ISD-T360SB - Information Storage Devices, Inc.

 
Table of Contents
 
ISD
 
vii
 
Chapter 1ÑHARDWARE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
 
1 PIN ASSIGNMENT  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
 
1.1 Pin-Signal Assignment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-1
 
2 DESCRIPTION   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
 
2.1 Resetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2.2 Clocking  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2.3 Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-4
2.4 Power and Grounding  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-5
2.5 Memory Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-6
2.6 The Codec Interface   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
 
3 SPECIFICATIONS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
 
3.1 Absolute Maximum Ratings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-18
3.2 Electrical Characteristics   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-18
3.3 Switching Characteristics—Preliminary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-20
3.4 Synchronous Timing Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-23
3.5 Timing Diagrams   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1-25
 
Chapter 2ÑSOFTWARE   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
 
1 SYSTEM OPERATION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
 
1.1 The State Machine   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-1
1.2 Command Execution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-2
1.3 Event Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-2
1.4 Message Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-3
1.5 Tone Generation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-4
1.6 Initialization and Configuration  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-4
1.7 Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-5
 
2 PERIPHERALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
 
2.1 Microcontroller interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-5
2.2 Memory Interface  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-8
2.3 codec interface   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-9
 
3 ALGORITHM FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
 
3.1 VCD (Voice Compression and Decompression) . . . . . . . . . . . . . . . . . . . . . . .  2-10
3.2 DTMF Detection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-11
3.3 Tone and Energy Detection (Call Progress)  . . . . . . . . . . . . . . . . . . . . . . . . . . .  2-12

ISD-T360SB

viii

Voice Solutions in Silicon

™

2.3.4 Full-Duplex Speakerphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14

2.3.5 Speech Synthesis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16

2.4 VOICEDSP PROCESSOR COMMANDS—QUICK REFERENCE TABLE . . . . . . . . .2-21

2.5 COMMAND DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-24

Chapter 3ÑSCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . 3-1

3.1 APPLICATION INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

Chapter 4ÑPHYSICAL DIMENSIONS . . . . . . . . . . . . . . . . . . . 4-1

ISD · 2045 Hamilton Avenue, San Jose, CA 95125 · TEL: 408/369-2400 · FAX: 408/369-2422 · http://www.isd.com

December 1998

—Advance Information—

ISD-T360SB

VoiceDSP™ Digital Speech Processor with

Master/Slave, Full-Duplex Speakerphone, Multiple Flash

and ARAM/DRAM Support

The VoiceDSP™ product family combines multi-

ple digital signal processing functions on a single

chip for cost-effective solutions in telephony, au-

tomotive and consumer applications.

The VoiceDSP processor offers necessary fea-

tures to modern telephony products, such as:

high-quality, speech record and playback, elec-

trical and acoustic echo cancellation for full-du-

plex hands-free speakerphone operation.

The ISD-T360SB VoiceDSP can be used in various

applications:

Digital telephony with add-on speech

processing: Digital Telephone Answering

Machines(DTADs); and full-duplex, hands-

free speakerphone operation for ISDN,

DECT, Digital Spread Spectrum, and

analog cordless applications; CT0/1 Base

stations.

An add-on chip for corded telephones

featuring DTAD functions and/or full-

duplex, hands-free speakerphone

operation.

Stand-alone digital answering machines

with full-duplex, hands-free speakerphone

operation.

Voice memo recording

Automotive applications employing full-

duplex speakerphone operations for

hands-free, in-car communications, and

for car status and information

announcements.

Based on ISD’s unique concept which combines

16-bit DSP (Digital Speech Processor) and 16-bit

RISC core technology, the ISD-T360SB is a high-

performing chip solution for various applications.

To facilitate incorporating the VoiceDSP proces-

sor, it features system support functions such as

an interrupt control unit, codec interface (mas-

ter, slave), Microwire interface to the system mi-

crocontroller, as well as a memory handler for

Flash and DRAM memory devices. Design of

high-end, price optimized systems are possible

with ISD’s VoiceDSP flexible system interfaces

(codec, microcontroller, and memory manage-

ment support).

The ISD-T360SB processor operates as a peripher-

al controlled by the system microcontroller via

an enhanced, serial Microwire interface. The sys-

tem microcontroller typically controls the analog

circuits, buttons and display, as well as activates

functions through commands. The VoiceDSP ex-

ecutes these commands and returns status infor-

mation to the Microcontroller.

The VoiceDSP software resides in the on-chip

ROM. It includes DSP-based algorithms, system

support functions, and a software interface to

hardware peripherals.

Preliminary Information

ISD-T360SB

Voice Solutions in Silicon

™

FEATURES AT A GLANCE

DTAD MANAG

MENT

Highest quality speech recording in PCM

format for music on hold or other OGM

(Out Going Message) recording and IVS

Selectable high-quality speech

compression rate of 5.3 Kbit/s, 9.9 Kbits or

16.8 Kbit/s, plus silence compression with

each rate

Up to 16 minutes recording on a 4-Mbit

Flash

High-quality music compression for music

on hold (16.8 Kbits)

Programmable message tag for message

categorization, e.g., Mailboxes, InComing

Messages (ICM), OutGoing Messages

(OGM)

Message management

Skip forward or backward during message

playback

Variable speed playback

Real-time clock: Day of Week, Hours,

Minutes

Multi-lingual speech synthesis using

International Vocabulary Support (IVS)

Vocabularies available in: English,

Japanese, Mandarin, German, French

and Spanish

Software Automatic Gain Control (AGC)

SPEAKERPHONE

Digital full-duplex speakerphone

Acoustic- and line-echo cancellation

Continuous on-the-fly monitoring of

external and internal conditions (acoustic

and line) provides high-quality, hands-free,

conversation in a changing environment

Minimum microcontroller control

intervention (Launch-and-forget)

Supports: On, Off, Mute, and Hold

functions

CALL AND DEVICE MANAGEMENT

Digital volume control

Least cost routing support (LCR)

Power-down mode

3V to 5V selectable power supply

4.096 MHz operation

DTMF generation and detection

Telephone line functions, including busy

and dial tone detection

Single tone generation

DTMF detection during message playback

PERIPHERAL CONTROL

Codec

µ-Law, A-Law, and 16-bit linear codec

input support

Selectable master/slave codec interface

Supports two in-coming lines in slave mode

without speakerphone for DTAD recording

Supports up to 16 user selectable speech

channels in slave mode

Supports long-frame and short-frame

codecs

Single/double bit clock rate for slave

mode

On-chip codec clock generation

Memory

Supports up to four 4-Mbit, four 8-Mbit, or

four 16-Mbit Flash devices from Toshiba or

Samsung

Supports up to four 16-Mbit ARAM/DRAM

memory devices from Toshiba, Samsung,

and Samsung-compatible

The number of messages that can be

stored is limited only by memory size

Direct access to message memory

ISD-T360SB

iii

ISD

Message storage contains all data in a

concatenated chain of memory blocks.

Memory mapping and product floor test

included

Supports external vocabularies, using Flash

memory or expansion ROM

Microwire

MICROWIRE slave interface to an external

microcontroller

Sophisticated command language to

optimize system code size

INTERNATIONAL VOCABULARY SUPPORT (IVS)

For manufacturing recorded voice prompt and

speech synthesis, the ISD International Vocabu-

lary Support delivers pre-recorded voice

prompts in the same high-quality of the user-re-

corded speech. For complete control over qual-

ity and memory management, the IVS features

adjustable speech compressions. In addition,

several pre-recorded voice prompt sets are

available in various languages for further conve-

nience.

Available Languages:

English

Japanese

Mandarin

German

French

Spanish

Develop a new vocabulary by ISD’s voice

prompt development tool, the ISD-IVS360. This

vocabulary development tool supports various

languages and including their unique grammar

structures. ISD-IVS360, PC-Windows95™-based

program, synthesizes recorded .wav files into the

ISD-T360SB’s various compression rates (including

PCM).

ISD’s VoiceDSP products store IVS vocabularies

on either Flash memory or expansion ROM mem-

ories, thus DTAD manufacturers can design a

product for multiple countries, featuring various

languages.

For more details about IVS, refer to the

IVS User’s

Guide

ISD-T360SB

Voice Solutions in Silicon

™

Figure 1-1: ISD-T360SB Block Diagram—Basic Configuration with Four 4Mb/8Mb/16Mb

NAND Flash Devices (Samsung/Toshiba)

ISD-T360SB

ISD

Figure 1-2: ISD-T360SB Block Diagram—Basic Configuration with Four 4Mb Serial Toshiba Flash Devices

ISD-T360SB

Voice Solutions in Silicon

™

Figure 1-3: ISD-T360SB Block Diagram—Basic Configuration with Four 16Mb ARAM/DRAM Devices

(Samsung) and IVS EPROM

1—HARDWARE

ISD-T360SB

1-1

ISD

Chapter 1ÑHARDWARE

1.1 PIN ASSIGNMENT

The following sections detail the pins of the ISD-

T360SB processor. Slashes separate the names of

signals that share the same pin.

1.1.1 PIN-SIGNAL ASSIGNMENT

Table 1-1 shows all the pins, and the signals that

use them in different configurations. It also shows

the type and direction of each signal.

Figure 1-1: 80-MQFP Package Connection Diagram

6465666768697071727374757677787980

3736353433323130292827262524232221

MWRDY

VSS

MWDOUT

VCC

MWCLK

VSS

CAS/MMCLK

VCC

PB7

PB6

PB5

PB4

PB3

VSS

PB2

VCC

PB1

PB0

PC7

PC6/EMCS/ENV0

PC5

PC4/A15

PC3/A14

Top View

80-MQFP

403938

RESET

MWDIN

CCLK

CDIN

CFS0

616263

A10

VCCHI

VCC

PC0/A11

VSS

VCCA

X2/CLKIN

TST

MWRQST

MWCS

PC2/A13

PC1/A12

DWE/MMDIN

RAS/MMDOUT

ISD-T360SB

VSSA

CDOUT

CFS1

1—HARDWARE

ISD-T360SB

1-2

Voice Solutions in Silicon

™

TTL1 output signals provide CMOS levels in the

steady state, for small loads.

Input during reset. CMOS level input.

Virtual address lines for IVS ROM.

Chip select lines for Serial Flash devices.

Schmitt trigger input.

