queued for transmit, this is only transmit one frame at a time.

Note: This bit is self-clearing after the frame is finished transmitting. The software should wait for the bit to

be cleared before setting up another new TX frame.

TXQCR[1](0x80) When this bit is written as 1, the KSZ8851SNL will generate interrupt (bit 6 in ISR register) to CPU when

TXQ memory is available based upon the total amount of TXQ space requested by CPU at TXNTFSR

(0x9E) register.

Note: This bit is self-clearing after the frame is finished transmitting. The software should wait for the bit to

be cleared before set to 1 again

TXQCR[2](0x80) For multiple frames to transmit, set this bit 2 = 1 (auto-enqueue). the KSZ8851SNL will enable current all

TX frames prepared in the TX buffer are queued to transmit automatically.

RXQCR[3](0x82) Set bit 3 to start DMA access from host CPU either read (receive frame data) or write (transmit data

frame)

TXFDPR[14](0x84) Set bit 14 to enable TXQ transmit frame data pointer register increments automatically on accesses to the

data register.

IER[14][6](0x90) Set bit 14 to enable transmit interrupt in Interrupt Enable Register

Set bit 6 to enable transmit space available interrupt in Interrupt Enable Register.

ISR[15:0](0x92) Write 1 (0xFFFF) to clear all interrupt status bits after interrupt occurred in Interrupt Status Register.

TXNTFSR[15:0](0x9E) The host CPU is used to program the total amount of TXQ buffer space which is required for next total

transmit frames siz e in doubl e- word count.

Table 9. Registers Setting for Transmit Function Block

Driver Routine for Transmit Packet from Host Processor to KSZ8851SNL

The transmit routin e is c alle d b y the u pper layer to tran smit a contiguous b loc k of data throug h th e Et herne t c ontr oller . It is

user’s choice to decide how the transmit routine is implemented. If the Ethernet controller encounters an error while

transm itting the frame, it’s the user’s cho ice to decide whether the driver should attempt to retransm it the same frame or

discard the data. The following Figures 11 and 12 shows the step-by-step for single and multiple transmit packets from

host processor to KSZ8851SNL.

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Figure 11. Host TX Single Frame in Manual Enqueue Flow Diagram

Host receives an Ethernet pkt from

upper layer and prepares transmit pkt

data (data, data_length, frame ID).

The transmit queue frame format is

shown in Table 6

Check if KSZ8851SNL TXQ

Memory size is available for this

transmit pkt ?

(Read TXMIR Reg)

Write an 1?to RXQCR[3] reg to enable

TXQ write access, then Host issues a

SPI opcode=11 to start write transmit

data (control word, byte count and pkt

data) to TXQ memory. This is moving

transmit data from Host to KSZ8851SNL

TXQ memory until whole pkt is finished

Write an 0?to RXQCR[3] reg to end

TXQ write access

Write an 1?to TXQCR[0] reg to issue a

transmit command (manual-enqueue)

to the TXQ. The TXQ wi ll tran s mit th is

pkt data to the PHY port

Option to Read ISR[14] reg, it indicates

that the TXQ has completed to transmit

at least one pkt to the PHY port, then

Write 1? to clear this bit

Yes

Write the total amount of TXQ buffer

space which is required for next

transmit frame size in double-word

count in TXNTFSR[15:0] register

Set bit 1=1 in TXQCR register to

enable the TXQ memory available

monitor

Wait for interrupt

and check if the bit 6=1

(memory space available)

in ISR register

Yes No

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Figure 12. Host TX Multiple Frames in Auto- Enqueue Flow Diagram

Host receives an multiple Ethernet pkts

from upper layer and prepares transmit

pkts data (data, data_length, frame

ID). Each transmit queue frame format

is shown in Table 6

Write an ٛ1?to TXQCR[2] reg

to issue a transmit command (auto-

enqueue) to the TXQ. The TXQ will

transmit all data to the PHY port

Check if KSZ8851SNL TXQ

Memory size is available for these

transmit pkts?

(Read TXMIR Reg)

Write an ٛ1?to RXQCR[3] reg to enable

TXQ write access, then Host issues a

SPI opcode=11 to start write transmit

data (control word, byte count and pkt

data) to TXQ memory. This is moving

transmit data from Host to

KSZ8851SNL TXQ memory until all

pkts are finished

Write an ٛ0?to RXQCR[3] reg to end

TXQ write access

Option to read ISR[14] reg, it indicates

that the TXQ has completed to transmit

all pkts to the PHY port, then

Write ٛ1?to clear this bit

Yes

Write the total amount of TXQ buffer

space which is required for next

transmit total frames size in double-

word count in TXNTFSR[15:0] register

Set bit 1=1 in TXQCR register to

enable the TXQ memory available

monitor

Wait for interrupt

and check if the bit 6=1

(memory space available)

in ISR register

Yes No

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Receive Queue (RXQ) Frame Format

The fr ame form at for the receive que ue is shown in Table 10 . The first word conta ins the status inform ation for the fr ame

received. The second word is the total number of bytes of the RX frame. Following that is the packet data area. The

packet data area holds the frame itself. It includes the CRC checksum.

Packet Memory

Address Offset Bit 15 Bit 0

2nd Byte 1st Byte

0 Status Word

(see description in RXFHSR register)

2 Byte Count

(see description in RXFHBCR register)

4 - up Receive Packet Data

(maximum size is 2000)

Table 10. Frame Format for Receive Queue

Frame Receiving Path Operation in RXQ

This section des cribes the typic al reg ister s ettings for rec eiving pac k ets from KSZ8851 SNL to hos t proces sor with gener ic

bus interface. User can use the default value for most of the receive registers. The following Table 11 describes all

registers which need to be set and used for receiving single or multiple frames.

RXCR1(0x74)

RXCR2(0x76)

Set receive control function as below:

Set RXCR1[10] to enable receiving flow control. Set RXCR1[0] to enable receiving block operation.

Set receive checksum check for ICMP, UDP, TCP and IP packet.

Set receive address filtering scheme as shown in the Table 3.

RXFHSR[15:0](0x7C) This register (read only) indicates the current received frame header status information.

RXFHBCR[11:0](0x7E) This register (read only) indicates the current received frame header byte count information.

RXQCR[12:3](0x82) Set RXQ control function as below:

Set bit 3 to start DMA access from host CPU either read (receive frame data) or write (transmit data

frame). Set bit 4 to automatically enable RXQ frame buffer dequeue. Set bit 5 to enable RX frame count

threshold and read bit 10 for status. Set bit 6 to enable RX data byte count threshold and read bit 11 for

status. Set bit 7 to enable RX frame duration timer threshold and read bit 12 for status. Set bit 9 enable

RX IP header two-byte offset.

RXFDPR[14](0x86) Set bit 14 to enable RXQ address register increments automatically on accesses to the data register.

RXDTTR[15:0](0x8C) To program received frame duration timer value. When Rx frame duration in RXQ exceeds this

threshold in 1 uS interval count and bit 7 of RXQCR register is set to 1, the KSZ8851SNL will generate

RX interrupt in ISR[13] and indicate the status in RXQCR[12].

RXDBCTR[15:0](0x8E) To program received data byte count value. When the number of received bytes in RXQ exceeds this

threshold in byte count and bit 6 of RXQCR register is set to 1, the KSZ8851SNL will generate RX

interrupt in ISR[13] and indicate the status in RXQCR[11].

IER[13](0x90) Set bit 13 to enable receive interrupt in Interrupt Enable Register.

ISR[15:0](0x92) Write 1 (0xFFFF) to clear all interrupt status bits after interrupt occurred in Interrupt Status Register.

RXFCTR[15:8](0x9C) Rx frame count read only. To indicate the total received frame in RXQ frame buffer when receive

interrupt (bit 13 in ISR) occurred.

RXFCTR[7:0](0x9C) To program received frame count value. When the number of received frames in RXQ e xceeds this

threshold value and bit 5 of RXQCR register is set to 1, the KSZ8851SNL will generate RX interrupt in

ISR[13] and indicate the status in RXQCR[10].

Table 11. Registers Setting for Receive Function Block

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Driver Routine for Receive Packet from KSZ8851SNL to Host Processor

The s oftware driv er recei ves data pac ket f rames f rom the KSZ8 851SNL d evice e ither as a result of polling or an i nterrupt

based service. When an interrupt is received, the OS invokes the interrupt service routine that is in the interrupt vector

table.

If your system has OS su pport, to minimize interrupt lock out time, the interrupt service routine should handle at interrupt

level on ly those tasks that require m inimum execution time, such as error check ing or device status change. T he routine

should qu eue al l the t im e-consum ing work to tr ansfer the pac ket fr om the KSZ 8851SNL RXQ into s ystem mem or y at task

level. The following Figure 13 shows the step-by-step for receive packets from KSZ8851SNL to host processor.

Note: Each D MA read operation f rom the hos t CPU to read RX Q fram e buffer, the first read data ( byte in 8-bit bus m ode,

word in 16-bit bus mode and double word in 32-bit bus mode) is dummy data and must be discarded by host CPU.

Afterward, host CPU must read each frame data to align with double word boundary at end. For example, the host CPU

has to read up to 68 bytes if received frame size is 65 bytes.

Figure 13. Host RX Single or Multiple Frames in Auto-Dequeue Flow Diagram

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In order to read received frames from RXQ without error, the software driver must use following steps:

1. When receive interrupt occurred and software driver writes “1” to clear the RX interrupt in ISR register; the

KSZ8851 will update Receive Frame Counter (RXFCTR) Register for this interrupt.

2. When software driver reads back Receive Frame Count (RXFCTR) Register; the KSZ8851 will update both

Receive Frame Header Status and Byte Count Registers (RXFHSR/RXFHBCR).

3. When software driver reads back both Receive Frame Header Status and Byte Count Registers

(RXFHSR/RXFHBCR); the KSZ8851 will update next receive frame header status and byte count registers

(RXFHSR/RXFHBCR).

EEPROM Interface

It is optional in the KSZ8851SNL to use an external EEPROM. The EED_IO (pin 6) must be pulled high to use external

EEPROM oth er wis e this pi n pull ed lo w or float ing wit h out EE PRO M.

An externa l ser ia l EEPROM with a stan dar d microwir e bus interface is us ed f or non-vol ati le stor ag e of information s uc h as

the host MAC ad dress. T he KSZ8851SN L can detec t if the EEPRO M is a 1KB (9 3C46) or 4KB (93C 66) EE PROM devic e

(the 93C46 and the 93C66 are typical EEPROM devices). The EEPROM must be organized as 16-bit mode.

If the EED _IO p in is p ul le d hig h, th en th e K SZ88 51 SN L per f orms an automatic read of the ex ternal E EPRO M words 0H t o

3H after the de-assertion of Reset. The EEPROM values are placed in certain host-accessible registers. EEPROM

read/write functions can also be performed by software read/writes to the EEPCR (0x22) registers.

The KSZ8851SNL EEPROM format is given in Table 12.

WORD 15 8 7 0

0H Reserved

1H Host MAC Address Byte 2 Host MAC Address Byte 1

2H Host MAC Address Byte 4 Host MAC Address Byte 3

3H Host MAC Address Byte 6 Host MAC Address Byte 5

4H – 6H Reserved

7H-3FH Not used for KSZ8851SNL (available fo r user to use)

Table 12. KSZ8851SNL EEPROM Format

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Loopback Support

The KSZ8 851SNL pr ovides two loo pback m odes, one is Near-en d (Remote) loopbac k to suppor t for rem ote diagnos tic of

failure at line side, and the other is Far-end (Local) loopback to support for local diagnostic of failure at host side. In

loopback mode, the speed at the PHY port will be set to 100BASE-TX full-duplex mode.

Near-end (Remote) Loopback

Near-end (R em ote) loop back is conducted a t PHY p ort 1 of the KSZ 8851 SNL. T he lo opback path s tarts at th e PH Y port’s

receive inp uts ( RXP/RXM) , wraps around at the s am e PHY port’s PMD/P MA, and ends at the PH Y port’s transm it outputs

(TXP/TXM).

Bit [9] of regis t er P1 SCL M D ( 0xF 4) is us ed to ena bl e near -en d loopbac k . T he po r ts 1 near- en d lo opb ac k path is illus tr a ted

in the following Figure 14.

Far-end (Local) Loopback

Far-end (Local) loopback is conducted at Host of the KSZ8851SNL. The loopback path starts at the host SPI FIFO write

to transmit data, wraps around at the PHY port’s PMD/PMA, and ends at the host SPI FIFO read to receive data.

Bit [14] of register P1MBCR (0xE4) is used to enable far-end loopback at host side. The host far-end loopback path is

illustrated in the following Figure 14.

Figure 14. PHY Port 1 Near-end (Remote) and Host Far-end (Local) Loopback Paths

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SPI Interface to I/O Registers

The KSZ8 851SN L pro vides a SPI i nterfac e for the hos t CPU to ac cess its internal I/O regist ers. I/O re gisters s erve as the

address that the microprocessor uses when communicating with the device. This is used for configuring operational

settings, reading or writing control, status information, and transferring packets.

I/O Registers

The following I/O Space Mapping Tables apply to 8-bit, 16-bit or 32-bit access. Depending upon the byte enable bits

B[3:0] setti ngs in comm and phas e, each I / O ac c ess c an be perf ormed the f ollo win g operations as an 8- bit f or 256 ad dres s

locations, 16-bit for 128 address locations or 32-bit for 64 address locations.

