SLFLDSN-256CI - SiliconTech, Inc.

Document Part Number 61000-01745-105 April 2002 Page 1

3.5-Inch Solid-State SCSI Flash Drive with Capacities from 128MB to 8GB

1.0 DESCRIPTION

The SimpleTech SCSI drive is a high-performance, solid-

state SCSI-2 device packaged in a 3.5-inch form factor with a

50-pin connector. While the media is different (the

SimpleTech drive stores data in a flash memory array

instead of magnetic or optical disks), the interface and form

factor allow for drop-in replacement or upgrade to legacy

systems.

Since there are no moving parts, the SimpleTech SCSI-2 flash

drive is highly resistant to shock, vibration, temperature and

altitude extremes. This virtually eliminates the need for

shock mounting, fans, and other mechanical sub-assemblies

that can adversely affect system reliability and availability.

The solid-state drive also provides faster random access to

data than conventional disk drives. Since the data is stored

in memory chips, the drive has no moving parts, thus seek

time and latency associated with rotating media are virtually

eliminated.

SimpleTech flash drives are designed for and excel in the

following high-availability applications:

T elecommunications and Internetworking

• Routers and Switches

• DSLAMs

• Blade Servers

• Computer Telephony Systems

• Alternatives to RAID Systems

Military/COTS

• Avionics and other On-Board Computing

• Telemetry Systems

• Field Communications Devices

Other

• Industrial Workstations

• Medical Equipment

• Test and Measurement Systems

• Mobile Computers

SLFLDSN-xxxx(E/I)

Web: www.simpletech.com

1.1 Features

• Capacities from 128MB to 8GB

• Standard Drive Form Factor of 3.5-Inch

• 50-Pin Non-Shielded Low Density Connector

• SCSI-2 Low Voltage Differential (LVD) or Single-Ended

(SE) Interface

• Jumper Selected Termination if Drive is at End of SCSI

Chain

• ID Jumpers Allows SCSI ID of 0 to 7

• +5V DC using Standard PC Power Supply Cables

• Available in Commercial, Extended, and Industrial

Operating Temperature Ranges

1.2 Ordering Information

Part Number* ................................................................ Capacity

• SLFLDSN-128C(E/I) ....................................................128MB

• SLFLDSN-256C(E/I) ....................................................256MB

• SLFLDSN-512C(E/I) ....................................................512MB

• SLFLDSN-640C(E/I) ....................................................640MB

• SLFLDSN-768C(E/I) ....................................................768MB

• SLFLDSN-1GBC(E/I) .................................................... 1 GB

• SLFLDSN-2GBC(E/I) .......................................................2GB

• SLFLDSN-3GBC(E/I) .......................................................3GB

• SLFLDSN-4GBC(E/I) .......................................................4GB

• SLFLDSN-8GBD(E/I)** ....................................................8GB

* Part numbers with the “E” suffix have an Extended

Operating Temperature Range; part numbers with the “I”

suffix have an Industrial Operating Temperature Range;

and, part numbers without the “E” or “I” suffix have a

Commercial Operating Temperature Range.

** Coming Soon.

Document Part Number 61000-01745-105 April 2002 Page 2

SCSI FLASH DRIVE

SLFLDSN-xxxx(E/I)

1.3 Specifications Overview

• Operating Temperature Range

- Commercial .................................................. 0°C to +70°C

- Extended ....................................................-25°C to +85°C

- Industrial ...................................................-40°C to +85°C

• Form Factor ................................................................ 3.5-inch

- Height ................................................................. 0.625-inch

- Width .................................................................. 4.000-inch

- Depth .................................................................. 5.427-inch

- Weight ........................................................... 18 oz (510 g)

• SCSI-2 Interface ........................................ 50-Pin SE or LVD

• Formatted Capacity ............................................ Up To 4GB

• MTBF ................................................................................. TBD

• Access Time ............................................................... < 120 µs

• SCSI-2 Burst Data Transfer Rates...........................10 MB/s

• Voltage Requirements ...............................................+5V DC

• Data Retention System ..................... Flash Memory Array

• Read Rate ................................................................. 5.4 MB/s

• Write Rate ................................................................ 4.6 MB/s

• Standby Current (Typical) ....................................... 280 mA

• Read Current (Typical) ............................................. 630 mA

• Write Current (Typical) ............................................ 750 mA

• Shock ................................................................................. TBD

• Vibration ........................................................................... TBD

1.4 Package Dimensions

Figrue 1.4 Package Dimensions

Screw specifications for mounting:

Tap 6-32 with intrusion 0.150 in max.

(10 places) 0.150 in max.