Table 1-1: VoiceDSP Pin Signal Assignment

Pin Name Signal Name Type Description

A(0:15) A(0:16) Output Address bits 0 through 16

CAS CAS Output DRAM Column Address Strobe

CCLK CCLK I/O Codec Master/slave Clock

CDIN CDIN Input Data Input from Codec

CDOUT CDOUT Output Data Output to Codec

CFS0 CFS0 I/O Codec 0 Frame Synchronization

CFS1 CFS1 Output Codec 1 Frame Synchronization

D(0:7) D(0:7) I/O Data bits 0 through 7

DWE DWE Output DRAM Write Enable

EMCS/ENV0 EMCS Output Expansion Memory Chip Select

EMCS/ENV0 ENV0 Input Environment Select

MMCLK MMCLK Output Master MICROWIRE Clock

MMDIN MMDIN Input Master MICROWIRE Data Input

MMDOUT MMDOUT Output Master MICROWIRE DATA Output

MWCLK MWCLK Input MICROWIRE Clock

MWCS MWCS Input MICROWIRE Chip Select

MWDIN MWDIN Input MICROWIRE Data Input

MWDOUT MWDOUT Output MICROWIRE DATA Output

MWRDY MWRDY Output MICROWIRE Ready

MWRQST MWRQST Output MICROWIRE Request Signal

PB(0:7)3PB(0:7) I/O Port B, bits 0 through 7

PC(0:7) PB(0:7) I/O Port C, bits 0 through 7

RAS RAS Output DRAM Row Address Strobe

RESET RESET Input Reset

TST TST Input Test pin

VCC VCC Power 3.3 V power supply pin

VCCAV

CCA Power 3.3 V analog circuitry power supply pin

VCCHI VCCHI Power 5 V power supply pin. Connect to VCC if 3.3 V power supply is

used.

VSS VSS Power Ground for on-chip logic and output drivers

VSSAV

SSA Power Ground for on-chip analog circuitry

X1 X1 Oscillator Crystal Oscillator Interface

X2/CLKIN X2 Oscillator Crystal Oscillator Interface

1—HARDWARE ISD-T360SB

1-3

ISD

1.2 DESCRIPTION

This section provides details of the functional

characteristics of the VoiceDSP processor. It is di-

vided into the following sections:

• Resetting

• Clocking

• Power-Down Mode

• Power and Grounding

• Memory Interface

• Codec Interface

1.2.1 RESETTING

The RESET pin is used to reset the VoiceDSP pro-

cessor.

On application of power, RESET must be held low

for at least tpwr after VCC is stable. This ensures

that all on-chip voltages are completely stable

before operation. Whenever RESET is applied, it

must also remain active for not less than tRST, see

Table 1-10 and Table 1-11. During this period,

and for 100 ms after, the TST signal must be high.

This can be done with a pull-up resistor on the TST

pin.

The value of MWRDY is undefined during the re-

set period, and for 100 ms after. The microcon-

troller should either wait before polling the signal

for the first time, or the signal should be pulled

high during this period.

Upon reset, the ENV0 signal is sampled to deter-

mine the operating environment. During reset,

the EMCS/ENV0 pin is used for the ENV0 input sig-

nals. An internal pull-up resistor sets ENV0 to 1.

After reset, the same pin is used for EMCS.

System Load on ENV0

For any load on the ENV0 pin, the voltage should

not drop below VENVh (see Table 1-10 and

Table 1-11).

If the load on the ENV0 pin causes the current to

exceed 10 µA, use an external pull-up resistor to

keep the pin at 1.

Figure 1-2 shows a recommended circuit for

generating a reset signal when the power is

turned on.

Figure 1-2: Recommended Power-On Reset

Circuit

1.2.2 CLOCKING

The VoiceDSP processor provides an internal os-

cillator that interacts with an external clock

source through the X1 and X2/CLKIN pins. Either

an external single-phase clock signal, or a crystal

oscillator, may be used as the clock source.

External Single-Phase Clock Signal

If an external single-phase clock source is used, it

should be connected to the CLKIN signal as

shown in Figure 1-3, and should conform to the

voltage-level requirements for CLKIN stated in

“ELECTRICAL CHARACTERISTICS” on page 1-18.

VCC

RESET

ISD-T360

VCC

VSS

1—HARDWARE

ISD-T360SB

1-4

Voice Solutions in Silicon

™

Figure 1-3: External Clock Source

Crystal Oscillator

A crystal oscillator is connected to the on-chip

oscillator circuit via the X1 and X2 signals, as

shown in Figure 1-4.

Figure 1-4: Connections for an External

Crystal Oscillator

Keep stray capacitance and inductance, in the

oscillator circuit, as low as possible. The crystal

resonator, and the external components, should

be as close to the X1 and X2/CLKIN pins as possi-

ble, to keep the trace lengths in the printed cir-

cuit to an absolute minimum.

You can use crystal oscillators with maximum

load capacitance of 20 pF, although the oscilla-

tion frequency may differ from the crystal’s spec-

ified value.

Table 1-2 lists the components in the crystal oscil-

lator circuit

1.2.3 POWER-DOWN MODE

Power-down mode is useful during a power fail-

ure or in a power-saving model, when the power

source for the processor is a backup battery or in

battery-powered devices, while the processor is

in idle mode.

In power-down mode, the clock frequency of

the VoiceDSP processor is reduced and some of

the processor modules are deactivated. As a re-

sult, the ISD-T360SB consumes considerably less

power than in normal-power mode. Although

the VoiceDSP processor does not perform all its

usual functions in power-down mode, it does re-

tain stored messages and maintain the date and

time.

NOTE In power-down mode all the chip select

signals, CS0 to CS3, are set to 1. To guaran-

tee that there is no current flow from these

signals to the Flash devices, the power sup-

ply to these devices must not be

disconnected.

The ISD-T360SB stores messages and all memory

management information in Flash or ARAM/

DRAM memory. When Flash memory is used for

memory management, power does not need to

be maintained to the processor to preserve

stored messages. When ARAM/DRAM memory is

used for message management, preserving

stored messages requires a battery back up dur-

X2/CLKIN

Clock Generator

VoiceDSP

Single-phase Clock Signal

X1X2

ISD-T360

Table 1-2: Components of Crystal Oscillator

Circuit

Component Values Tolerance

Crystal Resonator 4.096 MHz

Resistor R1 10 MΩ5%

Capacitors C1,

33 pF 20%

1—HARDWARE ISD-T360SB

1-5

ISD

ing a power failure. If the power failure extends

the life of the battery, the microcontroller should

perform the initialization sequence (as described

on page 2-4), and use the SETD command to set

the date and time.

To keep power consumption low during power-

down mode, the RESET, MWCS, MWCLK and

MWDIN signals should be held above VCC – 0.5 V

or below VSS + 0.5 V.

1.2.4 POWER AND GROUNDING

Power Pin Connections

The ISD-T360 can operate over two supply volt-

age ranges 3.3 V ±10% and 5 V ±10%. The five

power supply pins (VCC, VSS, VCCA, VSSA and

VCCHI) must be connected as shown in

Figure 1-5 when operating in a 3.3 V environ-

ment, and as shown in Figure 1-6 when operat-

ing in a 5 V environment. Failure to correctly

connect the pins may result in damage to the

device.

The Capacitor and Resistor values are given in

Table 1-3.

All capacitors represent two parallel capacitors at

the values 1.0 µF and 0.1 µF.

Figure 1-5: 3.3 V Power Connection Diagram

Table 1-3: Components of Supply Circuit

Component Values Tolerance

Resistor R1, R2 10 Ω5%

Capacitors(1) C1, C2

Capacitors C3, C4,

C5, C6, C7

1.0 µF

Tantalum

0.1 µF Ceramic

20%

74 72 64 63 61

30 32

VSSA

VSS

VCC

VCCHI

VSS

VCC

VCC VSS

3.3 V Supply

ISD-T360

VSS VCCAV

VCC

1—HARDWARE

ISD-T360SB

1-6

Voice Solutions in Silicon

™

Figure 1-6: 5 V Power Connection Diagram

For optimal noise immunity, the power and

ground pins should be connected to VCC and

the ground planes, respectively, on the printed

circuit board. If VCC and the ground planes are

not used, single conductors should be run direct-

ly from each VCC pin to a power point, and from

each GND pin to a ground point. Avoid daisy-

chained connections. The VoiceDSP does not

perform its usual functions in power-down mode

but it still preserves stored messages, maintains

the time of day and generates ARAM/DRAM re-

fresh cycles.

When you build a prototype, using wire-wrap or

other methods, solder the capacitors directly to

the power pins of the VoiceDSP processor sock-

et, or as close as possible, with very short leads.

1.2.5 MEMORY INTERFACE

Flash Support

The ISD-T360SB VoiceDSP supports Flash devices

for storing recorded data, thus, power can be

disconnected to the ISD-T360SB without losing

data. The ISD-T360SB supports serial and semi-

parallel Flash device interfaces, such as

TC58V16BFT, TC5816BFT, TC58A040F, KM29N040T,

KM2928000T/IT, and KM29216000AT/AIT. The ISD-

T360SB may be connected to up to four Flash de-

vices, resulting with maximum recording storage

of 16-Mbits x 4 = 64 Mbits (up to 4 hours of record-

ing time).

The following flash devices are supported:

74 72 64 63 61

30 32

VSSA

VSS

VCC

VCCHI

VSS

VCC

VCC VSS

5 V Supply

ISD-T360

VSS VCC VCCA

VSS

1—HARDWARE ISD-T360SB

1-7

ISD

Internal Memory Organization

The Flash devices detailed in Table 1-4 divide in-

ternally into basic 4-Kbyte block units. The ISD-

T360SB uses one block on each device for mem-

ory management, leaving the rest of the blocks

available for recording. Using at least one block

for a single recorded message yields a maximum

of NUM_OF_BLOCKS_IN_MEM – 1 (see Table 2-10

for parameter definition) messages per device.

Upon initialization the ISD-T360SB activates a sift-

ing algorithm to detect defected blocks. De-

fected blocks are defined as blocks with over 10

bad nibbles (a nibble consists of 4 bits). The de-

fected blocks are marked as UNUSED and ex-

cluded from the list of available blocks for

recording.