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Internal I/O Registers Space Mapping

I/O Register Offset Location

32-Bit 16-Bit 8-Bit

Name Default

Value Description

0x00 - 0x01 0x00

0x01

0x00

0x03 0x02 - 0x03 0x02

0x03

Reserved Don’t care None

0x04 - 0x05 0x04

0x05

0x04

0x07 0x06 - 0x07 0x06

0x07

Reserved Don’t care None

0x08 - 0x09 0x08

0x09 CCR Read only

Chip Configuration Register [7:0]

Chip Configuration Register [15:8]

0x08

0x0B 0x0A - 0x0B 0x0A

0x0B Reserved Don’t care None

0x0C - 0x0D 0x0C

0x0D

0x0C

0x0F 0x0E - 0x0F 0x0E

0x0F

Reserved Don’t care None

0x10 - 0x11 0x10

0x11 MARL -

MAC Address Register Low [7:0]

MAC Address Register Low [15:8]

0x10

0x13 0x12 - 0x13 0x12

0x13 MARM -

MAC Address Register Middle [7:0]

MAC Address Register Middle [15:8]

0x14 - 0x15 0x14

0x15 MARH -

MAC Address Register High [7:0]

MAC Address Register High [15:8]

0x14

0x17 0x16 - 0x17 0x16

0x17 Reserved Don’t care None

0x18 - 0x19 0x18

0x19

0x18

0x1B 0x1A - 0x1B 0x1A

0x1B

Reserved Don’t care

None

0x1C - 0x1D 0x1C

0x1D

0x1C

0x1F 0x1E - 0x1F 0x1E

0x1F

Reserved Don’t care

None

0x20 - 0x21 0x20

0x21 OBCR 0x0000

On-Chip Bus Control Register [7:0]

On-Chip Bus Control Register [15:8]

0x20

0x23 0x22 - 0x23 0x22

0x23 EEPCR 0x0000

EEPROM Control Register [7:0]

EEPROM Control Register [15:8]

0x24 - 0x25 0x24

0x25 MBIR 0x1010

Memory BIST Info Register [7:0]

Memory BIST Info Register [15:8]

0x24

0x27 0x26 - 0x27 0x26

0x27 GRR 0x0000 Global Reset Register [7:0]

Global Reset Register [15:8]

0x28 - 0x29 0x28

0x29 Reserved Don’t care

None

0x28

0x2B 0x2A - 0x2B 0x2A

0x2B WFCR 0x0000

Wakeup Frame Control Register [7:0]

Wakeup Frame Control Register [15:8]

0x2C - 0x2D 0x2C

0x2D

0x2C

0x2F 0x2E - 0x2F 0x2E

0x2F

Reserved Don’t care

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I/O Register Offset Location

32-Bit 16-Bit 8-Bit

Name Default

Value Description

0x30 - 0x31 0x30

0x31 WF0CRC0 0x0000 Wakeup Frame 0 CRC0 Register [7:0]

Wakeup Frame 0 CRC0 Register [15:8]

0x30

0x33 0x32 - 0x33 0x32

0x33 WF0CRC1 0x0000 W akeup Frame 0 CRC1 Register [7 :0]

Wakeup Frame 0 CRC1 Register [15:8]

0x34 - 0x35 0x34

0x35 WF0BM0 0x0000

Wakeup Frame 0 Byte Mask 0 Register [7:0]

Wakeup Frame 0 Byte Mask 0 Register [15:8]

0x34

0x37 0x36 - 0x37 0x36

0x37 WF0BM1 0x0000

Wakeup Frame 0 Byte Mask 1 Register [7:0]

Wakeup Frame 0 Byte Mask 1 Register [15:8]

0x38 - 0x39 0x38

0x39 WF0BM2 0x0000

Wakeup Frame 0 Byte Mask 2 Register [7:0]

Wakeup Frame 0 Byte Mask 2 Register [15:8]

0x38

0x3B 0x3A - 0x3B 0x3A

0x3B WF0BM3 0x0000

Wakeup Frame 0 Byte Mask 3 Register [7:0]

Wakeup Frame 0 Byte Mask 3 Register [15:8]

0x3C - 0x3D 0x3C

0x3D

0x3C

0x3F 0x3E - 0x3F 0x3E

0x3F

Reserved Don’t care None

0x40 - 0x41 0x40

0x41 WF1CRC0 0x0000 Wakeup Frame 1 CRC0 Register [7:0]

Wakeup Frame 1 CRC0 Register [15:8]

0x40

0x43 0x42 - 0x43 0x42

0x43 WF1CRC1 0x0000 W akeup Frame 1 CRC1 Register [7 :0]

Wakeup Frame 1 CRC1 Register [15:8]

0x44 - 0x45 0x44

0x45 WF1BM0 0x0000

Wakeup Frame 1 Byte Mask 0 Register [7:0]

Wakeup Frame 1 Byte Mask 0 Register [15:8]

0x44

0x47 0x46 - 0x47 0x46

0x47 WF1BM1 0x0000

Wakeup Frame 1 Byte Mask 1 Register [7:0]

Wakeup Frame 1 Byte Mask 1 Register [15:8]

0x48 - 0x49 0x48

0x49 WF1BM2 0x0000

Wakeup Frame 1 Byte Mask 2 Register [7:0]

Wakeup Frame 1 Byte Mask 2 Register [15:8]

0x48

0x4B 0x4A - 0x4B 0x4A

0x4B WF1BM3 0x0000

Wakeup Frame 1 Byte Mask 3 Register [7:0]

Wakeup Frame 1 Byte Mask 3 Register [15:8]

0x4C - 0x4D 0x4C

0x4D

0x4C

0x4F 0x4E - 0x4F 0x4E

0x4F

Reserved Don’t care None

0x50 - 0x51 0x50

0x51 WF2CRC0 0x0000 W akeup Frame 2 CRC0 Register [7 :0]

Wakeup Frame 2 CRC0 Register [15:8]

0x50

0x53 0x52 - 0x53 0x52

0x53 WF2CRC1 0x0000 W akeup Frame 2 CRC1 Register [7 :0]

Wakeup Frame 2 CRC1 Register [15:8]

0x54 - 0x55 0x54

0x55 WF2BM0 0x0000

Wakeup Frame 2 Byte Mask 0 Register [7:0]

Wakeup Frame 2 Byte Mask 0 Register [15:8]

0x54

0x57 0x56 - 0x57 0x56

0x57 WF2BM1 0x0000

Wakeup Frame 2 Byte Mask 1 Register [7:0]

Wakeup Frame 2 Byte Mask 1 Register [15:8]

0x58 - 0x59 0x58

0x59 WF2BM2 0x0000

Wakeup Frame 2 Byte Mask 2 Register [7:0]

Wakeup Frame 2 Byte Mask 2 Register [15:8]

0x58

0x5B 0x5A - 0x5B 0x5A

0x5B WF2BM3 0x0000 Wakeup Frame 2 Byte Mask 3 Register [7:0]

Wakeup Frame 2 Byte Mask 3 Register [15:8]

0x5C - 0x5D 0x5C

0x5D

0x5C

0x5F 0x5E - 0x5F 0x5E

0x5F

Reserved Don’t care None

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I/O Register Offset Location

32-Bit 16-Bit 8-Bit

Name Default

Value Description

0x60 - 0x61 0x60

0x61 WF3CRC0 0x0000 W akeup Frame 3 CRC0 Register [7 :0]

Wakeup Frame 3 CRC0 Register [15:8]

0x60

0x63 0x62 - 0x63 0x62

0x63 WF3CRC1 0x0000 W akeup Frame 3 CRC1 Register [7 :0]

Wakeup Frame 3 CRC1 Register [15:8]

0x64 - 0x65 0x64

0x65 WF3BM0 0x0000

Wakeup Frame 3 Byte Mask 0 Register [7:0]

Wakeup Frame 3 Byte Mask 0 Register [15:8]

0x64

0x67 0x66 - 0x67 0x66

0x67 WF3BM1 0x0000

Wakeup Frame 3 Byte Mask 1 Register [7:0]

Wakeup Frame 3 Byte Mask 1 Register [15:8]

0x68 - 0x69 0x68

0x69 WF3BM2 0x0000

Wakeup Frame 3 Byte Mask 2 Register [7:0]

Wakeup Frame 3 Byte Mask 2 Register [15:8]

0x68

0x6B 0x6A - 0x6B 0x6A

0x6B WF3BM3 0x0000

Wakeup Frame 3 Byte Mask 3 Register [7:0]

Wakeup Frame 3 Byte Mask 3 Register [15:8]

0x6C - 0x6D 0x6C

0x6D

0x6C

0x6F 0x6E - 0x6F 0x6E

0x6F

Reserved Don’t care None

0x70 - 0x71 0x70

0x71 TXCR 0x0000

Transmit Control Register [7:0]

Transmit Control Register [15:8]

0x70

0x73 0x72 - 0x73 0x72

0x73 TXSR 0x0000

Transmit Status Register [7:0]

Transmit Status Register [15:8]

0x74 - 0x75 0x74

0x75 RXCR1 0x0800

Receive Control Register 1 [7:0]

Receive Control Register 1 [15:8]

0x74

0x77 0x76 - 0x77 0x76

0x77 RXCR2 0x0004

Receive Control Register 2 [7:0]

Receive Control Register 2 [15:8]

0x78 - 0x79 0x78

0x79 TXMIR 0x0000

TXQ Memory Information Register [7:0]

TXQ Memory Information Register [15:8]

0x78

0x7B 0x7A - 0x7B 0x7A

0x7B Reserved Don’t care None

0x7C - 0x7D 0x7C

0x7D RXFHSR 0x0000

Receive Frame Header Status Register [7:0]

Receive Frame Header Status Register [15:8]

0x7C

0x7F 0x7E - 0x7F 0x7E

0x7F RXFHBCR 0x0000

Receive Frame Header Byte Count Register [7:0]

Receive Frame Header Byte Count Register [15:8]

0x80 - 0x81 0x80

0x81 TXQCR 0x0000

TXQ Command Register [7:0]

TXQ Command Register [15:8]

0x80

0x83 0x82 - 0x83 0x82

0x83 RXQCR 0x0000

RXQ Command Register [7:0]

RXQ Comm and Register [15:8]

0x84 - 0x85 0x84

0x85 TXFDPR 0x0000

TX Frame Data Pointer Register [7:0]

TX Frame Data Pointer Register [15:8]

0x84

0x87 0x86 - 0x87 0x86

0x87 RXFDPR 0x0000 RX Frame Data Pointer Register [7:0]

RX Frame Data Pointer Register [15:8]

0x88 - 0x89 0x88

0x89

0x88

0x8B 0x8A - 0x8B 0x8A

0x8B

Reserved Don’t care None

0x8C - 0x8D 0x8C

0x8D RXDTTR 0x0000

RX Duration Timer Threshold Register [7:0]

RX Duration Timer Threshold Register [15:8]

0x8C

0x8F 0x8E - 0x8F 0x8E

0x8F RXDBCTR 0x0000

RX Data Byte Count Th reshold Register [7:0]

RX Data Byte Count Threshold Register [15:8]

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I/O Register Offset Location

32-Bit 16-Bit 8-Bit

Name Default

Value Description

0x90 - 0x91 0x90

0x91 IER 0x0000 Interrupt Enable Register [7:0]

Interrupt Enable Register [15:8]

0x90

0x93 0x92 - 0x93 0x92

0x93 ISR 0x0300

Interrupt Status Register [7:0]

Interrupt Status Register [15:8]

0x94 - 0x95 0x94

0x95

0x94

0x97 0x96 - 0x97 0x96

0x97

Reserved Don’t care None

0x98 - 0x99 0x98

0x99

0x98

0x9B 0x9A - 0x9B 0x9A

0x9B

Reserved Don’t care None

0x9C - 0x9D 0x9C

0x9D RXFCTR 0x0000

RX Frame Count & Threshold Register [7:0]

RX Frame Count & Threshol d Register [15:8]

0x9C

0x9F 0x9E - 0x9F 0x9E

0x9F TXNTFSR 0x0000

TX Next Total Frames Size Register [7:0]

TX Next Total Frames Size Register [15:8]

0xA0 - 0xA1 0xA0

0xA1 MAHTR0 0x0000

MAC Address Hash Table Register 0 [7:0]

MAC Address Hash Table Register 0 [15:8]

0xA0

0xA3 0xA2 - 0xA3 0xA2

0xA3 MAHTR1 0x0000

MAC Address Hash Table Register 1 [7:0]

MAC Address Hash Table Register 1 [15:8]

0xA4 - 0xA5 0xA4

0xA5 MAHTR2 0x0000

MAC Address Hash Table Register 2 [7:0]

MAC Address Hash Table Register 2 [15:8]

0xA4

0xA7 0xA6 - 0xA7 0xA6

0xA7 MAHTR3 0x0000

MAC Address Hash Table Register 3 [7:0]

MAC Address Hash Table Register 3 [15:8]

0xA8 - 0xA9 0xA8

0xA9

0xA8

0xAB 0xAA - 0xAB 0xAA

0xAB

Reserved Don’t care

None

0xAC - 0xAD 0xAC

0xAD

0xAC

0xAF 0xAE - 0xAF 0xAE

0xAF

Reserved Don’t care None

0xB0 - 0xB1 0xB0

0xB1 FCLWR 0x0500

Flow Control Low Watermark Register [7:0]

Flow Control Low Watermark Register [15:8]

0xB0

0xB3 0xB2 - 0xB3 0xB2

0xB3 FCHWR 0x0300

Flow Control High Watermark Register [7:0]

Flow Control High Watermark Register [15:8]

0xB4 - 0xB5 0xB4

0xB5 FCOWR 0x0040

Flow Control Ov errun Watermark Register [7:0]

Flow Control Overrun Watermark Register [15:8]

0xB4

0xB7 0xB6 - 0xB7 0xB6

0xB7 Reserved Don’t care None

0xB8 - 0xB9 0xB8

0xB9

0xB8

0xBB 0xBA - 0xBB 0xBA

0xBB

Reserved Don’t care None

0xBC - 0xBD 0xBC

0xBD

0xBC

0xBF 0xBE - 0xBF 0xBE

0xBF

Reserved Don’t care None

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I/O Register Offset Location

32-Bit 16-Bit 8-Bit

Name Default

Value Description

0xC0 - 0xC1 0xC0

0xC1 CIDER 0x8870 Chip ID and Enable Register [7:0]

Chip ID and Enable Register [15:8]

0xC0

0xC3 0xC2 - 0xC3 0xC2

0xC3 Reserved Don’t care None

0xC4 - 0xC5 0xC4

0xC5 Reserved Don’t care None

0xC4

0xC7 0xC6 - 0xC7 0xC6

0xC7 CGCR 0x0835

Chip Global Control Register [7:0]

Chip Global Control Re gister [15:8]

0xC8 - 0xC9 0xC8

0xC9 IACR 0x0000

Indirect Access Control Register [7:0]

Indirect Access Control Register [15:8]

0xC8

0xCB 0xCA - 0xCB 0xCA

0xCB Reserved Don’t care None

0xCC - 0xCD 0xCC

0xCD

0xCC

0xCF 0xCE - 0xCF 0xCE

0xCF

Reserved Don’t care None

0xD0 - 0xD1 0xD0

0xD1 IADLR 0x0000

Indirect Access Data Low Register [7:0]

Indirect Access Data Low Register [15:8]

0xD0

0xD3 0xD2 - 0xD3 0xD2

0xD3 IADHR 0x0000

Indirect Access Data High Register [7:0]

Indirect Access Data High Register [15:8]

0xD4 - 0xD5 0xD4

0xD5 PMECR 0x0080 Power Management Event Control Register [7:0]

Power Management Event C ontrol Register [15:8]

0xD4

0xD7 0xD6 - 0xD7 0xD6

0xD7 GSWUTR 0X080C

Go-Sleep & Wake-Up Time Register [7:0]

Go-Sleep & Wake-Up Time Register [15:8]

0xD8 - 0xD9 0xD8

0xD9 PHYRR 0x0000

PHY Reset Register [7 :0]

PHY Reset Register [15:8]