Document Part Number 61000-01745-105 April 2002 Page 3

SCSI FLASH DRIVE

SLFLDSN-xxxx(E/I)

1.5 SCSI Flash Drive Block Diagram

Figrue 1.5 SCSI Flash Drive Block Diagram

50-Pin LVD

SCSI Connector

LVD

Terminators

16-Bit SCSI

Controller

Local SRAM/

Flash

ARM7TDMI

Processor SCSI to IDE

EPLD

ATA Flash Controller

Up To 8 GB Flash

From HOST or on

bus with other

SCSI devices To Other SCSI

Devices

8 bit SCSI-2,

Single Ended or

Low Voltage Differential

Document Part Number 61000-01745-105 April 2002 Page 4

SCSI FLASH DRIVE

SLFLDSN-xxxx(E/I)

2.0 SMALL COMPUTER SYSTEMS

INTERFACE (SCSI)

The SimpleTech Flash SCSI Drive Adapter connects to an

initiator via the SCSI interface. The SCSI protocol

implemented in the drive conforms to the ANSI X3.131 -

1986 specification, the Common Command Set (CCS)

(Revision 4B).

2.1 SE- A cable (Non-Shielded) 50 Pin SCSI Connector Pin Assignment

Table 2.1 SE- A cable (Non-Shielded) 50 Pin SCSI Connector Pin Assignment

Pin Number Pin Name Pin Number Pin Name

1 DB+(0) 2 DB-(0)

3 DB+(1) 4 DB-(1)

5 DB+(2) 6 DB-(2)

7 DB+(3) 8 DB-(3)

9 DB+(4) 10 DB-(4)

11 DB+(5) 12 DB-(5)

13 DB+(6) 14 DB-(6)

15 DB+(7) 16 DB-(7)

17 DP+(0) 18 DP-(0)

19 GND 20 GND

21 DIFFSNS 22 GND

23 NC 24 NC

25 TERMPWR1 26 TERMPWR2

27 GND 28 NC

29 GND 30 GND

31 ATN+ 32 ATN-

33 GND 34 GND

35 BSY+ 36 BSY-

37 ACK+ 38 ACK-

39 RST+ 40 RST-

41 MSG+ 42 MSG-

43 SEL+ 44 SEL-

45 C/D+ 46 C/D-

47 REQ+ 48 REQ-

49 I/O+ 50 I/O-

Document Part Number 61000-01745-105 April 2002 Page 5

SCSI FLASH DRIVE

SLFLDSN-xxxx(E/I)

2.2 Signal Descriptions

BSY+/- (Busy). An OR-tied signal, asserted by the drive,

that indicates the bus is being used. It is asserted by the

arbitrator during the ARBITRATION phase, and by the

initiator and drive during the RESELECTION phase.

SEL+/- (Select). When this signal is asserted by the initiator,

along with the drive SCSI ID bit (0 through 7), it causes the

selection of the appropriate drive. The -SEL line must be

negated by the initiator after the drive asserts the BUSY line

in response to a proper selection. It is asserted by the

arbitrator in the ARBITRATION phase (initiator or drive),

and by the drive during the RESELECTION phase.

C/D+/- (Control/Data). A signal driven by the drive that

indicates whether CONTROL or DATA information is on the

data bus. Assertion indicates CONTROL.

I/O+/- (Input/Output). A signal driven by the drive that

controls the direction of data movement on the data bus.

Assertion indicates INPUT to the initiator.

MSG+/- (Message). A signal driven by the drive during the

MESSAGE phase.

REQ+/- (Request). A signal driven by the drive that

indicates a request for a data transfer.

ACK+/- (Acknowledge). A signal driven by the initiator to

indicate acknowledgment for a data transfer.

ATN+/- (Attention). A signal driven by the initiator to

indicate the ATTENTION condition, which indicates an

initiator request to enter the MESSAGE OUT phase.

RST+/- (RESET). An OR-tied signal that indicates the

RESET condition. Assertion by the initiator causes the drive

to perform a POWER ON RESET sequence. During this

sequence it executes a self-test (self-configuration) and then

returns to the IDLE condition. The -RST pulse should be at

least 25 microseconds wide to ensure proper reset of the

drive microprocessor.

DB+ [0..7] (Data Bit [0..7]). The 8-bit bidirectional data lines

are used to transfer data to and from the initiator. Bit 7 is the

most significant bit, and bits 0 through 7 are also used as

SCSI ID bits during the ARBITRATION, SELECTION and

RESELECTION phases.

DP+/- [0] (Data Parity bit [0]). Data parity is odd. Data

parity bit 0 represents odd parity for the low byte of the

SCSI data bus DB[0..7].

DIFFSNS. This signal is used to sense the bus voltage. If the

device is connected to a Single Ended Bus (SE Bus), then the

SCSI bus driver reconfigures to support the SE Bus. If the

device is connected to a Low Voltage Differential Bus (LVD

Bus), then the SCSI bus driver changes to a LVD driver. If the

device is connected to a High Voltage Differental Bus (HVD

Bus), the device isolates itself.

TERMPWR. This signal supplies bus termination power if

the drive is at the end of the SCSI chain. Termination power

is jumper selectable.