Toshiba Serial Flash

The VoiceDSP processor supports up to four

TC58A040F, 4Mbit, serial interface, Flash memory

devices for storing messages. The TC58A040F is

organized as an array of 128 blocks, with a ded-

icated, read-only, bad block map programmed

by the manufacturer and located in the last

block. This map is used by the ISD-T360SB to de-

fine the available blocks for recording. The ISD-

T360SB uses the VoiceDSP master MICROWIRE in-

terface to communicate, serially, with the Flash

devices, while selecting the current Flash device

using PB3-PB6. Connecting less than four Flash

devices require connecting the Flash devices se-

quentially, starting from PB3 up to PB6 (see

Figure 1-7). Refer to Figure 1-34for the Master MI-

CROWIRE timing diagram.

Table 1-4: Supported Flash Devices

Manufacturer Memory Device

Name Characteristics Operating

Voltage Memory Size Conversion T ype

Toshiba TC58V16BFT 2Mx8 3.3 V 16-Mbit LV µ-Law

Toshiba TC5816BFT 2Mx8 5 V 16-Mbit A-Law

Toshiba TC58A040F Serial 5V 4-Mbit µ-Law, A-Law

Samsung KM29N040T 512Kx8 5 V 4-Mbit µ-Law, A-Law,

Samsung KM29W8000T/IT 1Mx8 5 V 8-Mbit µLaw

Samsung KM29W16000AT

/AIT

2Mx8 5 V 16-Mbit A-Law

1—HARDWARE

ISD-T360SB

1-8

Voice Solutions in Silicon

™

Figure 1-7: Memory Interface with Four Toshiba 4Mbit Serial Flash Devices and

Optional Voice IVS EPROM

1—HARDWARE ISD-T360SB

1-9

ISD

Figure 1-8: Memory Interface with Four 4MB/16 Mbit, NAND Flash Devices (Samsung, Toshiba)

NAND Flash (Samsung, Toshiba)

The VoiceDSP processor supports up to four,

semi-parallel interface, Flash memory devices for

storing messages. Flash device with semi-parallel

interface uses a single 8bit I/O port to set the ad-

dress and access the data. The ISD-T360SB sup-

ports three types of Flash volumes (4Mbit, 8Mbit

and 16Mbit as listed in Table 1-4) while all the

connected Flash devices must be of the same

type. Ports B and C are used to connect ISD-

T360SB to the Flash devices using port B for ad-

dress and data transfer and port C for communi-

cation control and chip select. Connecting less

than four Flash devices require connecting the

Flash devices sequentially, starting from PC4 up

to PC7 (see Figure 1-8). The ISD-T360SB scans the

Flash devices upon initialization, sifting out the

bad blocks, and marking them in a special map,

located in the last block of each device.

1—HARDWARE

ISD-T360SB

1-10

Voice Solutions in Silicon

™

Figure 1-9: Memory Interface with Four Toshiba 4Mbit Serial Flash Devices and

Optional IVS EPROM

Flash Endurance

A Flash memory may be erased a limited num-

ber of times. To maximize the Flash use, the mem-

ory manager utilizes the Flash’s blocks evenly

(i.e., each block is erased more or less the same

number of times), to ensure that all blocks have

the same lifetime. Refer to the respective Flash

memory device data sheets for specific endur-

ance specifications.

A VoiceDSP processor message uses at least one

block.

The maximum recording time depends on four

factors:

1. The basic compression rate (5.3 Kbit/s,

9.9Kbit/s, or 16.8Kbit/s).

2. The amount of silence in the recorded

speech.

3. The number of bad blocks.

1—HARDWARE ISD-T360SB

1-11

ISD

The number of recorded messages. (The basic

memory allocation unit for a message is a 4-

Kbyte block, which means that half a block on

average is wasted per recorded message).

ARAM/DRAM Support

The VoiceDSP processor supports up to four,

16-Mbit, ARAM/DRAM devices for storing mes-

sages. The ISD-T360 connects to the ARAM/

DRAM device using address buses A0–A11 and

data buses D0–D3. This connection allows ac-

cess to 222 nibbles (16-Mbit) on each device. The

ISD-T360SB selects the current ARAM/DRAM de-

vice using PB3–PB6 as described in Figure 1-10.

Using less than four ARAM/DRAM devices re-

quires connecting the devices sequentially,

starting from PB3 up to PC6. RAS and CAS are

connected in parallel to all the ARAM/DRAM de-

vices and are used to refresh the memory. The

difference between ARAM and DRAM resides

with the amount of bad cells on the device and

the device performance. While DRAM has no

bad cells, ARAM contains certain level of impuri-

ty and thus requires testing and mapping of the

bad blocks upon the initialization of the ISD-

T360SB. Although there are no real blocks on the

ARAM device, the ISD-T360SB emulates virtual

“blocks” on the ARAM device (as if it was a Flash

device), tests these “blocks” and marks them in

a special map on the last “block” on each de-

vice. This test is required only when using ARAM

devices (as opposed to DRAM devices that re-

quire no testing due to lack of bad blocks). The

virtual division to blocks simplifies the use of

ARAM/DRAM devices and allows the use of the

same set of commands for Flash and ARAM/

DRAM.

Another major difference between ARAM/

DRAM and Flash devices is that the internal map-

ping in the ARAM is lost upon power off. Thus, the

initialization process needs to take place after

each power reset. The mapping is not lost when

entering and exiting the Power-Down Mode.

Refer to Figure 1-24 through Figure 1-28 for Timing

Diagrams of ARAM/DRAM Read, Write, Refresh in

Normal Mode and Refresh in Power-Down Mode

Cycles.

ROM Interface

IVS vocabularies can be stored in either Flash

memory and/or ROM. The VoiceDSP processor

supports IVS ROM devices through an Expansion

Memory mechanism. Up to 64 Kbytes (64K x 8) of

Expansion Memory are directly supported. Nev-

ertheless, the processor uses bits of the on-chip

port (PB) to further extend the 64 Kbytes address

space up to 0.5 Mbytes address space.

ROM is connected to the VoiceDSP processor us-

ing the data bus, D(0:7), the address bus,

A(0:15), the extended address signals, EA(16:18),

and Expansion Memory Chip Select, EMCS, con-

trols. The number of extended address pins to

use may vary, depending on the size and config-

uration of the ROM. ISD-T360SB configured with

semi-parallel Flash memory can not support ex-

tension ROM.

Table 1-5: Recording Time with 15% Silence

Compression

Memory Size Compression

Rate Total Recording

Time

4 Mbit 5.3 Kbit/s 14.9 Minutes

4 Mbit 9.9 Kbit/s 8.1 Minutes

4 Mbit 16.8 Kbit/s 4.8 Minutes

8 Mbit 5.3 Kbit/s 29.8 Minutes

8 Mbit 9.9 Kbit/s 16.2 Minutes

8 Mbit 16.8 Kbit/s 9.6 Minutes

16 Mbit 5.3 Kbit/s 59.6 Minutes

16 Mbit 9.9 Kbit/s 32.4 Minutes

16 Mbit 16.8 Kbit/s 19.2 Minutes

32 Mbit 5.3 Kbit/s 119.2 Minutes

32 Mbit 9.9 Kbit/s 64.8 Minutes

32 Mbit 16.8 Kbit/s 38.4 Minutes

1—HARDWARE

ISD-T360SB

1-12

Voice Solutions in Silicon

™

Figure 1-10: Memory Interface with Four 16-Mbit ARAM/DRAM Devices (Samsung, Toshiba) and

Optional IVS EPROM

Table 1-6: Supported DRAM Devices

Manufacturer Memory Device

Name Characteristics Operating V oltage Memory Size

Samsung KM44C4004CS-6 EDO 4Mx4 5 V 16-Mbit EDO LV

Samsung KM44V4004CS-6 EDO 4Mx4 3.3 V 16-Mbit EDO

Toshiba TP EDO 4Mx4 5V, 3.3V 16-Mbit EDO, LV

1—HARDWARE ISD-T360SB

1-13

ISD

1.2.6 THE CODEC INTERFACE

The ISD-T360 provides an on chip interface for

analog and digital telephony, supporting master

and slave codec interface modes. In master

mode, the ISD-T360 controls the operation of the

codec for use in analog telephony. In the slave

mode, the ISD-T360 codec interface is controlled

by an external source. This mode is used in digital

telephony (i.e., ISDN or DECT lines). The slave

mode is implemented with respect to IOM-2™/

CGI specifications.

See Table 1-7 for codec options for the ISD-

T360SB (ISD supports compatible codecs in addi-

tion to those listed below).

The codec interface supports the following fea-

tures:

• Master Mode or Slave Mode.

• 8- or 16-bit Channel Width.

• Long (Variable) or Short (Fixed) Frame

Protocol.

• Single or Double Bit (Slave Mode Only)

Clock Rate.

• Single or Dual Channel Codecs

• One or Two Codecs

• Multiple Clock And Sample Rates.

• One or Two Frame Sync Signals

This codec interface uses five signals: CDIN, CD-

OUT, CCLK, CFS0, and CFS1. The CDIN, CDOUT,

CCLK, and CFS0 pins are connected to the first

codec. The second codec is connected to

CDIN, CDOUT, CCLK, and CFS1 pins. Data is

transferred to the codec through the CDOUT

output pin. Data is read from the codec through

the CDIN input pin. The CCLK and CFS0 pins are

output in Master Mode and input in Slave Mode.

The CFS1 is an output pin.

Short Frame Protocol

When the short frame protocol is configured,

eight or sixteen data bits are exchanged with

each codec in each frame (i.e., the CFS0 cycle).

Data transfer begins when CFS0 is set to 1 for one

CCLK cycle. The data is then transmitted, bit by

bit, via the CDOUT pin. Concurrently, the re-

ceived data is shifted in through the CDIN pin.

Data is shifted one bit per CCLK cycle. After the

last bit has been shifted, CFS1 is set to 1 for one

CCLK cycle. Then, the data from the second co-

dec is shifted out via CDOUT, concurrently with

the inward shift of the data received via CDIN.

Long Frame Protocol

When long frame protocol is configured, eight or

sixteen data bits are exchanged with each co-

dec, as for the short frame protocol. However,

for the long frame protocol, data transfer starts

by setting CFS0 to 1 for eight or sixteen CCLK cy-

cles. Short or long frame protocol is available in

both Master and Slave modes. Figure 1-11 illus-

trates an example of short frame protocol with

an 8-bit channel width.