0xD8

0xDB 0xDA - 0xDB 0xDA

0xDB Reserved Don’t care None

0xDC - 0xDD 0xDC

0xDD

0xDC

0xDF 0xDE - 0xDF 0xDE

0xDF

Reserved Don’t care None

0xE0 - 0xE1 0xE0

0xE1

0xE0

0xE3 0xE2 - 0xE3 0xE2

0xE3

Reserved Don’t care None

0xE4 - 0xE5 0xE4

0xE5 P1MBCR 0x3120

PHY 1 MII-Register Basic Control Register [7:0]

PHY 1 MII-Register Basic Control Register [15:8]

0xE4

0xE7 0xE6 - 0xE7 0xE6

0xE7 P1MBSR 0x7808

PHY 1 MII-Register Basic Status Register [7:0]

PHY 1 MII-Register Basic Status Register [15:8]

0xE8 - 0xE9 0xE8

0xE9 PHY1ILR 0x1430

PHY 1 PHY ID Low Register [7:0]

PHY 1 PHY ID Low Register [15:8]

0xE8

0xEB 0xEA - 0xEB 0xEA

0xEB PHY1IHR 0x0022

PHY 1 PHY ID High Register [7:0]

PHY 1 PHY ID High Register [15:8]

PHY 1 Aut o-Negotiation Adv ertisement R egister [7:0 ]

0xEC - 0xED 0xEC

0xED P1ANAR 0x05E1

PHY 1 Auto-Negotiation Advertisement

Regi ster [ 15: 8]

PHY 1 Auto-Negotiation Link Partner Ability Register [7:0]

0xEC

0xEF 0xEE - 0xEF 0xEE

0xEF P1ANLPR 0x0001

PHY 1 Auto-Negotiation Link Partner Ability Register [15:8]

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I/O Register Offset Location

32-Bit 16-Bit 8-Bit

Name Default

Value Description

0xF0 - 0xF1 0xF0

0xF1

0xF0

0xF3 0xF2 - 0xF3 0xF2

0xF3

Reserved Don’t care None

0xF4 - 0xF5 0xF4

0xF5 P1SCLMD 0x0000 Port 1 PHY Special Control/Status, LinkM D® [7:0]

Port 1 PHY Special Control/Status, LinkMD® [15:8]

0xF4

0xF7 0xF6 - 0xF7 0xF6

0xF7 P1CR 0x00FF

Port 1 Control Register [7:0]

Port 1 Control Register [15:8]

0xF8 - 0xF9 0xF8

0xF9 P1SR 0x8080

Port 1 Status Register [7:0]

Port 1 Status Register [15:8]

0xF8

0xFB 0xFA - 0xFB 0xFA

0xFB Reserved Don’t care None

0xFC - 0xFD 0xFC

0xFD

0xFC

0xFF 0xFE - 0xFF 0xFE

0xFF

Reserved Don’t care None

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Do not write to bit values or to registers defined as Reserved. Manipulating reserved bits or registers causes

unpredictable and often fatal results. If the user wants to write to these reserved bits, the user has to read back these

reserved bits (RO or RW) first, then “OR” with the read value of the reserved bits and write back to these reserved bits.

Bit Type Definition

RO = Read only.

WO = Write only.

RW = Read/Write.

W1C = Write 1 to Clear (writing an “1” to clear this bit).

0x00 – 0x07: Reserved

Chip Configuration Register (0x08 – 0x09): CCR

This register indicates the chip configuration mode based on strapping and bonding options

Bit Default Value R/W Description

15-10 - RO Reserved

9 - RO

EEPROM presence

The EED_IO (pin 6) value is latched into this bit druing power-up/reset.

0: No external EEPROM, 1: Us e external EEPROM.

8 - RO

SPI bus mode

To indicate this is SPI interface for host

0: No, 1: Yes.

7-4 0x0 RO

Reserved

3 0 RO

Reserved

2 0 RO

Reserved

1 0 RO

Reserved

0 - RO

32-Pin Chip Package

To indicate this device is KSZ8851SNL.

0: No, 1: Yes

0x0A – 0x0F: Reserved

Host MAC Address Registers: MARL, MARM and MARH

These Host MAC address registers are loaded starting at word location 0x1 of the EEPROM upon hardware reset. The

software driver can read or write these registers value, but it will not modify the original Host MAC address value in the

EEPROM. These six bytes of Host MAC address in external EEPROM are loaded to these three registers as mapping

below:

MARL[15 :0] = EE PROM 0x 1( MAC Byte 2 and 1)

MARM[15 :0] = EE PROM 0x2(MAC B yte 4 and 3)

MARH[15: 0] = EEPRO M 0x3( MAC Byte 6 and 5)

The Host MAC address is used to define the individual destination address that the KSZ8851SNL responds to when

receiving frames. Network addresses are generally expressed in the form of 01:23:45:67:89:AB, where the bytes are

received from left to right, and the bits within each byte are received from right to left (LSB to MSB). For example, the

actual transmitted and received bits are on the order of 10000000 11000100 10100010 11100110 10010001 11010101.

These three registers value for Host MAC address 01:23:45:67:89:AB will be held as below:

MARL[15 :0] = 0x8 9A B

MARM[15:0] = 0x4567

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MARH[15: 0] = 0x0123

Host MAC Address Register Low (0x10 – 0x11): MARL

The following table shows the register bit fields for Low word of Host MAC address.

Bit Default Value R/W Description

15-0 - RW

MARL MAC Address Low

The least significant word of the MAC address.

Host MAC Address Register Middle (0x12 – 0x13): MARM

The following table shows the register bit fields for middle word of Host MAC address.

Bit Default Value R/W Description

15-0 - RW

MARM MAC Address Middle

The middle word of the MAC address.

Host MAC Address Register High (0x14 – 0x15): MARH

The following table shows the register bit fields for high word of Host MAC address.

Bit Default Value R/W Description

15-0 - RW

MARH MAC Address High

The Most significant word of the MAC address.

0x16 – 0x1F: Reserved

On-Chip Bus Control Register (0x20 – 0x21): OBCR

This regis ter contr o ls th e o n- chip bus c lock speed f or t he K SZ8 851SNL. The defa ult of the o n- c hip bus cl oc k speed is 12 5

MHz. When the external host CPU is running at a higher clock rate, the on-chip bus should be adjusted for the best

performance.

Bit Default Value R/W Description

15-7 - RO

Reserved

6 0 RW

Output Pin Drive Strength

Bi-directional or output pad drive strength selection.

0: 8 mA

1: 16 mA

5-3 0x0 RO

Reserved

2 0 RW

On-Chip Bus Clock Selection

0: 125 MHz (default setting is divided by 1, Bit[1:0]=00)

1: NA (reserved)

1-0 0x0 RW

On-Chip Bus Clock Divider Selection

00: Divided by 1.

01: Divided by 2.

10: Divided by 3.

11: NA (reserved).

For example to contol the bus clock speed as below:

If Bit 2 = 0 and this value is set 00 to select 125 MHz.

If Bit 2 = 0 and this value is set 01 to select 62.5 MHz.

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EEPROM Control Register (0x22 – 0x23): EEPCR

To support an external EEPROM, pulled-up the EED_IO pin to High; otherwise, it is pulled-down to Low. If an external

EEPROM is not used, the software progr ams the host MAC address. If an EEPROM is used in the design, the chip host

MAC addres s is lo ade d f r om the EE PRO M im mediately af ter r es et. T he KSZ 8 851 SNL a ll o ws the software to ac ces s (r ead

and write) the EEPROM directly; that is, the EEPROM access timing can be fully controlled by the software if the

EEPROM Software Access bit is set.

Bit Default Value R/W Description

15-6 - RO

Reserved.

5 0 WO

EESRWA EEPROM Software Read or Write Access

0: software read enable to access EEPROM when software access enabled (bit 4 is “1”)

1: software write enable to access EEPROM when software access enabled (bit 4 is “1 ”).

4 0 RW

EESA EEPROM Software Access

1: enable software to access EEPROM through bit 3 to bit 0.

0: disable software to access EEPROM.

3 - RO

EESB EEPROM Status Bit

Data Receive from EEPROM. This bit directly reads the EED_IO pin 6.

2-0 0x0 RW

EECB EEPROM Control Bits

Bit 2: Data Transmit to EEPROM. This bit directly controls the device’s EED_IO pin 6.

Bit 1: Serial Clock. This bit directly controls the device’s EESK pin 7.

Bit 0: Chip Select for EEPROM. This bit directly controls the device’s EECS pin 10.

Memory BIST Info Register (0x24 – 0x25): MBIR

This register indicates the build-in self test result for both TX and RX memories after power-up/reset.

Bit Default Value R/W Description

15-13 0x0 RO Reserved

12 - RO

TXMBF TX Memory BIST Test Finish

When set, it indicates the Memory Built In Self Test completion for the TX Memory.

11 - RO

TXMBFA TX Memory BIST Test Fail

When set, it indicates the TX Memory Built In Self Test has failed.

10-8 - RO

TXMBFC TX Memory BIST Test Fail Count

To indicate the TX Memory Built In Self Test failed count

7-5 - RO

Reserved

4 - RO

RXMBF RX Memory Bist Finish

When set, it indicates the Memory Built In Self Test completion for the RX Memory.

3 - RO

RXMBFA RX Memory Bist Fail

When set, it indicates the RX Memory Built In Self Test has failed.

2-0 - RO

RXMBFC RX Memory BIST Test Fail Count

To indicate the RX Memory Built In Self Test failed count.

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Global Reset Register (0x26 – 0x27): GRR

This register controls the global and QMU reset functions with information programmed by the CPU.

Bit Default Value R/W Description

15-2 0x0000 RO Reserved

1 0 RW

QMU Module Soft Reset

1: Software reset is active to clear both TXQ and RXQ memories.

0: Software reset is inactive.

QMU software reset will flush out all TX/RX packet data inside the TXQ and RXQ

memories and reset all QMU registers to default value.

0 0 RW

Global Soft Reset

1: Software reset is active.

0: Software reset is inactive.

Global software reset will affect PHY, MAC, QMU, DMA, and the switch core, all registers

value are set to default value.

0x28 – 0x29: Reserved

Wakeup Frame Control Register (0x2A – 0x2B): WFCR

This register holds control information programmed by the CPU to control the wake up frame function.

Bit Default Value R/W Description

15-8 0x00 RO Reserved

7 0 RW

MPRXE

Magic Packet RX Enable

When set, it enables the magic packet pattern detection.

When reset, the magic packet pattern detection is disabled.

6-4 0x0 RO

Reserved

3 0 RW

WF3E

Wake up Frame 3 Enable

When set, it enables the Wake up frame 3 pattern detection.

When reset, the Wake up frame 3 pattern detection is disabled.

2 0 RW

WF2E

Wake up Frame 2 Enable

When set, it enables the Wake up frame 2 pattern detection.

When reset, the Wake up frame 2 pattern detection is disabled.

1 0 RW

WF1E

Wake up Frame 1 Enable

When set, it enables the Wake up frame 1 pattern detection.

When reset, the Wake up frame 1 pattern detection is disabled.

0 0 RW

WF0E

Wake up Frame 0 Enable

When set, it enables the Wake up frame 0 pattern detection.

When reset, the Wake up frame 0 pattern detection is disabled.

0x2C – 0x2F: Reserved

Wakeup Frame 0 CRC0 Register (0x30 – 0x31): WF0CRC0

This register contains the expected CRC values of the Wake up frame 0 pattern.

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The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard; it is taken over the bytes specified in

the wake up byte mask registers.

Bit Default Value R/W Description

15-0 0x0000 RW WF0CRC0

Wake up Frame 0 CRC (lower 16 bits)

The expected CRC value of a Wake up frame 0 pattern.

Wakeup Frame 0 CRC1 Register (0x32 – 0x33): WF0CRC1

This register contains the expected CRC values of the Wake up frame 0 pattern.

The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard; it is taken over the bytes specified in

the wake up byte mask registers.

Bit Default Value R/W Description

15-0 0x0000 RW WF0CRC1

Wake up Frame 0 CRC (upper 16 bits).

The expected CRC value of a Wake up frame 0 pattern.

Wakeup Frame 0 Byte Mask 0 Register (0x34 – 0x35): WF0BM0

This register contains the first 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the first byte

of the Wake up frame 0, setting bit 15 selects the 16th byte of the Wake up frame 0.

Bit Default Value R/W Description

15-0 0x0000 RW WF0BM0

Wake up Frame 0 Byte Mask 0

The first 16 bytes mask of a Wake up frame 0 pattern.

Wakeup Frame 0 Byte Mask 1 Register (0x36 – 0x37): WF0BM1

This register contains the next 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the 17th byte

of the Wake up frame 0. Setting bit 15 selects the 32nd byte of the Wake up frame 0.

Bit Default Value R/W Description

15-0 0x0000 RW WF0BM1

Wake up Frame 0 Byte Mask 1.

The next 16 bytes mask covering bytes 17 to 32 of a Wake up frame 0 pattern.

Wakeup Frame 0 Byte Mask 2 Register (0x38 – 0x39): WF0BM2

This register contains the next 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the 33rd byte

of the Wake up frame 0. Setting bit 15 selects the 48th byte of the Wake up frame 0.

Bit Default Value R/W Description

15-0 0x0000 RW WF0BM2

Wake-up Frame 0 Byte Mask 2.

The next 16 bytes mask covering bytes 33 to 48 of a Wake-up frame 0 pattern.

Wakeup Frame 0 Byte Mask 3 Register (0x3A – 0x3B): WF0BM3

This register contains the last 16 bytes mask values of the Wake up frame 0 pattern. Setting bit 0 selects the 49th byte

of the Wake up frame 0. Setting bit 15 selects the 64th byte of the Wake up frame 0.

Bit Default Value R/W Description

15-0 0x0000 RW WF0BM3

Wake-up Frame 0 Byte Mask 3.

The last 16 bytes mask covering bytes 49 to 64 of a Wake-up frame 0 pattern.

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0x3C – 0x3F: Reserved

Wakeup Frame 1 CRC0 Register (0x40 – 0x41): WF1CRC0

This register contains the expected CRC values of the Wake up frame 1 pattern.

The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard; it is taken over the bytes specified in

the wake up byte mask registers.

Bit Default Value R/W Description

15-0 0x0000 RW WF1CRC0

Wake-up frame 1 CRC (lower 16 bits).

The expected CRC value of a Wake-up frame 1 pattern.

Wakeup Frame 1 CRC1 Register (0x42 – 0x43): WF1CRC1

This register contains the expected CRC values of the Wake up frame 1 pattern.

The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in

the wake up byte mask registers.

Bit Default Value R/W Description

15-0 0x0000 RW WF1CRC1

Wake-up frame 1 CRC (upper 16 bits).

The expected CRC value of a Wake-up frame 1 pattern.

Wakeup Frame 1 Byte Mask 0 Register (0x44 – 0x45): WF1BM0

This register contains the first 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the first byte

of the Wake up frame 1, setting bit 15 selects the 16th byte of the Wake up frame 1.