Table 1-7: Supported Codec Devices

Manufacturer Codec Device Name Characteristics Operating V oltage Conversion T ype

National

Semiconductor

TP3054 Single codec 5 V µ-Law

National

Semiconductor

TP 3057 Single codec 5 V A-Law

Oki MSM7533V Dual codec 5 V µ-Law, A-Law

Oki MSM 7704 Dual codec 3.3 V µ-Law, A-Law, LV

Macronix MX93002FC Dual codec 5 V µ-Law

Lucent T7502 Dual codec 5 V A-Law

Lucent T7503 Dual codec 5 V µ-Law

1—HARDWARE

ISD-T360SB

1-14

Voice Solutions in Silicon

™

Figure 1-11: Codec Protocol-Short Frame—8-Bit Channel Width

Channel Width

The Codec interface supports both 8-bit and 16-

bit channel width in Master and Slave Modes.

Slave Mode

The VoiceDSP supports digital telephony appli-

cations including DECT and ISDN by providing a

Slave Mode of operation. In Slave Mode opera-

tion, the CCLK signal is input to the ISD-T360 and

controls the frequency of the codec interface

operation. The CCLK may take on any frequen-

cy between 500 KHz and 4 MHz. Both long and

short frame protocol are supported with only the

CFS1 output signal width affected. The CFS0 in-

put signal must be a minimum of one CCLK cy-

cle.

In slave mode, a double clock bit rate feature is

available as well. When the codec interface is

configured to double clock bit rate, the CCLK in-

put signal is divided internally by two and the re-

sulting clock used to control the frequency of the

codec of the codec interface operation.

This interface supports ISDN protocol with one bit

clock rate or double bit clock rate. The exact for-

mat is selected with the CFG command. The

slave codec interface uses four signals: CDIN,

CDOUT, CCLK, and CFS0. The CDIN, CCLK, and

CFS0 input pins and the CDOUT output pins are

connected to the ISDN/DECT agent. Data is

transferred to the VoiceDSP through the CDIN

pin and read out through the CDOUT pin. The

CFS0 pin is used to define the start of each frame

(see below) the source of that signal is at the

master side. The CCLK is used for bit timing of

CDIN and CDOUT. The rate of the CCLK is config-

ured via the CFG command and can be twice

of the data rate or at the data rate. The source

of that signal is at the master side.

1—HARDWARE ISD-T360SB

1-15

ISD

Figure 1-12: Codec Interface with One Single Codec, NSC TP3054, for Single Line Operation

Table 1-8: Typical Codec Applications

Application Codec

Type No. of

Channels Master/

Slave

Channel

Width

(No. Bits)

Long/

Short

Frame

Protocol

Bit Rate CCLK

Freq.

(MHz)

Sample

Rate (Hz)

No. of

Frame

Syncs

Analog µ-

Law

single 1 Master 8 short or

long

1 2.048 8000 1

ISDN—8 bit

digital—A-

Law

dual 2 Slave 8 short 1 or 2 2.048 8000 1

Linear single 1 Master 16 short 1 2.048 8000 1

IOM-2/GCI single

or dual

1–2 Slave 8 short 1 or 2 1.536 8000 1

266

Compatibility

single

or dual

1 or 2 Master 8 long or

short

1 2.048 8000 1 or 2

1—HARDWARE

ISD-T360SB

1-16

Voice Solutions in Silicon

™

Figure 1-13: Codec Interface Diagram with Two, Single Codecs, NSC TP3054, and NSC TP3057, for

Speakerphone Operation

Figure 1-14: Codec Interface for Dual Line or Single Line and Speakerphone Operation

with OKI Dual Codec

1—HARDWARE ISD-T360SB

1-17

ISD

Figure 1-15: Codec Interface for Dual Line or Single Line and Speakerphone

with Lucent Dual Codec

Figure 1-16: Codec Interface for Dual Line or Single Line and Speakerphone Operation

with Macronix Dual Codec

1—HARDWARE

ISD-T360SB

1-18

Voice Solutions in Silicon

™

1.3 SPECIFICATIONS

1.3.1 ABSOLUTE MAXIMUM RATINGS

NOTE Absolute maximum ratings indicate limits

beyond which permanent damage may

occur. Continuous operation at these limits

is not intended; operation should be limited

to the conditions specified below.

1.3.2 ELECTRICAL CHARACTERISTICS

TA = 0ºC to +70ºC, VCC = 5 V ±10% Or 3.3 V ±10%, GND = 0 V

Storage temperature –65˚C to +150˚C

Temperature under bias 0˚C to +70˚C

All input and output

voltages with respect to

GND

–0.5 V to +6.5 V

Table 1-9: Electrical Characteristics—Preliminary Information

(All Parameters with Reference to VCC = 3.3 V)

Symbol Parameter Conditions Min Typ Max Units

CXX1 and X2 Capacitance117.0 pF

ICC1 Active Supply Current Normal Operation Mode,

Running Speech Applications240.0 80.0 mA

ICC2 Standby supply current Normal Operation Mode, DSPM

Idle230.0 mA

ICC3 Power-down Mode Supply

Current

Power-down Mode2,3 0.7 mA

ILInput Load Current 0 V ≤ VIN ≤ VCC –5.0 5.0 µA

IO (Off) Output Leakage Current

(I/O pins in Input Mode)

0 V ≤ VOUT ≤ VCC –5.0 5.0 µA

tCASa CAS Active After R.E. CTTL, T1 or T2W3 12.0

tCASh CAS Hold After R.E. CTTL 0.0

tCASia CAS Inactive After R.E. CTTL, T3 or TERF 12.0

tCASLw DRAM, PDM, CAS Width At 0.8 V, Both Edges 600.0

tDWEa DWE Active After R.E. CTTL, T2W2 12.0

tDWEh DWE Hold After R.E. CTTL 12.0

tDWEia DWE Inactive After R.E. CTTL, T3 12.0

tRASa RAS Active After R.E. CTTL, T2W1 or T2WRF 12.0

tRASh RAS Hold After R.E. CTTL 0.0

tRASia RAS Inactive After R.E. CTTL, T3 or T3RF 12.0

tRASLw DRAM PDM, RAS Width At 0.8 V, Both Edges 200.0

tRLCL DRAM PDM RAS Low, after

CAS Low

F.E. CAS to F.E. RAS 200.0

tWRa WR0 Active After R.E. CTTL, T1 tCTp/2+2

1—HARDWARE ISD-T360SB

1-19

ISD

Guaranteed by design.

OUT

=0, T

25˚C, V

= 3.3 V for V

pins and 3.3 V or 5 V on V

CCHI

pins, operating from a 4.096 MHz crystal and

running from internal memory with Expansion Memory disabled.

All input signals are tied to 0 (above V

– 0.5 V or below V

+ 0.5 V), except ENV0, which is tied to V

Measured in power-down mode. The total current driven, or sourced, by all the VoiceDSP processor’s output signals

is less than 50 µA.

Guaranteed by design, but not fully tested.

tWRCSh WR0 Hold after EMCS4R.E. EMCS R.E. to R.E. WR0 10.0

tWRh WR0 Hold After R.E. CTTL tCTp/2–6

tWRia WR0 Inactive After R.E. CTTL, T3 tCTp/2+2

VENVh ENV0 Input, High Voltage 2.0 V

VHh CMOS Input with Hysteresis,

Logical 1 Input Voltage

2.1 V

VHl CMOS Input with Hysteresis,

Logical 0 Input Voltage

0.8 V

VHys Hysteresis Loop Width10.5 V

VIH TTL Input, Logical 1 Input

Voltage

2.0 VCC+0.5 V

VIL TTL Input, Logical 0 Input

Voltage

–0.5 0.8 V

VOH Logical 1 TTL, Output

Voltage

IOH = –0.4 mA 2.4 V

VOHWC MMCLK, MMDOUT and

EMCS Logical 1, Output

Voltage

IOH = –0.4 mA 2.4 V

IOH = –50 µA5VCC–0.2 V

VOL Logical 0, TTL Output

Voltage

IOL = 4 mA 0.45 V

IOL = 50 µA50.2 V

VOLWC MMCLK, MMDOUT and

EMCS Logical 0, Output

Voltage

IOL = 4 mA 0.45 V

IOL = 50 µA50.2 V

VXH CLKIN Input, High Voltage External Clock 2.0 V

VXL CLKIN Input, Low Voltage External Clock 0.8 V

Table 1-9: Electrical Characteristics—Preliminary Information

(All Parameters with Reference to VCC = 3.3 V)

Symbol Parameter Conditions Min Typ Max Units

1—HARDWARE

ISD-T360SB

1-20

Voice Solutions in Silicon

™

1.3.3 SWITCHING CHARACTERISTICS—PRELIMINARY

Deﬁnitions

All timing specifications in this section refer to

0.8 V or 2.0 V on the rising or falling edges of the

signals, as illustrated in Figure 1-17 through

Figure 1-23, unless specifically stated otherwise.

Maximum times assume capacitive loading of

50pF. CLKIN crystal frequency is 4.096 MHz.

NOTE CTTL is an internal signal and is used as a ref-

erence to explain the timing of other

signals. See Figure 1-37.

Figure 1-17: Synchronous Output Signals (Valid, Active and Inactive)

NOTE:

Signal valid, active or inactive time, after a rising edge of CTTL or MWCLK.

Figure 1-18: Synchronous Output Signals (Valid)

NOTE:

Signal valid time, after a falling edge of MWCLK.

2.0V

0.8V

CTTL or

MWCLK

Signal

tSignal

2.0V

0.8V

MWCLK

Signal

tSignal

0.8V

1—HARDWARE ISD-T360SB

1-21

ISD

Figure 1-19: Synchronous Output Signals (Hold), after Rising Edge of CTTL

NOTE:

Signal hold time, after a rising edge of CTTL.

Figure 1-20: Synchronous Output Signals (Hold), after Falling Edge of MWCLK

NOTE:

Signal hold time, after a falling edge of MWCLK.

Figure 1-21: Synchronous Input Signals

NOTE:

Signal setup time, before a rising edge of CTTL or MWCK, and signal hold time after a rising edge of CTTL or MWCK

2.0V

0.8V

CTTL

Signal

2.0V

tSignal

2.0V

0.8V

MWCLK

Signal

tSignal

2.0V

2.0 V

CTTL or

MWCLK

2.0 V

0.8 V

2.0 V

0.8 V

tSignal Setup tSignal Hold

Signal

1—HARDWARE

ISD-T360SB

1-22

Voice Solutions in Silicon

™

Figure 1-22: Asynchronous Signals

NOTE:

Signal B starts after rising or falling edge of signal A.

The RESET has a Schmitt trigger input buffer. Figure 1-23 shows the input buffer characteristics.

Figure 1-23: Hysteresis Input Characteristics

2.0 V

0.8 V

2.0 V

0.8 V

Signal A

Signal B

tSignal

Vout

VHh

VHl

VHys

1—HARDWARE ISD-T360SB

1-23

ISD

1.3.4 SYNCHRONOUS TIMING TABLES

In this section, R.E. means Rising Edge and F.E. means Falling Edge.

In normal operation mode, t

CTp

must be 48.8 ns; in power-down mode, t

CTp

must be 50,000 ns.

Guaranteed by design, but not fully tested.

Table 1-10: Output Signals—Preliminary

Symbol Figure Description Reference Conditions Min (ns) Max (ns)

tAh Address Hold After R.E. CTTL 0.0

tAv Address Valid After R.E. CTTL, T1 12.0

tCCLKa CCLK Active After R.E. CTTL 12.0

tCCLKh CCLK Hold After R.E. CTTL 0.0

tCCLKia CCLK Inactive After R.E. CTTL 12.0

tCDOh CDOUT Hold After R.E. CTTL 0.0

tCDOv CDOUT Valid After R.E. CTTL 12.0

tCTp CTTL Clock Period1R.E. CTTL to next R.E.

CTTL

30.5 250,000

tEMCSa EMCS Active After R.E. CTTL, T2W1 12.0

tEMCSh EMCS Hold After R.E. CTTL 0.0

tEMCSia EMCS Inactive After R.E. CTTL T3 12.0

tFSa CFS0 Active After R.E. CTTL 25.0

tFSh CFS0 Hold After R.E. CTTL 0.0

tFSia CFS0 Inactive After R.E. CTTL 25.0

tMMCLKa Master MICROWIRE Clock Active After R.E. CTTL 12.0

tMMCLKh Master MICROWIRE Clock Hold After R.E. CTTL 0.0

tMMCLKia Master MICROWIRE Clock

Inactive

After R.E. CTTL 12.0

tMMDOh Master MICROWIRE Data Out

Hold

After R.E. CTTL 0.0

tMMDOv Master MICROWIRE Data Out

Valid

After R.E. CTTL 12.0

tMWDOf MICROWIRE Data Float1After R.E. MWCS 70.0

tMWDOh MICROWIRE Data Out Hold2After F.E. MWCLK 0.0

tMWDOnf MICROWIRE Data No Float2After F.E. MWCS 0.0 70.0

tMWDOv MICROWIRE Data Out Valid2After F.E. MWCLK 70.0

tMWITOp MWDIN to MWDOUT Propagation Time 70.0

tMWRDYa MWRDY Active After R.E. of CTTL 0.0 35.0

tMWRDYia MWRDY Inactive After F.E. MWCLK 0.0 70.0

tPABCh PB and MWRQST After R.E. CTTL 0.0

tPABCv PB and MWRQST After R.E. CTTL, T2W1 12.0

1—HARDWARE

ISD-T360SB

1-24

Voice Solutions in Silicon

™

Guaranteed by design, but not fully tested in power-down mode.

Guaranteed by design, but not fully tested.

Table 1-11: Input Signals—Preliminary

Symbol Figure Description Reference Conditions Min (ns) Max (ns)

tCCLKSp Codec Clock Period (slave) R.E. CCLK to next R.E. CCLK 244

tCCLKSh Codec Clock High (slave) At 2.0 V (both edges) 120

tCCLKSl Codec Clock Low (slave) At 0.8 V (both edges) 120

tCDIh CDIN Hold After R.E. CTTL 0.0

tCDIs CDIN Setup Before R.E. CTTL 11.0

tCFS0Ss CFS0 Setup Before R.E. CCLK TBD

tCFS0Sh CFS0 Hold After R.E. CCLK TBD

tDIh Data in Hold (D0:7) After R.E. CTTL T1, T3 or TI 0.0

tDIs Data in Setup (D0:7) Before R.E. CTTL T1, T3 or TI 15.0

tMMDINh Master MICROWIRE Data In

Hold

After R.E. CTTL 0.0

tMMDINs Master MICROWIRE Data In

Setup

Before R.E. CTTL 11.0

tMWCKh MICROWIRE Clock High

(slave)

At 2.0 V (both edges) 100.0

tMWCKl MICROWIRE Clock Low

(slave)

At 0.8 V (both edges) 100.0

tMWCKp MICROWIRE Clock Period

(slave)1R.E. MWCLK to next R.E.

MWCLK

2.5 µs

tMWCLKh MWCLK Hold After MWCS becomes

inactive

50.0

tMWCLKs MWCLK Setup Before MWCS becomes

active

100.0

tMWCSh MWCS Hold After F.E. MWCLK 50.0

tMWCSs MWCS Setup Before R.E. MWCLK 100.0

tMWDIh MWDIN Hold After R.E. MWCLK 50.0

tMWDIs MWDIN Setup Before R.E. MWCLK 100.0

tPWR Power Stable to RESET R.E.2After VCC reaches 4.5 V 30.0 ms

tRSTw RESET Pulse Width At 0.8 V (both edges) 10.0 ms

tXh CLKIN High At 2.0 V (both edges) tX1p/2 – 5

tXl CLKIN Low At 0.8 V (both edges) tX1p/2 – 5

tXp CLKIN Clock Period R.E. CLKIN to next R.E. CLKIN 244.4

1—HARDWARE ISD-T360SB

1-25

ISD

1.3.5 TIMING DIAGRAMS

Figure 1-24: ROM Read Cycle Timing

This cycle may be either TI (Idle), T3 or T3H.

Data can be driven by an external device at T2W1, T2W, T2 and T3.

This cycle may be either TI (Idle) or T1.

Figure 1-25: ARAM/DRAM Refresh Cycle Timing (Normal Operation)

This cycle may be either TI (Idle) or T1 of any non-DRAM bus cycle. If the next bus cycle is a DRAM one, T3RF is

followed by three TI (Idle) cycles.

1—HARDWARE

ISD-T360SB

1-26

Voice Solutions in Silicon

™

Figure 1-26: ARAM/DRAM Power-Down Refresh Cycle Timing

Figure 1-27: DRAM Read Cycle Timing

A0-A10 in the IRE environment, when Expansion

Memory is disabled; otherwise A0-A15.

This cycle may be either TI (Idle) or T1 of any non-DRAM bus cycle. If the next bus cycle is to DRAM, T3 is followed by

three TI (Idle) cycles.

An external device can drive data from T2W3 to T3.

CTTL

RAS

CAS

A0-10

DWE

D0-1,

D3-7

D2/RA11

TI TIT1 T2W1 T2W1T2W2 6xT2W TI T1T2 T3 TI

Row Column

tRASa tRASia

tCASa tCASia

tAv

D2 In

tDf

tAv

tDIs tDIh

tDf

(Note 1)

(Note 3)

T2W2 T2W3

(Note 2)

Data In

RA11

tAh

tAv tAh

tRASh tRASh

tCASh tCASh

T2W3

RA11

A0-15

1—HARDWARE ISD-T360SB

1-27

ISD

Figure 1-28: DRAM Write Cycle Timing

A0–A10 in the IRE environment, when Expansion

Memory is disabled; otherwise A0–A15.

This cycle may be either TI (Idle) or T1 of any non-DRAM bus cycle. If the next bus cycle is to DRAM, T3 is followed by

three TI (idle) cycles.

CTTL

RAS

CAS

DWE

D0-1,

D3-7

D2/RA11

TI TIT1 T2W1 T2W2 6xT2W TIT2 T3

tRASa tRASia

tCASa tCASia

tDf

(Note 1)

(Note 2)

tDWEa

tDf

tDh

tDv

tDf

tDh

Row Column

D2 Out

Data Out

RA11

tAv

tAh

tRASh tRASh

tCASh

tDWEh

tDWEia

tDWEh

tAv

tAv tDv

T2W3

A0-10

A0-15

1—HARDWARE

ISD-T360SB

1-28

Voice Solutions in Silicon

™

Figure 1-29: Codec Short Frame Timing

NOTE:

The CCLK and CFS0 timing is shown for Master Mode only. For Slave Mode, see Figure 1-31.

Figure 1-30: Codec Long Frame Timing

NOTE:

The CCLK and CFS0 timing is shown for Master Mode only. For Slave Mode, see Figure 1-31.

CTTL

CCLK

CFS0/

CDOUT

CDIN

tCTp tCTp

tCTp tCTp tCTp

tCTp 4xtCTp tCTp tCTp

tCTp tCTp 4xtCTp

tCCLKa

tCCLKia

tFSa

tCTp tCTp

CFS1

tFSia

tCDIs tCDIh

BIT 7

tCDOv

tCDOh

tCCLKh tCCLKh

tFSh tFSh

tCTp

4xtCTp tCTp tCTp tCTp

tCTp

4xtCTp tCTp tCTp

tCDOv

CTTL

CCLK

CFS0/

CDOUT

CDIN

tCTp tCTp

tCTp tCTp tCTp

tCTp 4xtCTp tCTp tCTp

tCTp tCTp 4xtCTp

tCCLKa

tCCLKia

tFSa

tCTp

CFS1

tFSia

BIT 0

tCDOv

tCDOh

tCCLKh tCCLKh

tFSh tFSh

tCTp

4xtCTp tCTp tCTp

tCTp

BIT 7

1—HARDWARE ISD-T360SB

1-29

ISD

Figure 1-31: Slave Codec CCLK and CFS0 Timing

Figure 1-32: MICROWIRE Transaction Timing—Data Transmitted to Output

CCLK

CFS0

tCFS0Ss tCFS0Sh

tCCLKSh tCCLKSl

tCCLKSp

1—HARDWARE

ISD-T360SB

1-30

Voice Solutions in Silicon

™

Figure 1-33: MICROWIRE Transaction Timing—Data Echoed to Output

Figure 1-34: Master MICROWIRE Timing

1—HARDWARE ISD-T360SB

1-31

ISD

Figure 1-35: Output Signal Timing for Port PB and MWRQST

NOTE:

This cycle may be either TI (Idle), T2, T3 or T3H.