Bit Default Value R/W Description

15-0 0x0000 RW WF1BM0

Wake-up frame 1 Byte Mask 0.

The first 16 bytes mask of a Wake-up frame 1 pattern.

Wakeup Frame 1 Byte Mask 1 Register (0x46 – 0x47): WF1BM1

This register contains the next 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the 17th byte

of the Wake up frame 1. Setting bit 15 selects the 32nd byte of the Wake up frame 1.

Bit Default Value R/W Description

15-0 0x0000 RW WF1BM1

Wake-up frame 1 Byte Mask 1.

The next 16 bytes mask covering bytes 17 to 32 of a Wake-up frame 1 pattern.

Wakeup Frame 1 Byte Mask 2 Register (0x48 – 0x49): WF1BM2

This register contains the next 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the 33rd byte

of the Wake up frame 1. Setting bit 15 selects the 48th byte of the Wake up frame 1.

Bit Default Value R/W Description

15-0 0x0000 RW WF1BM2

Wake-up frame 1 Byte Mask 2.

The next 16 bytes mask covering bytes 33 to 48 of a Wake-up frame 1 pattern.

Wakeup Frame 1 Byte Mask 3 Register (0x4A – 0x4B): WF1BM3

This register contains the last 16 bytes mask values of the Wake up frame 1 pattern. Setting bit 0 selects the 49th byte

of the Wake up frame 1. Setting bit 15 selects the 64th byte of the Wake up frame 1.

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Bit Default Value R/W Description

15-0 0x0000 RW WF1BM3

Wake-up frame 1 Byte Mask 3.

The last 16 bytes mask covering bytes 49 to 64 of a Wake-up frame 1 pattern.

0x4C – 0x4F: Reserved

Wakeup Frame 2 CRC0 Register (0x50 – 0x51): WF2CRC0

This register contains the expected CRC values of the Wake up frame 2 pattern.

The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in

the wake up byte mask registers.

Bit Default Value R/W Description

15-0 0x0000 RW WF2CRC0

Wake-up frame 2 CRC (lower 16 bits). The expecte d CRC value of a Wake-up frame 2

pattern.

Wakeup Frame 2 CRC1 Register (0x52 – 0x53): WF2CRC1

This register contains the expected CRC values of the wake-up frame 2 pattern.

The value of the CRC calculated is based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in

the wake up byte mask registers.

Bit Default Value R/W Description

15-0 0x0000 RW WF2CRC1

Wake-up frame 2 CRC (upper 16 bits). The expected CRC value of a W ake-up frame 2

pattern.

Wakeup Frame 2 Byte Mask 0 Register (0x54 – 0x55): WF2BM0

This register contains the first 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the first byte

of the Wake up frame 2, setting bit 15 selects the 16th byte of the Wake up frame 2.

Bit Default Value R/W Description

15-0 0x0000 RW WF2BM0

Wake-up frame 2 Byte Mask 0. The first 16 bytes mask of a Wake-up frame 2 pattern.

Wakeup Frame 2 Byte Mask 1 Register (0x56 – 0x57): WF2BM1

This register contains the next 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the 17th byte

of the Wake up frame 2. Setting bit 15 selects the 32nd byte of the Wake up frame 2.

Bit Default Value R/W Description

15-0 0x0000 RW WF2BM1

Wake-up frame 2 Byte Mask 1. The next 16 bytes mask covering bytes 17 to 32 of a

Wake-up frame 2 pattern.

Wakeup Frame 2 Byte Mask 2 Register (0x58 – 0x59): WF2BM2

This register contains the next 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the 33rd byte

of the Wake up frame 2. Setting bit 15 selects the 48th byte of the Wake up frame 2.

Bit Default Value R/W Description

15-0 0 RW WF2BM2

Wake-up frame 2 Byte Mask 2. The next 16 bytes mask covering bytes 33 to 48 of a

Wake-up frame 2 pattern.

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Wakeup Frame 2 Byte Mask 3 Register (0x5A – 0x5B): WF2BM3

This register contains the last 16 bytes mask values of the Wake up frame 2 pattern. Setting bit 0 selects the 49th byte

of the Wake up frame 2. Setting bit 15 selects the 64th byte of the Wake up frame 2.

Bit Default Value R/W Description

15-0 0 RW WF2BM3

Wake-up frame 2 Byte Mask 3. The last 16 bytes mask covering bytes 49 to 64 of a

Wake-up frame 2 pattern.

0x5C – 0x5F: Reserved

Wakeup Frame 3 CRC0 Register (0x60 – 0x61): WF3CRC0

This register contains the expected CRC values of the Wake up frame 3 pattern. The value of the CRC calculated is

based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in the wake-up byte mask registers.

Bit Default Value R/W Description

15-0 0 RW WF3CRC0

Wake-up frame 3 CRC (lower 16 bits). The expected CRC value of a Wake up frame 3

pattern.

Wakeup Frame 3 CRC1 Register (0x62 – 0x63): WF3CRC1

This register contains the expected CRC values of the Wake up frame 3 pattern. The value of the CRC calculated is

based on the IEEE 802.3 Ethernet standard, it is taken over the bytes specified in

the wake-up byte mask registers.

Bit Default Value R/W Description

15-0 0 RW WF3CRC1

Wake-up frame 3 CRC (upper 16 bits). The expected CRC value of a Wake up frame 3

pattern.

Wakeup Frame 3 Byte Mask 0 Register (0x64 – 0x65): WF3BM0

This register contains the first 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the first byte

of the Wake up frame 3, setting bit 15 selects the 16th byte of the Wake up frame 3.

Bit Default Value R/W Description

15-0 0 RW WF3BM0

Wake up Frame 3 Byte Mask 0. The first 16 byte mask of a Wake up frame 3 pattern.

Wakeup Frame 3 Byte Mask 1 Register (0x66 – 0x67): WF3BM1

This register contains the next 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the 17th byte

of the Wake up frame 3. Setting bit 15 selects the 32nd byte of the Wake up frame 3.

Bit Default Value R/W Description

15-0 0 RW WF3BM1

Wake up Frame 3 Byte Mask 1. The next 16 bytes mask covering bytes 17 to 32 of a

Wake up frame 3 pattern.

Wakeup Frame 3 Byte Mask 2 Register (0x68 – 0x69): WF3BM2

This register contains the next 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the 33rd byte

of the Wake up frame 3. Setting bit 15 selects the 48th byte of the Wake up frame 3.

Bit Default Value R/W Description

15-0 0 RW WF3BM2

Wake up Frame 3 Byte Mask 2. The next 16 bytes mask covering bytes 33 to 48 of a

Wake up frame 3 pattern.

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Wakeup Frame 3 Byte Mask 3 Register (0x6A – 0x6B): WF3BM3

This register contains the last 16 bytes mask values of the Wake up frame 3 pattern. Setting bit 0 selects the 49th byte

of the Wake up frame 3. Setting bit 15 selects the 64th byte of the Wake up frame 3.

Bit Default Value R/W Description

15-0 0 RW WF3BM3

Wake up Frame 3 Byte Mask 3. The last 16 bytes mask covering bytes 49 to 64 of a

Wake up frame 3 pattern.

0x6C – 0x6F: Reserved

Transmit Control Register (0x70 – 0x71): TXCR

This register holds control information programmed by the CPU to control the QMU transmit module function.

Bit Default Value R/W Description

15-9 - RO Reserved

8 0x0 RW

TCGICMP Transmit Checksum Generation for ICMP

When this bit is set, The KSZ8851SNL is enabled to transmit ICMP frame (only for non-

fragment frame) checksum generation.

7 0x0 RO

Reserved

6 0x0 RW

TCGTCP Transmit Checksum Generation for TCP

When this bit is set, The KSZ8851SNL is enabled to transmit TCP frame checksum

generation.

5 0x0 RW

TCGIP Transmit Checksum Generation for IP

When this bit is set, The KSZ8851SNL is enabled to transmit IP header checksum

generation.

4 0x0 RW

FTXQ Flush Transmit Queue

When this bit is set, The transmit queue memory is cleared and TX frame pointer is reset.

Note: Disable the TXE transmit enable bit[0] first before set this bit, then clear this bit to

normal operation.

3 0x0 RW

TXFCE Transmit Flow Control Enable

When this bit is set and the KSZ8851SNL is in full-duplex mode, flow control is enabled.

The KSZ8851SNL transmits a PAUSE frame when the Receive Buffer capacity reaches a

threshold level that will cause the buffer to overflow.

When this bit is set and the KSZ8851SNL is in half-duplex mode, back-pressure flow

control is enabled. When this bit is cleared, no transmit flow control is enabled.

2 0x0 RW

TXPE Transmit Padding Enable

When this bit is set, the KSZ8851SNL automatically adds a padding field to a packet

shorter than 64 bytes.

Note: Setting this bit requires enabling the add CRC feature (bit1=1) to avoid CRC errors

for the transmit packet.

1 0x0 RW

TXCE Transmit CRC Enable

When this bit is set, the KSZ8851SNL automatically adds a 32-bit CRC checksum field to

the end of a transmit frame.

0 0x0 RW

TXE Transmit Enable

When this bit is set, the transmit module is enabled and placed in a running state. When

reset, the transmit process is placed in the stopped state after the transmission of the

current frame is completed.

Transmit Status Register (0x72 – 0x73): TXSR

This register keeps the status of the last transmitted frame.

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Bit Default Value R/W Description

15-14 0x0 RO Reserved

13 0x0 RO

TXLC Transmit Late Collision

This bit is set when a transmit Late Collision occurs.

12 0x0 RO

TXMC Transmit Maximum Collision

This bit is set when a transmit Maximum Collision is reached.

11-6 - RO Reserved

5-0 - RO

TXFID Transmit Frame ID

This field identifies the transmitted frame. All of the transmit status information in this

Receive Control Register 1 (0x74 – 0x75): RXCR1

This register holds control information programmed by the CPU to control the receive function.

Bit Default Value R/W Description

15 0x0 RW

FRXQ Flush Receive Queue

When this bit is set, The receive queue memory is cleared and RX frame pointer is reset.

Note: Disable the RXE receive enable bit[0] first before set this bit, then clear this bit to

normal operation.

14 0x0 RW

RXUDPFCC Receive UDP Frame Checksum Check Enable

When this bit is set, the KSZ8851SNL will check for correct UDP checksum for incoming

UDP frames. Any received UDP frames with incorrect checksum will be discarded.

13 0x0 RW

RXTCPFCC Receive TCP Frame Checksum Check Enable

When this bit is set, the KSZ8851SNL will check for correct TCP checksum for incoming

TCP frames. Any received TCP frames with incorrect checksum will be discarded.

12 0x0 RW

RXIPFCC Receive IP Frame Checksum Check Enable

When this bit is set, the KSZ8851SNL will check for correct IP header checksum for

incoming IP frames. Any received IP frames with incorrect checksum will be discarded.

11 0x1 RW

RXPAFMA Receive Physical Address Filtering with MAC Address Enable

When this bit is set, this bit enables the RX function to receive physical address that pass

the MAC address filtering mechanism (see Address Filtering Scheme in Table 3 for

detail).

10 0x0 RW

RXFCE Receive Flow Control Enable

When this bit is set and the KSZ8851SNL is in full-duplex mode, flow control is enabled,

and the KSZ8851SNL will acknowledge a PAUSE frame from the receive interface; i.e.,

the outgoing packets are pending in the transmit buffer until the PAUSE frame contro l

timer expires. This field has no meaning in half-duplex mode and should be programmed

to 0.

When this bit is cleared, flow control is not enabled.

9 0x0 RW

RXEFE Receive Error Frame Enable

W hen this bit is set, CRC error frames are allowed to be received into the RX queue.

When this bit is cleared, all CRC error frames are discarded.

8 0x0 RW

RXMAFMA Receive Multicast Address Filtering with MAC Address Enable

When this bit is set, this bit enables the RX function to receive multicast address that pass

the MAC address filtering mechanism (see Address Filtering Scheme in Table 3 for

detail).

7 0x0 RW

RXBE Receive Broadcast Enable

When this bit is set, the RX module receives all the broadcast frames.

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Bit Default Value R/W Description

6 0x0 RW

RXME Receive Multicast Enable

When this bit is set, the RX module receives all the multicast frames (including broadcast

frames).

5 0x0 RW

RXUE Receive Unicast Enable

When this bit is set, the RX module receives unicast frames that match the 48-bit Station

MAC address of the module.

4 0x0 RW

RXAE Receive All Enable

When this bit is set, the KSZ8851SNL receives all incoming frames , regardless of the

frame’s destination address (see Address Filtering Scheme in Table 3 for detail).

3 0x0 RW

Reserved

2 0x0 RW

Reserved

1 0x0 RW

RXINVF Receive Inverse Filtering

When this bit is set, the KSZ8851SNL receives function with address check operation in

inverse filtering mode (see Address Filtering Scheme in Table 3 for detail).

0 0x0 RW

RXE Receive Enable

When this bit is set, the RX block is enabled and placed in a running state.

When this bit is cleared, the receive process is placed in the stopped state upon

completing reception of the current frame.

Receive Control Register 2 (0x76 – 0x77): RXCR2

This register holds control information programmed by the CPU to control the receive function.

Bit Default Value R/W Description

15-8 - RO Reserved

7-5 0x0 WO

SRDBL SPI Receive Data Burst Length

These three bi ts are used to define for SPI receive data burst length during DMA

operation from the host CPU to access RXQ frame buffer.

000: 4 Bytes data burst 001: 8 Bytes data burst

010: 16 Bytes data burst 011: 32 Bytes data burst

100: Single frame data burst 101-111: NA (reserved)

Note: It needs RXQ FIFO Read command byte before each data burst.

4 0x0 RW

IUFFP IPV4/IPV6/UDP Fragment Frame Pass

When this bit is set, the KSZ8851SNL will pass the checksum check at receive side for

IPv4/IPv6 UDP frame with fragment extension header.

When this bit is cleared, the KSZ8851SNL will perform checksum operation based on

configuration and doesn’t care whether it’s a fragment fram e or not.

3 0x0 RW

RXIUFCEZ Receive IPV4/IPV6/UDP Frame Checksum Equal Zero

When this bit is set, the KSZ8851SNL will pass the filtering for Ipv4/IPV6 UDP frame with

UDP checksum equal to zero.

When this bit is cleared, the KSZ8851SNL will drop IPV4/IPV6 UDP packet with UDP

checksum equal to zero.

2 0x1 RW

UDPLFE UDP Lite Frame Enable

When this bit is set, the KSZ8851SNL will check the checksum at receive side and

generate the checksum at transmit side for UDP Lite frame.

When this bit is cleared, the KSZ8851SNL will pass the checksum check at receive side

and skip the checksum generation at transmit side for UDP Lite frame.

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Bit Default Value R/W Description

1 0x0 RW

RXICMPFCC Receive ICMP Frame Checksum Check Enable

When this bit is set, the KSZ8851SNL will check for correct ICMP checksum for incoming

ICMP frames (only for non-fragment frame). Any received ICMP frames with incorrect

checksum will be discarded.