Figure 1-36: CLKIN Timing

Figure 1-37: CTTL Timing

1—HARDWARE

ISD-T360SB

1-32

Voice Solutions in Silicon

™

Figure 1-38: Reset Timing When Reset Is Not at Power-Up

Figure 1-39: Reset Timing When Reset Is at Power-Up

2—SOFTWARE ISD-T360SB

2-1

ISD

Chapter 2ÑSOFTWARE

The VoiceDSP software resides in the on-chip

ROM. It includes DSP-based algorithms, system

support functions and a software interface to

hardware peripherals.

2.1 SYSTEM OPERATION

This section provides details of the system sup-

port functions and their principle operation. It is

divided into the following subjects:

• The State Machine

• Command Execution

• Event Handling

• Message Handling

• Tone Generation

• Initialization and Configuration

• Power Down Mode (PDM)

2.1.1 THE STATE MACHINE

The ISD-T360SB operates in two modes, normal

mode (DTAD) and speakerphone mode. To

change the mode use the Set Speakerphone

Mode (SSM) command. The VoiceDSP processor

functions as a state machine under each mode.

It changes state either in response to a com-

mand sent by the microcontroller, after execu-

tion of the command is completed, or as a result

of an internal event (e.g. memory full or power

failure). For more information see “VoiceDSP

PROCESSOR COMMANDS—QUICK REFERENCE

TABLE” on page 2-21. The VoiceDSP states are

desctibed below:

RESET

The VoiceDSP processor is initialized to the RESET

state after a full hardware reset by the RESET sig-

nal (See “RESETTING” on page 1-3). In this state

the processor detectors (VOX, constant energy,

call progress tones and DTMF) are not active. In

all other states, these detectors are active. (See

the SDET and RDET commands for further de-

tails).

IDLE

This is the state from which most commands are

executed. As soon as a command and all its pa-

rameters are received, the processor starts exe-

cuting the command.

PLAY

In this state a message is decompressed (unless

stored in PCM format), and played back.

RECORD

In this state a message is compressed (unless

stored in PCM format) and recorded into the

message memory.

SYNTHESIS

An individual word or a sentence is synthesized

from an external vocabulary in this state.

TONE_GENERATE

In the TONE_GENERATE state, the VoiceDSP pro-

cessor generates single or DTMF tones.

MSG_OPEN

The VoiceDSP processor either reads or writes 32

bytes to the message memory, or sets the mes-

sage read/write pointer on a 32 byte boundary.

2—SOFTWARE

ISD-T360SB

2-2

Voice Solutions in Silicon

™

2.1.2 COMMAND EXECUTION

A VoiceDSP processor command is represented

by an 8-bit opcode. Some commands have pa-

rameters and some have return values. Com-

mands are either synchronous or asynchronous.

SYNCHRONOUS COMMANDS

A synchronous command must complete exe-

cution before the microcontroller can send a

new command (e.g. GMS, GEW). A command

sequence begins when the microcontroller

sends an 8-bit opcode to the processor, fol-

lowed by the command’s parameters (if any).

The VoiceDSP processor then executes the com-

mand and, if required, transmits a return value to

the microcontroller. Upon completion, the pro-

cessor notifies the microcontroller that it is ready

to accept a new command.

ASYNCHRONOUS COMMANDS

An asynchronous command starts execution in

the background and notifies the microcontroller,

which can send more commands while the cur-

rent command is still running (e.g. R, P). After re-

ceiving an asynchronous command, such as P

(Playback), R (Record), SW (Say Words) or GT

(Generate Tone), the VoiceDSP processor

switches to the appropriate state and executes

the command until finished or a S (Stop) or PA

(Pause) command is received from the micro-

controller. When completed, the EV_NORMAL

_END event is set and the processor switches to

the IDLE state.

“VoiceDSP PROCESSOR COMMANDS—QUICK

REFERENCE TABLE” on page 2–21 displays all the

processor commands, the valid source states in

which these commands are valid, and the states

resulting from the command.

2.1.3 EVENT HANDLING

STATUS WORD

The 16-bit status word indicates events that oc-

cur during normal operation. The VoiceDSP pro-

cessor activates the MWRQST signal, to indicate

a change in the status word. This signal remains

active until the processor receives a GSW (Get

Status Word) command.

For detailed description of the Status Word and

the meaning of each bit, see “GSW Get Status

Word” on page 2-33.

ERROR WORD

The 16-bit error word indicates errors that oc-

curred during execution of the last command. If

an error is detected, the command is not pro-

cessed; the EV_ERROR bit in the status word is set

to 1, and the MWRQST signal is activated.

ERROR HANDLING

When the microcontroller detects the active

MWRQST signal, it issues the GSW command, de-

activating the MWRQST signal. Then, the micro-

controller tests the EV_ERROR bit in the status

word, and, if set, sends the GEW (Get Error Word)

command to read the error word for details.

For detailed description of the Error Word and

the meaning of each bit, see “GEW Get Error

Word” on page 2-30.

2—SOFTWARE ISD-T360SB

2-3

ISD

2.1.4 MESSAGE HANDLING

A message is the basic unit on which most of the

VoiceDSP commands operate. A VoiceDSP pro-

cessor message, stored on a memory device

(Flash or ARAM/DRAM), can be regarded as a

computer file stored on a mass-storage device.

The ISD-T360SB manages messages for a wide

range of applications, which require different

levels of DTAD functionality. The VoiceDSP pro-

cessor features advanced memory-organization

features such as multiple OutGoing Messages

(OGMs), mailboxes, and the ability to distinguish

between InComing Messages (ICMs) and

OGMs.

A message is created with either the R (Record)

or the CMSG (Create Message) command.

Once created, the message is assigned a time-

and-day stamp and a message tag which is

read by the microcontroller. The R command

takes voice samples from the codec, compress-

es them, and stores them in the message mem-

ory.

When a message is created with the CMSG

command the data to be recorded is provided

by the microcontroller, via the WMSG (Write Mes-

sage) command and not through the codec.

Here, the data is transferred directly to the mes-

sage memory, and not compressed by the ISD-

T360SB voice compression algorithm.

WMSG, RMSG (Read Message) and SMSG (Set

Message Pointer) are message-data access

commands used to store and read data to or

from any location in the message memory (see

“VoiceDSP PROCESSOR COMMANDS—QUICK

REFERENCE TABLE” on page 2-21 for more de-

tails). Using these commands, the microcontrol-

ler utilizes messages for features such as a

Telephone Directory and playing back (P com-

mand) or deleting (DM command) a message.

Remove redundant data (e.g., trailing tones or

silence) from the message tail with the CMT (Cut

Message Tail) command.

The PA (Pause) and RES (Resume) commands

suspend the P and R commands, respectively,

and then resume them from where they were

suspended.

CURRENT MESSAGE

The GTM (Get Tagged Message) command se-

lects the current message. Most message han-

dling commands (P, DM, RMSG), operate on the

current message.

Deleting the prevailing message does not cause

a different message to become current; the cur-

rent message is undefined. If you issue the GTM

command to skip to the next message, the first

message, newer than the just deleted message,

becomes the current message.

MESSAGE TAG

Each message has a 2-byte message tag which

used to categorize messages, and implement

such features as OutGoing Messages, mailbox-

es, and different handling of old and new mes-

sages.

The tag is created during the R (Record) com-

mand. Use the GMT (Get Message Tag) and SMT

(Set Message Tag) commands to handle mes-

sage tags.

NOTE Message tag bits can only be cleared and

are set only when a message is first cre-

ated. This limitation, inherent in Flash

memories, allows bits to be changed only

from 1 to 0 (changing bits from 0 to 1

requires a special erasure procedure).

However, the usual reason for updating an

existing tag is to mark a message as old. This

can be done when a message is first cre-

ated by using one of the bits as a new/old

indicator, setting the bit to 1 and later

clearing it when necessary.

2—SOFTWARE

ISD-T360SB

2-4

Voice Solutions in Silicon

™

2.1.5 TONE GENERATION

The VoiceDSP processor generates DTMF tones

and single-frequency tones from 300Hz to 3000Hz

in increments of 100Hz. The ISD-T360SB tone gen-

eration conforms to the EIA-470-RS standard.

Note, however, that value of some tunable pa-

rameters may need adjusting to meet the stan-

dard specifications since the energy level of

generated tones depends on the analog circuits

used.

1. Tune the DTMF_GEN_TWIST_LEVEL param-

eter to control the twist level of the gener-

ated DTMF tones.

2. Use the VC (Volume Control) command,

and tune the TONE_GEN_LEVEL parame-

ter, to control the energy level at which

these tones are generated.

3. Use the GT (Generate Tone) command to

specify the DTMF tones, and the frequen-

cy at which single tones are generated.

Refer to table 2-5, VC command and GT com-

mand of the Command Description section for

furhter details of the relevant tunable parame-

ters and commands.

NOTE The DTMF detector performance is

degraded during tone generation, espe-

cially if the frequency of the generated

tone is close to the frequency of one of the

DTMF tones.

2.1.6 INITIALIZATION AND CONFIGURATION

Use the following procedures to initialize the

VoiceDSP processor:

NORMAL INITIALIZATION

Reset the VoiceDSP processor by activating the

RESET signal. (See “RESETTING” on page 1-3.)

1. Issue a CFG (Configure VoiceDSP proces-

sor) command to change the configura-

tion according to your environment.

2. Issue an INIT (Initialize System) command

to initialize the VoiceDSP firmware.

3. Issue a series of TUNE commands to adjust

the VoiceDSP processor to the require-

ments of your system.

TUNABLE PARAMETERS

The VoiceDSP processor can be adjusted to the

specific system’s requirements using a set of tun-

able parameters. These parameters are set to

their default values after reset and can be later

modified with the TUNE command. By tuning

these parameters, you can control various as-

pects of the VoiceDSP processor’s operation,

such as silence compression, tone detection,

and no-energy detection.

Tables 2-4 to 2-11 of the Command Description

section describe all the tunable parameters in

detail.

2—SOFTWARE ISD-T360SB

2-5

ISD

2.1.7 POWER-DOWN MODE

The PDM (Go To Power-Down Mode) command

switches the ISD-T360SB to power-down mode.

The purpose of the PDM command is to save

power during buttery operation, or for any other

power saving cause. During power-down mode

only basic functions, such as ARAM/DRAM re-

fresh and time and date update, are active (for

more details refer to POWER-DOWN MODE de-

scription on page 1-4).

This PDM command may only be issued when

the processor is in the IDLE mode (for an expla-

nation of the ISD-T360SB states, see “Command

Execution” on page 2–2). If it is necessary to

switch to power-down mode from any other

state, the controller must first issue a S (Stop)

command to switch the processor to the IDLE

state, and then issue the PDM command. Send-

ing any command while in power-down mode

resets the VoiceDSP processor detectors, and re-

turns it to normal operation mode.

NOTE Entering or exiting power-down mode can

distort the real-time clock by up to 500 µs.

Thus, to maintain the accuracy of the real-

time clock, enter or exit the power-down

mode as infrequently as possible.

2.2 PERIPHERALS

This section provides details of the peripherals in-

terface support functions and their principle op-

eration. It is divided into the following subjects:

• Microcontroller Interface (Slave

MICROWIRE)

• Memory Interface

• Codec Interface

2.2.1 MICROCONTROLLER INTERFACE

MICROWIRE/PLUS™ is a synchronous serial com-

munication protocol minimizes the number of

connections, and thus the cost, of communicat-

ing with peripherals.

The VoiceDSP MICROWIRE interface implements

the MICROWIRE/PLUS interface in slave mode,

with an additional ready signal. It enables a mi-

crocontroller to interface efficiently with the

VoiceDSP processor application.

The microcontroller is the protocol master and

provides the clock for the protocol. The VoiceD-

SP processor supports clock rates of up to 400

KHz. This transfer rate refers to the bit transfer; the

actual throughput is slower due to byte process-

ing by the VoiceDSP processor and the micro-

controller.

Communication is handled in bursts of eight bits

(one byte). In each burst the VoiceDSP proces-

sor is able to receive and transmit eight bits of

data. After eight bits have been transferred, an

internal interrupt is issued for the VoiceDSP pro-

cessor to process the byte, or to prepare another

byte for sending. In parallel, the VoiceDSP pro-

cessor sets MWRDY to 1, to signal the microcon-

troller that it is busy with the byte processing.

Another byte can be transferred only when the

MWRDY signal is cleared to 0 by the VoiceDSP

processor. When the VoiceDSP processor trans-

mits data, it expects to receive the value 0xAA

before each transmitted byte. The VoiceDSP

processor reports any status change by clearing

the MWRQST signal to 0.

If processor command’s parameter is larger than

one byte, the microcontroller transmits the Most

Significant Byte (MSB) first. If a return value is larg-

er than one byte, the VoiceDSP processor trans-

mits the MSB first.

The following signals are used for the interface

protocol. Input and output are relative to the

VoiceDSP processor.

2—SOFTWARE

ISD-T360SB

2-6

Voice Solutions in Silicon

™

INPUT SIGNALS

MWDIN

MICROWIRE Data In. Used for input only, for

transferring data from the microcontroller to the

VoiceDSP processor.

MWCLK

MICROWIRE Clock. Serves as the synchronization

clock during communication. One bit of data is

transferred on every clock cycle. The input data

is available on MWDIN and is latched on the

clock rising edge. The transmitted data is output

on MWDOUT on the clock falling edge. The sig-

nal should remain low when switching MWCS.

MWCS

MICROWIRE Chip Select. The MWCS signal is

cleared to 0, to indicate that the VoiceDSP pro-

cessor is being accessed. Setting MWCS to 1

causes the VoiceDSP processor to start driving

MWDOUT with bit 7 of the transmitted value. Set-

ting the MWCS signal resets the transfer-bit

counter of the protocol, so the signal can be

used to synchronize between the VoiceDSP pro-

cessor and the microcontroller.

To prevent false detection of access to the

VoiceDSP processor due to spikes on the MWCLK

signal, use this chip select signal, and toggle the

MWCLK input signal, only when the VoiceDSP

processor is accessed.

OUTPUT SIGNALS

MWDOUT

MICROWIRE Data Out. Used for output only, for

transferring data from the VoiceDSP processor to

the microcontroller. When the VoiceDSP proces-

sor receives data it is echoed back to the micro-

controller on this signal, unless the received data

is 0xAA. In this case, the VoiceDSP processor ech-

oes a command’s return value.

MWRDY

MICROWIRE Ready. When active (0), this signal

indicates that the VoiceDSP processor is ready to

transfer (receive or transmit) another byte of da-

ta.

This signal is set to 1 by the VoiceDSP processor

after each byte transfer has been completed. It

remains 1, while the VoiceDSP processor is busy

reading the byte, writing the next byte, or exe-

cuting the received command (after the last pa-

rameter has been received). MWRDY is cleared

to 0 after reset. For proper operation after a

hardware reset, this signal should be pulled up.

MWRQST

MICROWIRE Request. When active (0), this signal

indicates that new status information is avail-

able. MWRQST is deactivated (set to 1), after the

VoiceDSP processor receives a GSW (Get Status

Word) command from the microcontroller. After

reset, this signal is active (0) to indicate that a re-

set occurred. MWRQST, unlike all the signals of

the communication protocol, is an asynchro-

nous line that is controlled by the VoiceDSP firm-

ware.

SIGNAL USE IN THE INTERFACE PROTOCOL

After reset, both MWRQST and MWRDY are

cleared to 0.

The MWRQST signal is activated to indicate that

a reset occurred. The EV_RESET bit in the status

The GSW command should be issued after reset

to verify that the EV_RESET event occurred, and

to deactivate the MWRQST signal.

While the MWCS signal is active (0), the VoiceD-

SP processor reads data from MWDIN on every

rising edge of MWCLK. VoiceDSP processor also

writes every bit back to MWDOUT. This bit is either

the same bit which was read from MWDIN (in this

case it is written back as a synchronization echo

after some propagation delay), or it is a bit of a

value the VoiceDSP processor transmits to the

microcontroller (in this case it is written on every

falling edge of the clock).

2—SOFTWARE ISD-T360SB

2-7

ISD

When a command has more than one parame-

ter/return-value, the parameters/return-values

are transmitted in the order of appearance. If a

parameter/return-value is more than one byte

long, the bytes are transmitted from the most sig-

nificant to the least significant.

The MWRDY signal is used as follows:

1. Active (0) MWRDY signals the microcon-

troller that the last eight bits of data trans-

ferred to/from the voice module were

accepted and processed (see below).

2. The MWRDY signal is deactivated (set to 1

by the VoiceDSP processor) after 8-bits of

data were transferred to/from the

VoiceDSP processor. The bit is set follow-

ing the falling edge of the eighth MWCLK

clock-cycle.

3. The MWRDY signal is activated (cleared to

0) by the VoiceDSP processor when it is

ready to receive the first parameter byte

(if there are any parameters) and so on till

the last byte of parameters is transferred.

An active MWRDY signal after the last

byte of parameters indicates that the

command was parsed and (if possible)

executed. If that command has a return

value, the microcontroller must read the

value before issuing a new command.

4. When a return value is transmitted, the

MWRDY signal is deactivated after every

byte, and activated again when the

VoiceDSP processor is ready to send an-

other byte, or to receive a new com-

mand.

5. The MWRDY signal is activated (cleared to

0) after reset, and after a protocol time-

out. (See “INTERFACE PROTOCOL TIME-

OUTS” )

The MWRQST signal is used as follows:

1. The MWRQST signal is activated (cleared

to 0), when the status word is changed.

2. The MWRQST signal remains active (0), un-

til the VoiceDSP processor receives a GSW

command.

Figure 1-32 and Figure 1-33 illustrate the se-

quence of activities during a MICROWIRE data

transfer between VoiceDSP and the microcon-

troller.

INTERFACE PROTOCOL TIME-OUTS

Depending on the VoiceDSP processor’s state, if

more than 100 milliseconds elapse between the

assertion of the MWRDY signal and the transmis-

sion 8th bit of the next byte pertaining to the

same command transaction, a time-out event

occurs, and the VoiceDSP processor responds as

follows:

1. Sets the error bit in the status word to 1.

2. Sets the EV_TIMEOUT bit in the error word

to 1.

3. Activates the MWRQST signal (clears it to

0).

4. Activates the MWRDY signal (clears it to

0).

5. Waits for a new command. (After a time-

out occurs, i.e., the microcontroller re-

ceived MWRQST during the command

transfer, or result reception, the microcon-

troller must wait at least four milliseconds

before issuing the next command.)

ECHO MECHANISM

The VoiceDSP processor echoes back to the mi-

crocontroller all the bits received by the VoiceD-

SP processor. Upon detection of an error in the

echo, the microcontroller should stop the proto-

col clock, which eventually causes a time-out er-

ror (i.e., ERR_TIMEOUT bit is set in the error word).

NOTE When a command has a return value, the

VoiceDSP processor transmits bytes of the

return value instead of the echo value.

The VoiceDSP processor transmits a byte as an

echo when it receives the value 0xAA from the

microprocessor. Upon detection of an error the

VoiceDSP processor activates the MWRQST sig-

nal, and sets the ERR_COMM bit in the error

word.

2—SOFTWARE

ISD-T360SB

2-8

Voice Solutions in Silicon

™

2.2.2 MEMORY INTERFACE

DEVICE NUMBER AND TYPE

The VoiceDSP processor supports various types

of Flash memory and ARAM/DRAM devices. Up

to four devices may be connected to the

VoiceDSP, where all the connected devices

must be of the same type. Each memory device

may be of 4Mbit, 8Mbit or 16Mbit; thus a total of

64Mbit non-volatile memory may be connected

for message storage (up to 4 hours of voice re-

cording).

See “MEMORY INTERFACE” on page 1-6, for de-

tailed description of the supported Flash and

ARAM/DRAM devices and the hardware con-

nectivity.

Use the CFG command to define the type and

number of installed memory devices (see “CFG

Configure VoiceDSP config_value” on page 2-

25).

MEMORY DEVICE SIZE

The memory manager handles the memory de-

vices in basic units of 4Kbyts blocks. This ap-

proach is defined due to the nature of Flash

devices where the basic unit that can be erased

is a 4Kbytes block. This constraint is not relevant

for ARAM/DRAM devices, but the concept is

maintained for simplicity and consistency.

Memory blocks cannot be shared by different

voice messages. Therefore, the maximum num-

ber of messages per memory device, equals to

the number of memory blocks minus one (one

block per device is used for memory manage-

ment).