0 0x0 RW

RXSAF Receive Source Address Filtering

When this bit is set, the KSZ8851SNL will drop the frame if the source address is same as

MAC address in MARL, MARM, MARH registers.

TXQ Memory Information Register (0x78 – 0x79): TXMIR

This register indicates the amount of free memory available in the TXQ of the QMU module.

Bit Default Value R/W Description

15-13 - RO Reserved

12-0 - RO TXMA Transmit Memory Available

The amount of memory available is represented in units of byte. The TXQ memory is

used for both frame payload, control word.

Note: Software must be written to ensure that there is enough memory for the next

transmit frame including control information before transmit data is written to the TXQ.

0x7A – 0x7B: Reserved

Receive Frame Header Status Register (0x7C – 0x7D): RXFHSR

This register indicates the received frame header status information, the received frames are reported in RXFCTR

as the frame count value in the RXFCTR.

Bit Default Value R/W Description

15 - RO

RXFV Receive Frame Valid

When this bit is set, it indicates that the present frame in the receive packet memory is

valid. The status information currently in this location is also valid.

When clear, it indicates that there is either no pending receive frame or that the current

frame is still in the proce ss of receiv i ng.

14 - RO

Reserved

13 - RO

RXICMPFCS Receive ICMP Frame Checksum Status

When this bit is set, the KSZ8851SNL received ICMP frame checksum field is incorrect.

12 - RO

RXIPFCS Receive IP Frame Checksum Status

When this bit is set, the KSZ8851SNL received IP header checksum field is incorrect.

11 - RO

RXTCPFCS Receive TCP Frame Checksum Status

When this bit is set, the KSZ8851SNL received TCP frame checksum field is incorrect.

10 - RO

RXUDPFCS Receive UDP Frame Checksum Status

When this bit is set, the KSZ8851SNL received UDP frame checksum field is incorrect.

9-8 - RO

Reserved

7 - RO

RXBF Receive Broadcast Frame

When this bit is set, it indicates that this frame has a broadcast address.

6 - RO

RXMF Receive Multicast Frame

When this bit is set, it indicates that this frame has a multicast address (including the

broadcast address).

5 - RO

RXUF Receive Unicast Frame

When this bit is set, it indicates that this frame has a unicast address.

4 - RO

RXMR Receive MII Error

When set, it indicates that there is an MII symbol error on the received frame.

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Bit Default Value R/W Description

3 - RO

RXFT Receive Frame Type

When this bit is set, it indicates that the fram e is an Ethernet-type frame (frame length is

greater than 1500 bytes). When clear, it indicates that the frame is an IEEE 802.3 frame.

This bit is not valid for runt frames.

2 - RO

RXFTL Receive Frame Too Long

When this bit is set, it indicates that the frame length exceeds the maximum size of 2000

bytes. Frames that are too long are passed to the host only if the pass bad frame bit is

set.

Note: Frame too long is only a frame length indication and does not cause any frame

truncation.

1 - RO

RXRF Receive Runt Frame

When this bit is set, it indicates that a frame was damaged by a collision or had a

premature termination before the collision window passed.

Runt frames are passed to the host only if the pass bad frame bit is set.

0 - RO

RXCE Receive CRC Error

W hen this bit is set, it indicates that a CRC error has occurred on the current received

frame.

CRC error frames are passed to the host only if the pass bad frame bit is set.

Receive Frame Header Byte Count Register (0x7E – 0x7F): RXFHBCR

This register indicates the received frame header byte count information, the received frames are reported in RXFCTR

many times same as the frame count value in the RXFCTR.

Bit Default Value R/W Description

15-12 - RO Reserved

11-0 - RO RXBC Receive Byte Count

This field indicates the present received frame byte size.

TXQ Command Register (0x80 – 0x81): TXQCR

This register is programmed by the Host CPU to issue a transmit command to the TXQ. The present transmit frame in

the TXQ memory is queued for transmit.

Bit Default Value R/W Description

15-3 - RW Reserved

2 0x0 RW

AETFE Auto-Enqueue TXQ Frame Enable

When this bit is written as 1, the KSZ8851SNL will enable current all TX frames prepared

in the TX buffer are queued to transmit automatically.

The bit 0 METFE has to be set 0 when this bit is set to 1 in this register.

1 0x0 RW

TXQMAM TXQ Memory Available Monitor

When this bit is written as 1, the KSZ8851SNL will generate interrupt (bit 6 in ISR register)

to CPU when TXQ memory is available based upon the total amount of TXQ space

requested by CPU at TXNTFSR (0x9E) register.

Note: This bit is self-clearing after the frame is finished transmitting. The software should

wait for the bit to be cleared before set to 1 again.

0 0x0 RW

METFE Manual Enqueue TXQ Frame Enable

When this bit is written as 1, the KSZ8851SNL will enable current TX frame prepared in

the TX buffer is queued for transmit, this is only transmit one frame at a time.

Note: This bit is self-clearing after the frame is finished transmitting. The software should

wait for the bit to be cleared before setting up another new TX frame.

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RXQ Command Register (0x82 – 0x83): RXQCR

This register is programmed by the Host CPU to issue DMA read or write command to the RXQ and TXQ. This register

also is used to control all RX thresholds enable and status.

Bit Default Value R/W Description

15-13 - RW Reserved

12 - RO

RXDTTS RX Duration Timer Threshold Status

When this bit is set, it indicates that RX interrupt is due to the time start at first received

frame in RXQ buffer exceeds the threshold set in RX Duration Timer Threshold Register

(0x8C, RXDTT).

This bit will be updated when write 1 to bit 13 in ISR register.

11 - RO

RXDBCTS RX Data Byte Count Threshold Status

When this bit is set, it indicates that RX interrupt is due to the number of received bytes in

RXQ buffer exceeds the threshold set in RX Da ta Byte Count Threshold Register (0x8E,

RXDBCT).

This bit will be updated when write 1 to bit 13 in ISR register.

10 - RO

RXFCTS RX Frame Count Threshold Status

When this bit is set, it indicates that RX interrupt is due to the number of received frames

in RXQ buffer exceeds the threshold set in RX Frame Count Threshold Register (0x9C,

RXFCT).

This bit will be updated when write 1 to bit 13 in ISR register.

9 0x0 RW

RXIPHTOE RX IP Header Two-Byte Offset Enable

When this bit is written as 1, the KSZ8851SNL will enable to add two bytes before frame

header in order for IP header inside the frame contents to be aligned with double word

boundary to speed up software operation.

8 - RW

Reserved

7 0x0 RW

RXDTTE RX Duration Timer Threshold Enable

When this bit is written as 1, the KSZ8851SNL will enable RX interrupt (bit 13 in ISR)

when the time start at first received frame in RXQ buffer exceeds the threshold set in RX

Duration Timer Threshold Register (0x8C, RXDTT).

6 0x0 RW

RXDBCTE RX Data Byte Count Threshold Enable

When this bit is written as 1, the KSZ8851SNL will enable RX interrupt (bit 13 in ISR)

when the number of received bytes in RXQ buffer exceeds the threshold set in RX Data

Byte Count Threshold Register (0x8E, RXDBCT).

5 0x0 RW

RXFCTE RX Frame Count Threshold Enable

When this bit is written as 1, the KSZ8851SNL will enable RX interrupt (bit 13 in ISR)

when the number of received frames in RXQ buffer exceeds the threshold set in RX

Frame Count Threshold Register (0x9C, RXFCT).

4 0x0 RW

ADRFE Auto-Dequeue RXQ Frame Enable

When this bit is written as 1, the KSZ8851SNL will automatically enable RXQ frame buffer

dequeue. The read pointer in RXQ frame buffer will be automatically adjusted to next

received frame location after current frame is completely read by the host.

3 0x0 WO

SDA Start DMA Access

When this bit is written as 1, the KSZ8851SNL allows a DMA operation from the host

CPU to access either read RXQ frame buffer or write TXQ frame buffer with SPI

command operation for RXQ/TXQ FIFO read/write (see Table 5). All registers access are

disabled except this register during this DMA operation.

This bit must be set to 0 when DMA operation is finished in order to access the rest of

registers.

2-1 - RW

Reserved

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Bit Default Value R/W Description

0 0x0 RW

RRXEF Release RX Error Frame

When this bit is written as 1, the current RX error frame buffer is released.

Note: This bit is self-clearing after the frame memory is released. The software should

wait for

the bit to be cleared before processing new RX frame.

TX Frame Data Pointer Register (0x84 – 0x85): TXFDPR

The value of this register determines the address to be accessed within the TXQ frame buffer. When the AUTO increment

is set, It will automatically increment the pointer value on write accesses to the data register.

The counter is incremented by one for every byte access, by two for every word access, and by four for every double

word access.

Bit Default Value R/W Description

15 - RO

Reserved

14 0x0 RW

TXFPAI TX Frame Data Pointer Auto Increment

When this bit is set, the TX Frame data pointer register increments automatically on

accesses to the data register. The increment is by one for every byte access, by two for

every word access, and by four for every doubleword access.

When this bit is reset, the TX frame data pointer is manually controlled by user to access

the TX frame location.

13-11 - RO Reserved

10-0 0x000 RO TXFP TX Frame Pointer

TX Frame Pointer index to the Frame Da ta register for access.

This field reset to next available TX frame location when the TX Frame Data has been

enqueued through the TXQ command register.

RX Frame Data Pointer Register (0x86 – 0x87): RXFDPR

The value of this register determines the address to be accessed within the RXQ frame buffer. When the Auto Increment

is set, it will automatically increment the RXQ Pointer on read accesses to the data register.

The counter is incremented is by one for every byte access, by two for every word access, and by four for every double

word access.

Bit Default Value R/W Description

15 - RO

Reserved

14 0x0 RW

RXFPAI RX Frame Pointer Auto Increment

When this bit is set, the RXQ Address register increments automatically on accesses to

the data register. The increment is by one for every byte access, by two for every word

access, and by four for every double word access.

When this bit is reset, the RX frame data pointer is manually controlled by user to access

the RX frame location.

13-11 - RO Reserved

10-0 0x000 WO RXFP RX Frame Pointer

RX Frame data pointer index to the Data register for access.

This pointer value must reset to 0x000 before each DMA operation from the host CPU to

read RXQ frame buffer.

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0x88 – 0x8B: Reserved

RX Duration Timer Threshold Register (0x8C – 0x8D): RXDTTR

This register is used to program the received frame duration timer threshold.

Bit Default Value R/W Description

15-0 0x0000 RW RXD TT Rec eive Durati on Ti mer Th reshol d

To program received frame duration timer threshold value in 1us interval. The maximum value is

0xCFFF.

When bit 7 set to 1 in RXQCR register, the KSZ8851SNL will set RX interrupt (bit 13 in ISR) after

the time starts at first received frame in RXQ buffer and exceeds the threshold set in this register.

RX Data Byte Count Threshold Register (0x8E – 0x8F): RXDBCTR

This register is used to program the received data byte count threshold.

Bit Default Value R/W Description

15-0 0x0000 RW RXDBCT Receive Data Byte Count Threshold

To program received data byte threshold value in byte count.

When bit 6 set to 1 in RXQCR register, the KSZ8851SNL will set RX interrupt (bit 13 in ISR)

when the number of received bytes in RXQ buffer exceeds the threshold set in this register.

Interrupt Enable Register (0x90 – 0x91): IER

This register enables the interrupts from the QMU and other sources.

Bit Default Value R/W Description

15 0x0 RW

LCIE Link Change Interrupt Enable

When this bit is set, the link change interrupt is enabled.

When this bit is reset, the link change interrupt is disabled.

14 0x0 RW

TXIE Transmit Interrupt Enable

When this bit is set, the transmit interrupt is enabled.

When this bit is reset, the transmit interrupt is disabled.

13 0x0 RW

RXIE Receive Interrupt Enable

When this bit is set, the receive interrupt is enabled.

When this bit is reset, the receive interrupt is disabled.

12 0x0 RW

Reserved

11 0x0 RW

RXOIE Receive Overrun Interrupt Enable

When this bit is set, the Receive Overrun interrupt is enabled.

When this bit is reset, the Receive Overrun interrupt is disabled.

10 0x0 RW

Reserved

9 0x0 RW

TXPSIE Transmit Process Stopped Interrupt Enable

When this bit is set, the Transmit Process Stopped interrupt is enabled.

When this bit is reset, the Transmit Process Stopped interrupt is disabled.

8 0x0 RW

RXPSIE Receive Process Stopped Interrupt Enable

When this bit is set, the Receive Process Stopped interrupt is enabled.

When this bit is reset, the Receive Process Stopped interrupt is disabled.

7 0x0 RW

Reserved

6 0x0 RW

TXSAIE Transmit Space Available Interrupt Enable

When this bit is set, the Transmit memory space available interrupt is enabled.

When this bit is reset, the Transmit memory space available interrupt is disabled.

5 0x0 RW

RXWFDIE Receive Wake-up Frame Detect Interrupt Enable

When this bit is set, the Receive wakeup frame detect interrupt is enabled.

When this bit is reset, the Receive wakeup frame detect interrupt is disabled.

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Bit Default Value R/W Description

4 0x0 RW

RXMPDIE Receive Magic Packet Detect Interrupt Enable

When this bit is set, the Receive magic packet detect interrupt is enabled.

When this bit is reset, the Receive magic packet detect interrupt is disabled.

3 0x0 RW

LDIE Linkup Detect Interrupt Enable

When this bit is set, the wake-up from linkup detect interrupt is enabled.

When this bit is reset, the linkup detect interrupt is disabled.

2 0x0 RW

EDIE Energy Detect Interrupt Enable

When this bit is set, the wake-up from energy detect interrupt is enabled.

When this bit is reset, the energy detect interrupt is disabled.

1 0x0 RW

SPIBEIE SPI Bus Error Interrupt Enable

When this bit is set, the SPI bus error interrupt is enabled.

When this bit is reset, the SPI bus error interrupt is disabled.

0 0x0 RW

DEDIE Delay Energy Detect Interrupt Enable

When this bit is set, the delay energy detect interrupt is enabled.

When this bit is reset, the delay energy detect interrupt is disabled.

Note: the delay energy detect interrupt till device is ready for host access.

Interrupt Status Register (0x92 – 0x93): ISR

This register contains the status bits for all QMU and other interrupt sources.

When the corresponding enable bit is set, it causes the interrupt pin to be asserted.

This register is usually read by the host CPU and device drivers during interrupt service routine or polling. The register

bits are not cleared when read. The user has to write “1” to clear.

Bit Default Value R/W Description

15 0x0 RO

(W1C) LCIS Link Change Interrupt Status

When this bit is set, it indicates that the link status has changed from link up to link down,

or link down to link up.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

14 0x0 RO

(W1C) TXIS Transmit Interrupt Status

When this bit is set, it indicates that the TXQ MAC has transmitted at least a frame on the

MAC interface and the QMU TXQ is ready for new frames from the host.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

13 0x0 RO

(W1C) RXIS Receive Interrupt Status

When this bit is set, it indicates that the QMU RXQ has received at least a frame from the

MAC interface and the frame is ready for the host CPU to process.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

12 0x0 RO

Reserved

11 0x0 RO

(W1C) RXOIS Receive Overrun Interrupt Status

When this bit is set, it indicates that the Receive Overrun status has occurred.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

10 0x0 RO

Reserved

9 0x1 RO

(W1C) TXPSIS Transmit Process Stopped Interrupt Status

When this bit is set, it indicates that the Transmit Process has stopped.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

8 0x1 RO

(W1C) RXPSIS Receive Process Stopped Interrupt Status

When this bit is set, it indicates that the Receive Process has stopped.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

7 0x0 RO

Reserved

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Bit Default Value R/W Description

6 0x0 RO

(W1C) TXSAIS Transmit Space Available Interrupt Status

When this bit is set, it indicates that Transmit memory space available status has

occurred.

When this bit is reset, the Transmit memory space available interrupt is disabled.

5 0x0 RO

RXWFDIS Receive Wakeup Frame Detect Interrupt Status

When this bit is set, it indicates that Receive wakeup frame detect status has occurred.

Write “1000” to PMECR[5:2] to clear this bit

4 0x0 RO

RXMPDIS Receive Magic Packet Detect Interrupt Status

When this bit is set, it indicates that Receive magic packet detect status has occurred.

Write “0100” to PMECR[5:2] to clear this bit.

3 0x0 RO

LDIS Linkup Detect Interrupt Status

When this bit is set, it indicates that wake-up from linkup detect status has occurred.

Write “0010” to PMECR[5:2] to clear this bit.

2 0x0 RO

EDIS Energy Detect Interrupt Status

When this bit is set and bit 2=1, bit 0=0 in IER register, it indicates that wake-up from

energy detect status has occurred. When this bit is set and bit 2, 0=1 in IER register, it

indicates that wake-up from delay energy de tect status has occurred.

Write “0001” to PMECR[5:2] to clear this bit.

1 0x0 RO

(W1C) SPIBEIS SPI Bus Error Interrupt Status

When th is bit is s et, it indi cates that SPI bus error status has occurred.

This edge-triggered interrupt status is cleared by writing 1 to this bit.

0 0x0 RO

Reserved

0x94 – 0x9B: Reserved

RX Frame Count & Threshold Register (0x9C – 0x9D): RXFCTR

This register indicat es the curr ent total amount of received fr ame count in RXQ fram e buffer and also is us ed to program

the received frame count threshold.

Bit Default Value R/W Description

15-8 0x00 RO RXFC RX Frame Count

To indicate the total received frames in RXQ frame buffer when receive interrupt (bit13=1

in ISR) occurred and write “1” to clear this bit 13 in ISR. The host CPU can start to read

the updated receive frame header information in RXFHSR/RXFHBCR registers after read

this RX frame count register.

7-0 0x00 RW

RXFCT Receive Frame Count Threshold

To program received frame count threshold value.

When bit 5 set to 1 in RXQCR register, the KSZ8851SNL will set RX interrupt (bit 13 in

ISR) when the number of received frames in RXQ buffer exceeds the threshold set in this

TX Next Total Frames Size Register (0x9E – 0x9F): TXNTFSR

This register is used by the host CPU to program the total amount of TXQ buffer space requested for the next transmit.

Bit Default Value R/W Description

15-0 0x0000 RW TXNTFS TX Next Total Fram es Size

The host CPU is used to program the total amount of TXQ buffer spac e which is required

for next total transmit frames size in double-word count.

When bit 1 (TXQ memory available monitor) is set to 1 in TXQCR register, the

KSZ8851SNL will generate interrupt (bit 6 in ISR register) to CPU when TXQ memory is

available based upon the total amount of TXQ space requested by CPU at this register.

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MAC Address Hash Table Register 0 (0xA0 – 0xA1): MAHTR0

The 64-bit MAC address table is used for group address filtering and it is enabled by selecting item 5 “Hash perfect” mode

in Table 3 (Address Filtering Scheme). This value is defined as the six most significant bits from CRC circuit calculation

result that is based on 48-bit of DA input. The two most significant bits select one of the four registers to be used, while

the others determine which bit within the register.

Multicast table register 0.

Bit Default Value R/W Description

15-0 0x0 RW HT0 Hash Table 0

W hen the appropriate bit is set, if the packet received with DA matches the CRC, the

hashing function is received without being filtered.

When the appropriate bit is cleared, the packet will drop.

MAC Address Hash Table Register 1 (0xA2 – 0xA3): MAHTR1

Multicast table register 1.

Bit Default Value R/W Description

15-0 0x0 RW HT1 Hash Table 1

W hen the appropriate bit is set, if the packet received with DA matches the CRC, the

hashing function is received without being filtered.

When the appropriate bit is cleared, the packet will drop.

Note: When the receive all (RXAE) or receive multicast (RXME) bit is set in the RXCR1,

all multicast addresses are received regardless of the multicast table value.

MAC Address Hash Table Register 2 (0xA4 – 0xA5): MAHTR2

Multicast table register 2.

Bit Default Value R/W Description

15-0 0x0 RW HT2 Hash Table 2

W hen the appropriate bit is set, if the packet received with DA matches the CRC, the

hashing function is received without being filtered.

When the appropriate bit is cleared, the packet will drop.

Note: When the receive all (RXAE) or receive multicast (RXME) bit is set in the RXCR1,

all multicast addresses are received regardless of the multicast table value.

MAC Address Hash Table Register 3 (0xA6 – 0xA7): MAHTR3

Multicast table register 3.

Bit Default Value R/W Description

15-0 0x0 RW HT3 Hash Table 3

W hen the appropriate bit is set, if the packet received with DA matches the CRC, the

hashing function is received without being filtered.

When the appropriate bit is cleared, the packet will drop.

Note: When the receive all (RXAE) or receive multicast (RXME) bit is set in the RXCR1,

all multicast addresses are received regardless of the multicast table value.

0xA8 – 0xAF: Reserved

Flow Control Low Watermark Register (0xB0 – 0xB1): FCLWR

This register is used to control the flow control for low watermark in QMU RX queue.

Bit Default Value R/W Description

15-12 - RW Reserved

11-0 0x0500 RW FCLWC Flow Control Low Watermark Configuration

These bits are used to define the QMU RX queue low watermark configuration. It is in

double words count and default is 5.12 KByte available buffer space out of 12 KByte.

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Flow Control High Watermark Register (0xB2 – 0xB3): FCHWR

This register is used to control the flow control for high watermark in QMU RX queue.

Bit Default Value R/W Description

15-12 - RW Reserved

11-0 0x0300 RW FCHWC Flow Control High Watermark Configuration

These bits are used to define the QMU RX queue high watermark configuration. It is in

double words count and default is 3.072 KByte available buffer space out of 12 KByte.

Flow Control Overrun Watermark Register (0xB4 – 0xB5): FCOWR

This register is used to control the flow control for overrun watermark in QMU RX queue

Bit Default Value R/W Description

15-12 - RW Reserved

11-0 0x0040 RW FCLWC Flow Control Overrun Watermark Configuration

These bits are used to define the QMU RX queue overrun watermark configuration. It is in

double words count and default is 256 Bytes available buffer space out of 12 Kbyte.

0xB6 – 0xBF: Reserved

Chip ID and Enable Register (0xC0 – 0xC1): CIDER

This register contains the chip ID and the chip enable bit.

Bit Default R/W Description

15-8 0x88 RO Family ID

Chip family ID

7-4 0x7 RO

Chip ID

0x7 is assigned to KSZ8851SNL

3-1 0x1 RO

Revision ID

0 0x0 RW

Reserved

0xC2 – 0xC5: Reserved

Chip Global Control Register (0xC6 – 0xC7): CGCR

This register contains the global control for the chip function.

Bit Default R/W Description

15-12 0x0 RW Reserved

11-10 0x2 RW Reserved

9 0x0 RW

LEDSEL0

This bit sets the LEDSEL0 selection for LED1 and LED0.

PHY port LED indicators, defined as below:

LEDSEL0

0 1

LED1 (pin32) 100BT ACT

LED0 (pin1) LINK/ACT LINK

8 0x0 R/W

Reserved

7-0 0x35 RW

Reserved

Indirect Access Control Register (0xC8 – 0xC9): IACR

This register contains the indirect control for the MIB counter (Write IACR triggers a command. Read access is

determ ined b y bit 12).

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Bit Default R/W Description

15-13 0x0 RW Reserved.

12 0x0 RW

Read Enable

1 = Read cycle is enabled (MIB counter will clear after read).

0 = No operation.

11-10 0x0 RW Table Select

00 = reserved.

01 = reserved.

10 = reserved.

11 = MIB counter selected.

9-5 - RW

Reserved

4-0 0x00 RW

Indirect Address

Bit 4-0 of indirect address for 32 MIB counter locations.

0xCA – 0xCF: Reserved

Indirect Access Data Low Register (0xD0 – 0xD1): IADLR

This register contains the indirect data (low word) for MIB counter.

Bit Default R/W Description

15-0 0x0000 RW Indirect Low Word Data

Bit 15-0 of indirect data.

Indirect Access Data High Register (0xD2 – 0xD3): IADHR

This register contains the indirect data (high word) for MIB counter.

Bit Default R/W Description

15-0 0x0000 RW Indirect High Word Data

Bit 31-16 of indirect data.

Power Management Event Control Register (0xD4 – 0xD5): PMECR

This register is used to control the KSZ8851SNL power management event, capabilities and status.

Bit Default Value R/W Description

15 - RO

Reserved

14 0 RW

PME Delay Enable

This bit is used to enable the delay of PME output pin 2 assertion.

When this bit is set to 1, the device will not assert the PME output till the device’s all

clocks are running and ready for host access.

When this bit is set to 0, the device will assert the PME output without delay.

This bit is only valid when Auto Wake-Up Enable (bit7) is set to 1 in this register.

13 0 RW

Reserved

12 0 RW

PME Output Polarity

This bit is used to control the PME output pin 2 polarity.

When this bit is set to 1, the PME output pin 2 is active high.

When this bit is set to 0, the PME output pin 2 is active low.

11-8 0x0 RW

Wake-on-LAN to PME Output Enable

These four bits are used to enable the PME output pin 2 asserted when one of these

wake-on-LAN events is detected:

Bit 11: is corresponding to receive wake-up frame.

Bit 10: is corresponding to receive magic packet.

Bit 9: is corresponding to link change from down to up.

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Bit Default Value R/W Description

Bit 8: is corresponding to signal energy detected.

When the bit is set to 1, the PME pin 2 will be asserted when a corresponding wake-on-

LAN event is occurred.

When this bit is set to 0, the PME pin 2 will be not asserted when a corresponding wake-

on-LAN event is occurred.

7 0 RW

Auto Wake-Up Enable

This bit is used to enable automatically wake-up from low power state to normal power

state in energy detect mode if carrier (signal energy) is present more than wake-up time in

GSWUTR register. During the normal power state, the device can receive and transmit

packets.

When this bit is set to 1, the auto wake-up is enabled in energy detect mode.

When this bit is set to 0, the auto wake-up is disabled in energy detect mode.

6 0 RW

Wake-Up to Normal Operation Mode

This bit is used to control the device wake-up from low power state in energy detect mode

to normal operation mode if signal energy is detected longer than the programmed wake-

up time in GSWUTR register.

When this bit is set to 1, the device will automatically go to the normal operation mode

from energy detect mode.

When this bit is set to 0, the device will not automatically go to the normal mode from

energy detect mode.

This bit is only valid when Auto Wake-Up Enable (bit7) is set to 1.

5-2 0x0 RO

(W1C) Wake-Up Event Indication

These four bits are used to indicate the KSZ8851SNL wake-up event status as below:

0000: No wake-up event.

0001: Wake-up from energy event detected. (Bit 2 also set to 1 in ISR regi ster)

0010: Wake-up from link up event detected. (Bit 3 also set to 1 in ISR register)

0100: Wake-up from magic packet event detected.

1000: Wake-up from wakeup frame event detected.

If Wake-on-LAN to PME Output Enable bit[11:8] are set, the KSZ8851SNL also asserts

the PME pin 2. These bits are cleared on power up reset or by write 1. It is not modified

by either hardware or software reset. When these bits are cleared, the KSZ8851SNL de-

asserts the PME pin.

1-0 0x0 RW

Power Management Mode

These two bits are used to control the KSZ8851SNL power management mode as below:

00: Normal Operation Mode.

01: Energy Detect Mode. (two states in this mode either low power or normal power)

10: Soft Power Down Mode.

11: Power Saving Mode.

In energy detec t mode under low power state, it can wake-up to normal operation mode

either from line or host wake-up (host CPU issues any one of registers read or write

access).

In soft power down mode, it can wake-up to normal operation mode only from host wake-

up (host CPU issues any one of registers read or write access).

Go-Sleep & Wake-Up Time Register (0xD6 – 0xD7): GSWUTR

This register contains the value which is used to control minimum Go-Sleep time period when the device from normal

power state to low power state or to control minimum Wake-Up time period when the device from low power state to

normal power state in energy detect mode.

Bit Default R/W Description

15-8 0x08 RW Wake-up Time

This value is used to control the minimum period that the energy has to be detected

consecutively before the device is waked-up from the low power state. The unit is 16ms

+/-80%, the default wake-up time is 128 ms (16ms x 8). Zero time (0x00) is not allowed

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Bit Default R/W Description

7-0 0x0C RW

Go-sleep Time

This value is used to control the minimum period that the no energy event has to be

detected consecutively before the device enters the low power state when the energy

detect mode is on. The unit is 1 sec +/-80%, the default go-s l eep time is 12 sec (1s x 12).

Zero time (0x00) is not allowed.

PHY Reset Register (0xD8 – 0xD9): PHYRR

This register contains a control bit to reset PHY block when write an “1”.

Bit Default R/W Description

15-1 - RW Reserved.

0 0 WO

(Self

clear)

PHY Reset Bit

This bit is write only and self clear after write an “1”, it is used to reset PHY block circuitry.

0xDA – 0xDF: Reserved

0xE0 – 0xE3: Reserved

PHY 1 MII-Register Basic Control Register (0xE4 – 0xE5): P1MBCR

This register contains Media Independent Interface (MII) register for port 1 as defined in the IEEE 802.3 specification.

Bit Default R/W Description Bit is same as:

15 0 RO Reserved

14 0 RW Local (far-end) loopback (llb)

1 = perform local loopback at host

(host SPI Tx -> PHY -> host SPI Rx,

see Figure 14)

0 = normal operation

13 1 RW

Force 100

1 = force 100Mbps if AN is disabled (bit 12)

0 = force 10Mbps if AN is disabled (bit 12)

Bit 6 in P1CR

12 1 RW

AN Enable

1 = auto-negotia tion enabled.

0 = auto-negotiation disabled.

Bit 7 in P1CR

11-10 0 RW Reserved

9 0 RW

Restart AN

1 = restart auto-negotiation.

0 = normal operation.

Bit 13 in P1CR

8 1 RW

Force Full Duplex

1 = force full duplex

0 = force half duplex.

if AN is disabled (bit 12) or AN is enabled but failed.

Bit 5 in P1CR

7-6 0 RO Reserved

5 1 R/W

HP_mdix

1 = HP Auto MDI-X mode.

0 = Micrel Auto MDI-X mode.

Bit 15 in P1SR

4 0 RW

Force MDI-X

1 = force MDI-X.

0 = normal operation.

Bit 9 in P1CR

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Bit Default R/W Description Bit is same as:

3 0 RW

Disable MDI-X

1 = disable auto MDI-X.

0 = normal operation.

Bit 10 in P1CR

2 0 RW

Reserved.

1 0 RW

Disable Transmit

1 = disable transmit.

0 = normal operation.

Bit 14 in P1CR

0 0 RW

Disable LED

1 = disable all LEDs.

0 = normal operation.

Bit 15 in P1CR

PHY 1 MII-Register Basic Status Register (0xE6 – 0xE7): P1MBSR

This register contains the MII register status for the chip function.

Bit Default R/W Description Bit is same as:

15 0 RO T4 Capable

1 = 100 BASE-T4 capable.

0 = not 100 BASE-T4 capable.

14 1 RO 100 Full Capable

1 = 100BASE-TX full-duplex capable.

0 = not 100BASE-TX full duplex.capable.

13 1 RO 100 Half Capable

1= 100BASE-TX half-duplex capable.

0= not 100BASE-TX half-duplex capable.

12 1 RO 10 Full Capable

1 = 10BASE-T full-duplex capable.

0 = not 10BASE-T full-duplex capable.

11 1 RO 10 Half Capable

1 = 10BASE-T half-dup lex capable.

0 = not 10BASE-T half-duplex capable.

10-7 0x0 RO Reserved.

6 0 RO

Preamble suppressed

Not supported.

5 0 RO

AN Complete

1 = auto-negotiation complete.

0 = auto-negotia tion not completed.

Bit 6 in P1SR

4 0 RO

Reserved

3 1 RO

AN Capable

1 = auto-negotia tion capable.

0 = not auto-negotiation capable.

2 0 RO

Link Status

1 = link is up; 0 = link is down. Bit 5 in P1SR

1 0 RO

Jabber test

Not supported.

0 0 RO

Extended Capable

1 = extended register capable.

0 = not extended register capable.

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PHY 1 PHY ID Low Register (0xE8 – 0xE9): PHY1ILR

This register contains the PHY ID (low) for the chip.

Bit Default R/W Description

15-0 0x1430 RO PHYID Low

Low order PHYID bits.

PHY 1 PHY ID High Register (0xEA – 0xEB): PHY1IHR

This register contains the PHY ID (high) for the chip.

Bit Default R/W Description

15-0 0x0022 RO PHYID High

High order PHYID bits.

PHY 1 Auto-Negotiation Advertisement Register (0xEC – 0xED): P1ANAR

This register contains the auto-negotiation advertisement for the PHY function.

Bit Default R/W Description Bit is same as :

15 0 RO

Not supported.

14 0 RO

Reserved

13 0 RO

Remote fault

Not supported.

12-11 0x0 RO Reserved

10 1 RW

Pause (flow control capability)

1 = advertise pause capability.

0 = do not advertise pause capability.

Bit 4 in P1CR

9 0 RW

Reserved.

8 1 RW

Adv 100 Full

1 = advertise 100 full-duplex capability.

0 = do not advertise 100 full-duplex capability

Bit 3 in P1CR

7 1 RW

Adv 100 Half

1= advertise 100 half-dup lex capability .

0 = do not advertise 100 half-duplex capability.

Bit 2 in P1CR

6 1 RW

Adv 10 Full

1 = advertise 10 full-duplex capability.

0 = do not advertise 10 full-duplex capability.

Bit 1 in P1CR

5 1 RW

Adv 10 Half

1 = advertise 10 half-duplex capability.

0 = do not advertise 10 half-duplex capability.

Bit 0 in P1CR

4-0 0x01 RO Selector Field

802.3

PHY 1 Auto-Negotiation Link Partner Ability Register (0xEE – 0xEF): P1ANLPR

This register contains the auto-negotiation link partner ability for the chip function.

Bit Default R/W Description Bit is same as :

15 0 RO

Not supported.

14 0 RO

LP ACK

Not supported.

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Bit Default R/W Description Bit is same as :

13 0 RO

Remote fault

Not supported.

12-11 0x0 RO Reserved

10 0 RO

Pause

Link partner pause capability. Bit 4 in P1SR

9 0 RO

Reserved.

8 0 RO

Adv 100 Full

Link partner 100 full capability. Bit 3 in P1SR

7 0 RO

Adv 100 Half

Link partner 100 half capability. Bit 2 in P1SR

6 0 RO

Adv 10 Full

Link partner 10 full capability. Bit 1 in P1SR

5 0 RO

Adv 10 Half

Link partner 10 half capability. Bit 0 in P1SR

4-0 0x01 RO Reserved

0xF0 – 0xF3: Reserved

Port 1 PHY Special Control/Status, LinkMD (0xF4 – 0xF5): P1SCLMD

This register contains the special control, status and LinkMD information of PHY1.

Bit Default R/W Description Bit is same as:

15 0 RO

Reserved

14-13 0x0 RO Vct_result

VCT result.

[00] = normal conditi on.

[01] = open condition has been detected in cable.

[10] = short condition has been detected in cable.

[11] = cable diagnostic test is failed.

12 0 RW

(Self-

Clear)

Vct_en

Vct enable.

1 = the cable diagnostic test is enabled. It is self-cleared

after the VCT test is done.

0 = it indicates the cable diagn ostic test is comple ted and

the status information is valid for read.

11 0 RW

Force_lnk

Force link.

1 = force link pass; 0 = normal operation.

10 0 RO

Reserved

9 0 RW

Remote (Near-end) loopback (rlb)

1 = perform remote loopback at PHY (RXP/RXM ->

TXP/TXM, see Figure 14)

0 = normal operation

8-0 0x000 RO Vct_fault_count

VCT fault count.

Distance to the fault. It’s approximately

0.4m*vct_fault_count.

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Port 1 Control Register (0xF6 – 0xF7): P1CR

This register contains the global per port control for the chip function.

Bit Default R/W Description Bit is same as :

15 0 RW

LED Off

1 = Turn off all of the port 1 LEDs (P1LED3, P1LED2,

P1LED1, P1LED0). These pins are driven high if this bit is

set to one.

0 = normal operation.

Bit 0 in P1MBCR

14 0 RW

Txids

1 = disable the port’s transmitter.

0 = normal operation.

Bit 1 in P1MBCR

13 0 RW

Restart AN

1 = restart auto-negotiation.

0 = normal operation.

Bit 9 in P1MBCR

12 0 RW

Reserved

11 0 RW

Reserved

10 0 RW

Disable auto MDI/MDI-X

1 = disable auto MDI/MDI-X function.

0 = enable auto MDI/MDI-X function.

Bit 3 in P1MBCR

9 0 RW

Force MDI-X

1= if auto MDI/MDI-X is disabled, force PHY into MDI-X

mode.

0 = do not force PHY into MDI-X mode.

Bit 4 in P1MBCR

8 0 RW

Reserved

7 1 RW

Auto Negotiation Enable

1 = auto negotiation is enabled.

0 = disable auto negotiation, speed, and duplex are decided

by bits 6 and 5 of the same register.

Bit 12 in P1MBCR

6 1 RW

Force Speed

1 = force 100BT if AN is disabled (bit 7).

0 = force 10BT if AN is disabled (bit 7).

Bit 13 in P1MBCR

5 1

RW Force Duplex

1 = force full duplex if (1) AN is disabled or (2) AN is

enabled but failed.

0 = force half duplex if (1) AN is disabled or (2) AN is

enabled but failed.

Bit 8 in P1MBCR

4 1 RW

Advertised flow control capability.

1 = advertise flow control (pause) capability.

0 = suppress flow control (pause) capability from

transmission to link partner.

Bit 10 in P1ANAR

3 1 RW

Advertised 100BT full-duplex capability.

1 = advertise 100BT full-duplex capability.

0 = suppress 100BT full-duplex capability from transmission

to link partner.

Bit 8 in P1ANAR

2 1 RW

Advertised 100BT half-duplex capability.

1 = advertise 100BT half-duplex capability.

0 = suppress 100BT half-duplex capability from transmission

to link partner.

Bit 7 in P1ANAR

1 1 RW

Advertised 10BT full-duplex capability. Bit 6 in P1ANAR

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Bit Default R/W Description Bit is same as :

1 = advertise 10BT full-duplex capability.

0 = suppress 10BT full-duplex capability from transmission

to link partner.

0 1 RW

Advertised 10BT half-duplex capability.

1 = advertise 10BT half-duplex capability.

0 = suppress 10BT half-duplex capability from transmission

to link partner.

Bit 5 in P1ANAR

Port 1 Status Register (0xF8 – 0xF9): P1SR

This register contains the PHY port status for the chip function.

Bit Default R/W Description Bit is same as :

15 1 RW

HP_mdix

1 = HP Auto MDI-X mode.

0 = Micrel Auto MDI-X mode.

Bit 5 in P1MBCR

14 0 RO

Reserved

13 0 RO

Polarity Reverse

1 = polarity is reversed.

0 = polarity is not reversed.

12-11 0 RO Reserved

10 0 RO

Operation Speed

1 = link speed is 100Mbps.

0 = link speed is 10Mbps.

9 0 RO

Operation Duplex

1 = link duplex is full.

0 = link duplex is half.

8 0 RO

Reserved

7 1 RO

MDI-X status

1 = MDI.

0 = MDI-X.

6 0 RO

AN Done

1 = AN done.

0 = AN not done.

Bit 5 in P1MBSR

5 0 RO

Link Good

1= link good.

0 = link not good.

Bit 2 in P1MBSR

4 0 RO

Partner flow control capability.

1 = link partner flow control (pause) capable.

0 = link partner not flow control (pause) capable.

Bit 10 in P1ANLPR

3 0 RO

Partner 100BT full-duplex capability.

1 = link partner 100BT full-duplex capable.

0 = link partner not 100BT full-duplex capable.

Bit 8 in P1ANLPR

2 0 RO

Partner 100BT half-duplex capability.

1 = link partner 100BT half-duplex capable.

0= link partner not 100BT half-duplex capable.

Bit 7 in P1ANLPR

1 0 RO

Partner 10BT full-duplex capability.

1= link partner 10BT full-duplex capable.

0 = link partner not 10BT full-duplex capable.

Bit 6 in P1ANLPR

0 0 RO

Partner 10BT half-duplex capability. Bit 5 in P1ANLPR

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Bit Default R/W Description Bit is same as :

1 = link partner 10BT half-duplex capable.

0 = link partner not 10BT half-duplex capable.

0xFA – 0xFF: Reserved

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MIB (Management Information Base) Counters

The KSZ8851SNL provides 32 MIB counters to monitor the port activity for network management. The MIB counters are

formatted as shown below.

Bit Name R/W Description Default

31-0 Counter values RO Counter value (read clear) 0x00000000

Table 13. Format of MIB Counters

Ethernet port MIB counters are read using indirect memory access. The address offset range is 0x00 to 0x1F.

Offset Counter Name Description

0x0 RxByte Rx octet count including bad packets

0x1 Reserved Reserved.

0x2 RxUndersizePkt Rx undersize packets w/ good CRC

0x3 RxFragments Rx fragment packets w/ bad CRC, symbol errors or alignment errors

0x4 RxOversize Rx oversize packets w/ good CRC (max: 1536 bytes)

0x5 RxJabbers Rx packets longer than 1536 bytes w/ either CRC errors, alignment errors, or symbol errors

0x6 RxSymbolError Rx packets w/ invalid data symbol and legal packet size.

0x7 RxCRCError Rx packets within (64,2000) bytes w/ an integral number of bytes and a bad CRC

0x8 RxAlignmentError Rx packets within (64,2000) bytes w/ a non-integral number of bytes and a bad CRC

0x9 RxControl8808Pkts Number of MAC control frames received by a port with 88-08h in EtherType field

0xA RxPausePkts Number of PAUSE frames received by a port. PAUSE frame is qualified with EtherType (88-

08h), DA, control opcode (00-01), data length (64B min), and a valid CRC

0xB RxBroadcast Rx good broadcast packets (not including error broadcast packets or valid multicast packets)

0xC RxMulticast Rx good multicast packets (not including MAC control frames, error multicast packets or valid

broadcast packets)

0xD RxUnicast Rx good unicast packets

0xE Rx64Octets Total Rx packets (bad packets included) that were 64 octets in length

0xF R x65to127Octets Total Rx packets (bad packets included) that are between 65 and 127 octets in length

0x10 Rx128to255Octets Total Rx packets (bad packets included) that are between 128 and 255 octets in length

0x11 Rx256to511Octets Total Rx packets (bad packets included) that are between 256 and 511 octets in length

0x12 Rx512to1023Octets Total Rx packets (bad packets included) that are between 512 and 1023 octets in length

0x13 Rx1024to1521Octets Total Rx packets (bad packets included) that are between 1024 and 1521 octets in length

0x14 Rx1522to2000Octets Total Rx packets (bad packets included) that are between 1522 and 2000 octets in length

0x15 TxB yte Tx good octet count, including PAUSE packets

0x16 TxLateCollision The number of times a collision is detected later than 512 bit-times into the Tx of a packet

0x17 TxPausePkts Number of PAUSE frames transmitted by a port

0x18 TxBroadcastPkts Tx good broadcast packets (not including error broadcast or valid mult ica st packet s)

0x19 TxMulticastPkts Tx good multicast packets (not including error multicast packets or valid broadcast packets)

0x1A TxUnicastPkts Tx good unicast packets

0x1B TxDeferred Tx packets by a port for which the 1st Tx attempt is delayed due to the busy medium

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Offset Counter Name Description

0x1C TxTotalCollision Tx total collision, half duplex only

0x1D TxExcessiveCollision A count of frames for which Tx fails due to excessive collisions

0x1E TxSingleCollision Successfully Tx frames on a port for wh ich Tx is inhibited by exactly one collision

0x1F TxMultipleCollision Successfully Tx frames on a port for which Tx is inhibited by more than one collision

Table 14. Port 1 MIB Counters Indirect Memory Offsets

Example:

1. MIB Counter Read (read port 1 “Rx64Octets” counter at indirect address offset 0x0E)

Write to reg. IACR (0xC8) with 0x1C0E (set indirect address and trigger a read MIB counters operation)

Then

Read reg. IADHR (MIB counter value 31-16)

Read reg. IADLR (MIB counter value 15-0)

A dditional MIB Information

In the heaviest c ondition, t he byte counter will overflo w in 2 minutes. It is rec omm ended that the softwar e read all

the counters at least every 30 seconds.

MIB counters are designed as “read clear”. That is, these counters will be cleared after they are read.

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Absolute Maximum Ratings(1)

Supply Voltage (VDD_A3.3, VDD_IO).........–0.5V to +4.0V

Input Voltage (All Inputs)..............................–0.5V to +4.0V

Output Voltage (All Outputs)........................–0.5V to +4.0V

Lead Temperature (soldering, 20sec.).......................260°C

Storage Temperature (Ts).........................–65°C to +150°C

Maximum Junction Temperature (TJ).......................+125°C

HBM ESD Rating .......................................................... 6KV

Operating Ratings(2)

Suppl y Voltag e

VDD_A3.3 ..........................................+3.1V to +3.5V

VDD_IO (3.3V)...................................+3.1V to +3.5V

VDD_IO (2.5V) ...............................+2.35V to +2.65V

VDD_IO (1.8V)...................................+1.7V to +1.9V

Ambient Operating Temperature (TA)

Commercial (SNL)…………….……………...0°C to +70°C

Industrial ( SNLI)… ……… … ….…………...-40°C to +85 ° C

Thermal Resistance(3)

Junction-to-Ambient (θJA) ...............................34°C/W

Junction-to-Case (θJC)......................................6°C/W

Electrical Characteristics(4, 5)

Symbol Parameter Condition Min Typ Max Units

Supply Current for 100BASE-TX Operation (Single Port@100% Utilization)

VDD_A3.3, VDD_IO = 3.3V; Chip only (no

transformer) 85 mA

VDD_A3.3=3.3V, VDD_IO = 2.5V; Chip only

(no transformer) 85 mA

Idd1 100BASE-TX

(analog core + PLL + digital

core + transceiver + digital I/O)

VDD_A3.3=3.3V, VDD_IO = 1.8V; Chip only

(no transformer) 85 mA

Supply Current for 10BASE-T Operation ( Single Port@100% Utilization)

VDD_A3.3, VDD_IO = 3.3V; Chip only (no

transformer) 75 mA

VDD_A3.3=3.3V, VDD_IO = 2.5V; Chip only

(no transformer) 75 mA

Idd2 10BASE-T

(analog core + PLL + digital

core + transceiver + digital I/O)

VDD_A3.3=3.3V, VDD_IO = 1.8V; Chip only

(no transformer) 75 mA

Power Management Mode

Idd3 Power Saving Mode(6) Ethernet cable disconnected & Auto-Neg 70 mA

Idd4 Soft Power Down Mode Set Bit [1:0] = 10 in PMECR register 2 mA

Idd5 Energy Detect Mode At low power state 2 mA

TTL Inputs (VDD_IO = 3.3V/2.5V/1.8V)

VIH Input High Voltage 2.0/2.0

/1.3 V

VIL Input Low Voltage 0.8/0.6

/0.3 V

IIN Input Current VIN = GND ~ VDD_IO -10 10 µA

TTL Outputs (VDD_IO = 3.3V/2.5V/1.8V)

VOH Output High Voltage IOH = -8mA 2.4/1.9

/1.5 V

VOL Output Low Voltage IOL = 8mA 0.4/0.4

/0.2 V

|IOZ| Output Tri-state Leakage 10 µA

Notes:

1. Exceeding the absolute maximum rating may damage the device.

2. The device is not guaranteed t o functi on outside its operating rating. Unused inputs must always be tied to a appropriate logic voltage l evel (Ground

to VDD_IO).

3. No (HS) heat spreader i n this package. The θJC/θJA is under air velocity 0m/s.

4. TA = 25°C. Specification f or packaged product onl y.

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Electrical Characteristics(4, 5)

Symbol Parameter Condition Min Typ Max Units

100BaseTX Transmit (measured differentially after 1:1 transformer)

VO Peak Differential Output Voltage 100Ω termination on the diff. output ±0.95 ±1.05 V

Vimb Output Voltage Imbalance 100Ω termination on the diff. output 2 %

tr, / tf Rise/Fall Time 3 5 ns

Rise/Fall Time Imbalance 0 0.5 ns

Duty Cycle Distortion ±0.25 ns

Overshoot 5 %

VSET Reference Voltage of ISET 0.5 V

Output Jitter Peak-to-peak 0.7 1.4 ns

10BaseT Receive

Vsq Squelch Threshold 5MHz square wave 400 mV

10BaseT Transmit (measured differentially after 1:1 transformer)

Vp Peak Differential Output Voltage 100Ω termina tion on the differ entia l output 2.2 2.5 2.8 V

Jitter Added 100Ω termina tion on the differ ential output

(Peak-to-peak) 1.8 3.5 ns

Table 15. Electrical Characteristics

Notes:

5. Singl e Port’s transf orm er cons um es an additi onal 45mA @3.3V for 100BASE-TX and 70mA @3.3V for 10BASE-T.

6. Single Port’s transformer consumes less than 1mA during the Power Saving Mode.

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Timing Specifications

SPI Input and Output Timing

Figure 15. SPI Interface Data Input Timing

Figure 16. SPI Interface Data Output Timing

Symbol Parameter Min Typ Max Unit

fSCLK SPI Clock Frequency 40 MHz

t1 CSN active setup time 8 ns

t2 SI data input setup time 3 ns

t3 SI data input hold time 3 ns

t4 CSN active hold time 8 ns

t5 CSN disable high time 8 ns

(note) SCLK falling edge to SO data output valid 7.5 9 ns

t7 CSN inactive to SO data output invalid 1 ns

Note: The last SI data falling edge of SCLK starts output data on SO from KSZ8851SNL

Table 16. SPI Data Input and Output Timing Parameters

SCLK

CSN

High Im pedance

MSB bit LSB bit

t2 t3

1/fSCLK t4 t5

SCLK

CSN

MSB bit LSB bit

1 /

fSCLK t 5

LSB in Don’t Care

t 6 t7

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Auto Negotiation Timing

Figure 17. Auto Negotiation Timing

Timing Parameter Description Min Typ Max Unit

tBTB FLP burst to FLP burst 8 16 24 ms

tFLPW FLP burst width 2 ms

tPW Clock/Data pulse width 100 ns

tCTD Clock pulse to data pulse 55.5 64 69.5 µs

tCTC Clock pulse to clock pul se 111 128 139 µs

Number of Clock/Data pulses per burst 17 33

Table 17. Auto Negotiation Timing Parameters

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Reset Timing

As long as the stable supply voltages to reset High timing (minimum of 10ms) are met, there is no power-sequencing

requirement for the KSZ8851SNL supply voltages (3.3V).

The reset timing requirement is summarized in the Figure 18 and Table 18.

Figure 18. Reset Timing

Symbol Parameter Min Max Unit

tsr Stable supply voltages to reset High 10 ms

Table 18. Reset Timing Parameters

Supply

Voltage

RSTN

tsr

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EEPROM Timing

EESK

EECS

EED_IO

(output)

High-Z D15 D14 D13 D1 D0

An A0011

*1 Start bit

tcyc

EED_IO

(input)

Figure 19. EEPROM Read Cycle Timing Diagram

Timing Parameter Description Min Typ Max Unit

tcyc Clock cycle 0.8 (OBCR[1:0]=00 on-chip

bus speed @ 125 MHz) μs

ts Setup time 20 ns

th Hold time 20 ns

Table 19. EEPROM Timing Parameters

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Selection of Isolation Transformers

A 1:1 isolation transformer is required at the line interface. An isolatio n transformer with in tegrated comm on-mode choke

is recommended for exceeding FCC requirements.

Table 20 gives recommended transformer characteristics.

Parameter Value Test Condition

Turns ratio 1 CT : 1 CT

Open-circuit inductance (min) 350μH 100mV, 100kHz, 8mA

Leakage induct anc e (max) 0.4μH 1MHz (min)

Inter-winding capacitance (max) 12pF

D.C. resistance (max) 0.9Ω

Insertion loss (max) 1.0dB 0MHz – 65MHz

HIPOT (min) 1500Vrms

Table 20. Transformer Selection Criteria

Magnetic Manufacturer Part Number Auto MDI-X Number of Port

Pulse H1102 Yes 1

Pulse (low cost) H1260 Yes 1

Transpower HB726 Yes 1

Bel Fuse S558-5999-U7 Yes 1

Delta LF8505 Yes 1

LanKom LF-H41S Yes 1

TDK (Mag Jack) TLA-6T718 Yes 1

Table 21. Qualified Single Port Magnetics

Selection of Reference Crystal

Chacteristics Value Units

Frequency 25 MHz

Frequency tolerance (max) ±50 ppm

Load capacitan ce ( max ) 20 pF

Series resistance 40 Ω

Table 22. Typical Reference Crystal Characteristics

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Package Information

Figure 20. 32-Pin (5mm x 5mm) MLF® (QFN per JDEC) Package

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Acronyms and Glossary

BIU Bus Interface Unit The host interface function that performs code conversion,

buffering, and the like required for communications to and from a

network.

BPDU Bridge Protocol Data Unit A packet containing ports, addresses, etc. to make sure data

being passed through a bridged network arrives at its proper

destination.

CMOS Complementary Metal Oxide Semiconductor A common semiconductor manufacturing technique in which

positive and negative types of transistors are combined to form a

current gate that in turn forms an effective means of controlling

electrical current through a chip.

CRC Cyclic Redundancy Check A common technique for detecting data transmission errors. CRC

for Ethernet is 32 bits long.

Cut-through Switch A switch typically processes received packets by reading

in the full packet (storing), then processing the packet to determine

where it needs to go, then forwarding it. A cut-through switch

simply reads in the first bit of an incoming packet and forwards the

packet. Cut-through switches do not store the packet.

DA Destination Address The address to send packets.

DMA Direct Memory Access A design in which memory on a chip is controlled independently of

the CPU.

EEPROM Electronically Erasable Programmable A design in which memory on a chip can be erased by

Read-only Memory exposing it to an electrical charge.

EISA Extended Industry Standard Architecture A bus architecture designed for PCs using 80x86 processors, or

an Intel 80386, 80486 or Pentium microprocessor. EISA buses

are 32 bits wide and support multiprocessing.

EMI Electro-Magnetic Interference A naturally occurring phenomena when the electromagnetic field

of one device disrupts, impedes or degrades the electromagnetic

field of another device by coming into proximity with it. In computer

technology, computer devices are susceptible to EMI because

electromagnetic fields are a byproduct of passing electricity

through a wire. Data lines that have not been properly shielded

are susceptible to data corruption by EMI.

FCS Frame Check Sequence See CRC.

FID Frame or Filter ID Specifies the frame identifier. Alternately is the filter identifier.

IGMP Internet Group Management Protocol The protocol defined by RFC 1112 for IP multicast transmissions.

IPG Inter-Packet Gap A time delay between successive data packets mandated by the

network standard for protocol reasons. In Ethernet, the medium

has to be "silent" (i.e., no data transfer) for a short period of time

before a node can consider the network idle and start to transmit.

IPG is used to correct timing differences between a transmitter

and receiver. During the IPG, no data is transferred, and

information in the gap can be discarded or additions inserted

without impact on data integrity.

ISI Inter-Symbol Interference The disruption of transmitted code caused by adjacent pulses

affecting or interfering with each other.

ISA Industry Standard Architecture A bus architecture used in the IBM PC/XT and PC/AT.

Jumbo Packet A packet larger than the standard Ethernet packet (1500 bytes).

Large packet sizes allow for more efficient use of bandwidth, lower

overhead, less processing, etc.

MDI Medium Dependent Interface An Ethernet port connection that allows network hubs or switches

to connect to other hubs or switches without a null-modem, or

crossover, cable. MDI provides the standard interface to a

particular media (copper or fiber) and is therefore 'media

dependent.'

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MDI-X Medium Dependent Interface Crossover An Ethernet port connection that allows networked end stations

(i.e., PCs or workstations) to connect to each other using a null-

modem, or crossover, cable. For 10/100 full-duplex networks, an

end point (such as a computer) and a switch are wired so that

each transmitter connects to the far end receiver. When

connecting two computers together, a cable that crosses the TX

and RX is required to do this. With auto MDI-X, the PHY senses

the correct TX and RX roles, eliminating any cable confusion.

MIB Management Information Base The M IB comprises the management portion of network devices.

This can include things like monitoring traffic levels and faults

(statistical), and can also change operating parameters in network

nodes (static forwarding addresses).

MII Media Independent Interface The MII accesses PHY registers as defined in the IEEE 802.3

specification.

NIC Network Interface Card An expansion board inserted into a computer to allow it to be

connected to a network. Most NICs are designed for a particular

type of network, protocol, and media, although some can serve

multiple networks.

NPVID Non Port VLAN ID The Port VLAN ID value is used as a VLAN reference.

PLL Phase-Locked Loop An electronic circuit that controls an oscillator so that it maintains a

constant phase angle (i.e., lock) on the frequency of an input, or

reference, signal. A PLL ensures that a communication signal is

locked on a specific frequency and can also be used to generate,

modulate, and demodulate a signal and divide a frequency.

PME Power Management Event An occurrence that affects the directing of power to different

components of a system.

QMU Queue Management Unit Manages packet traffic between M AC/PHY interface and the

system host. The QMU has built-in packet memories for receive

and transmit functions called TXQ (Transmit Queue) and RXQ

(Receive Queue).

SA Source Address The address from which information has been sent.

TDR Time Domain Reflectometry TDR is used to pinpoint flaws and problems in underground and

aerial wire, cabling, and fiber optics. They send a signal down the

conductor and measure the time it takes for the signal -- or part of

the signal -- to return.

UTP Unshielded Twisted Pair Commonly a cable containing 4 twisted pairs of wires. The wires

are twisted in such a manner as to cancel electrical interference

generated in each wire, therefore shielding is not required.

VLAN Virtual Local Area Network A configuration of computers that acts as if all computers are

connected by the same physical network but which may be

located virtually anywhere.

MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assum ed by Micrel for its use.

Micrel reserves the right to change circuitry and specifications at any time without notificati on to the customer.

Micrel Products are not designed or authorized f or use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected t o resul t in personal i njury. Li fe support devices or systems are devices or systems that (a) are intended for surgical implant into

the body or (b) support or sustain life, and whose fail ure to perf o rm can be reasonably expected t o result i n a signific ant i njury to the user. A Purchaser’s

use or sale of Micrel Products for use in lif e support appli ances, devic es or sys tems is a Purchaser’s own risk and Purchaser agrees to fully indemnif y

Micrel for any damages result i ng from such use or sale.