The size of the connected memory devices, is

defined by the number of memory blocks in

each device. Refer to tunable parameter index

62, in Table 2-10, for detailed description of the

available number of blocks for Flash and ARAM/

DRAM devices.

PRODUCTION LINE TESTING

In many cases it is desired to test the ISD-T360SB

in the production line as part of the whole appli-

cation. Usually in these cases, the testing time is

an important factor and should be minimized as

possible. The initialization time of the memory de-

vices is significant and should be avoided during

production (Refer to Table 1-4). Therefore, a

dedicated parameter is defined in order to allow

a production line testing while using a small part

of the real connected memory size.

It should be noted that in case of power failure

during the production line testing, the connect-

ed memory devices should be replaced, and

the process should be repeated. Refer to pa-

rameter index 63, in Table 2-10, for further expla-

nation of the production line testing.

ARAM QUALITY

ARAM is an Audio Grade RAM device, which im-

plies that some percentage of the ARAM bits are

defected and their content is undefined. Unlike

Flash devices, where the defected bits can be

mapped out, in case of ARAM specific bits can-

not be mapped out; only memory blocks can be

mapped out.

Therefore, it should be noted that using ARAM as

a voice storage device, will result in audible dis-

tortions. It is the user responsibility to define the

maximum allowed bad nibbles (4 bits) in a mem-

ory block. If the number of bad nibbles exceeds

the defined limitation, the specific block is

mapped out and is not used for message re-

cording. Refer to tunable parameter index 64, in

Table 2-10, for further details of the ARAM quality

level definition.

2—SOFTWARE ISD-T360SB

2-9

ISD

2.2.3 CODEC INTERFACE

SUPPORTED FUNCTIONALITY

The VoiceDSP processor supports analog and

digital telephony in various configurations. For

analog telephony the VoiceDSP operates in

master mode, where it provides the clock and

the synchronization signals. It supports a list of sin-

gle channel and dual channel codecs, as listed

in Table 1-7. For digital telephony the VoiceDSP

operates in slave mode, where the control sig-

nals are provided by an external source.

The codec interface is designed to exchange

data in short frame format as well as in long

frame format. The channel width may be either

8 bits (u-Law format or A-Law format), or 16 bits

(linear format). In slave mode the clock may be

divided by two, if required (two bit rate clock

mode).

The VoiceDSP support up to 2 voice channels,

where the line should be connected as channel

0 (in master mode or in slave mode - depends on

the configuration), and the speakerphone

(speaker and microphone) should be connect-

ed as channel 1 or as channel 2, depends on the

configuration (channel 1 and channel 2 are al-

ways connected as master).

See “The Codec Interface” on page 1-13, for de-

tailed description of the supported codec de-

vices and the hardware connectivity.

Use the CFG command to define the codec

mode (master or slave), the data frame format

(short or long), the channel width (8 bits or 16

bits), the clock bit rate (single or dual) and the

number and type of codecs (one or two, single

channel or dual channel). See “CFG Configure

VoiceDSP config_value” on page 2-25.

DATA CHANNELS TIMING

Especially in digital telephony, but also in analog

telephony when speakerphone is connected,

the channels data may be delayed from the

synchronization signal by variable number of

clock cycles. In order to allow full flexibility of the

data delay relative to the synchronization signal,

and the delay between the two synchronization

signals, a set of registers is provided. setting the

delay parameters of these registers defines the

exact timing of all the codec interface signals.

Refer to tunable parameters index 65 to index

69, in Table 2-11, for detailed description of the

delay registers and their significance.

2.3 ALGORITHM FEATURES

This section provides details of the VoiceDSP al-

gorithms and their principle operation. It is divid-

ed into the following subjects:

• VCD (Voice Compression and

Decompression)

• DTMF Detection

• Tone and Energy Detection (Call Progress)

• Speakerphone

• Speech Synthesis

2—SOFTWARE

ISD-T360SB

2-10

Voice Solutions in Silicon

™

2.3.1 VCD (VOICE COMPRESSION AND

DECOMPRESSION)

The VoiceDSP processor implements a state of

the art VCD algorithm of the CELP family. The al-

gorithm provides 3 compression rates that can

be selected dynamically (actually, the algorithm

supports more compression rates). PCM record-

ing (no compression) is also provided.

The lowest compression rate of 5.3 Kbit/s enables

about 30 minutes of recording on an 8-Mbit de-

vice (depending on the relative silence period).

The mid-quality compression rate of 9.9 Kbit/s

provides about 16 minutes of voice recording

time. The highest compression rate of 16.8 Kbit/s,

the highest quality recording, stores up to 10 min-

utes on a 8-Mbit device. For detailed information

about recording times refer to table 1-5.

Before recording each message, the microcon-

troller selects one of the three compression rates,

or PCM recording, with the compression_rate

parameter of the R (Record) command. During

message playback the VoiceDSP processor

reads this one byte parameter and selects the

appropriate speech decompression algorithm.

IVS vocabularies can be prepared in either of

the three compression rates, or in PCM format,

using the IVS tool. All messages in a single vocab-

ulary must be recorded using the same algo-

rithm. (See the

IVS User’s Guide

for more details).

During speech synthesis, the VoiceDSP processor

automatically selects the appropriate speech

decompression algorithm.

SILENCE COMPRESSION

A Voice Activity Detector (VAD) is used in order

to detect periods of silence during the compres-

sion of the recorded message. Silence is treated

differently than normal voice by the compres-

sion algorithm. It is compressed to about 1.0 Kbit/

s. The compressed silence contains data that al-

lows to generate comfort noise during message

playback. The comfort noise generation is impor-

tant because the human ear is not used to “real”

silence while listening to messages.

Various tunable parameters are available in or-

der to optimally tune the VAD. The silence com-

pression may be turned Off, though it is planned

to remain On continuously. For more details refer

to table 2-4 of the Command Description sec-

tion.

NOTE The silence compression should be turned

Off when ARAM devices are used for voice

storage. Otherwise, unpredictable results

are expected during message playback.

SW AGC

A SoftWare Automatic Gain Control (SW AGC)

algorithm is activated with the compression

module in order to regulate the input signal to a

dynamic range that will provide higher compres-

sion quality. The algorithm senses the energy lev-

el and updates the signal gain in order to amplify

low energy signals and to avoid signal satura-

tion. The SW AGC feature eliminates the need for

an external HW AGC, thus reducing hardware

costs and complexity. Hardware Gain Control

may be used to avoid signal saturation prior to

sampling the signal.

A tunable parameter determines the maximum

allowed gain for the SW AGC algorithm. The SW

AGC may be turned Off, though it is planned to

remain On continuously. For more details refer to

table 2-4 of the Command Description section.

VARIABLE SPEED PLAYBACK

This feature increases or decreases the speed of

messages and synthesized messages during

playback. Use the SPS (Set Playback Speed) to

set the speed of message playback. The new

speed applies to all recorded messages and syn-

thesized messages (only if synthesized using IVS),

until changed by another SPS command. If this

command is issued while the VoiceDSP proces-

sor is in the PLAY state, the speed also changes

for the message currently being played.

The speedup / slowdown algorithm is designed

to maintain the pitch of the original speech. This

approach provides the same speech tone while

playback speed varies.

2—SOFTWARE ISD-T360SB

2-11

ISD

PCM RECORDING

The VoiceDSP is capable of recording data in

PCM format (that is the original samples format

either in 8 bits u-Law format, 8 bit A-law format or

16 bits linear format). The PCM data uses more

storage space, but it provides the highest quality

for OGM, music-on-hold or IVS data. The PCM re-

cording may be selected as one of the available

compression rates during the R command

(compression_rate = 0).

Silence Compression and variable Speed Play-

back are not feasible during PCM recording and

playback since this feature skips the compres-

sion algorithm.

2.3.2 DTMF DETECTION

The VoiceDSP processor detects DTMF, which

enables remote control operations. Detection is

active throughout the operation of the VoiceD-

SP processor. Detection can be configured using

the SDET (Set Detectors Mask) command, which

controls the reporting of the occurrence of

tones, and the RDET (Reset Detectors) com-

mand which resets the detectors. The accuracy

of the tone length, as reported by the tone de-

tectors, is ±10 ms.

DTMF detection may be reported at the starting

point, ending point, or both. The report is made

through the status word (for further details, see

GSW command).

For further details about tunable parameters re-

fer to table 2-6 of the Command description sec-

tion.

The DTMF detector performance, as measured

on the line input using an ISD-DS360-DAA board,

is summarized below (see Table 2-1).

1. Performance depends on the DAA design. For reliable DTMF detection:

- A hardware echo-canceler, that attenuates the echo by at least 6 dBm, is required during playback.

- The HW AGC, if present, must be disabled during playback.

2. Performance with echo canceler is 10 dB better than without echo canceler. For a silent message, Detection

sensitivity is

−

34 dBm, with echo canceler.

3. Tune parameters 60 and 61 may improve DTMF detection sensitivity. for more details refer to the parameters

description in Table 2-6.

4. The accuracy of reported DTMF tones is ±10 ms.

5. If the interval between two consecutive identical DTMF tones is less than, or equal to, 20 ms, the two are detected

as one long DTMF tone. If the interval between two consecutive identical DTMF tones is between 20 ms and 45 ms,

separate detection is unpredictable.

6. Determined by the DTMF_REV_TWIST tunable parameter value.

Table 2-1: DTMF Detector Performance1

Play/IVS Synthesis Record/Idle

Detection Sensitivity Performance depends on the message being

played.2−34 dBm

Accepted DTMF Length3>50 ms >40 ms

Frequency Tolerance ±1.5% ±1.5%

S/N Ratio 12 dB 12 dB

Minimum Spacing4>50 ms >45 ms

Normal Twist 8 dB 8 dB

Reverse Twist54 dB or 8 dB 4 dB or 8 dB

2—SOFTWARE

ISD-T360SB

2-12

Voice Solutions in Silicon

™

DTMF SW AGC

In order to remove the linkage between the HW

AGC and the detection level of the DTMF detec-

tor, two new tunable parameters are added.

These tunable parameters define the gain of the

SW AGC for DTMF signals.

DTMF_DET_AGC_IDLE - SW AGC for DTMF detec-

tion in Idle and Record states. When increment-

ing this tunable by 1, the dynamic range is

increased by 3 dB.

DTMF_DET_AGC_PLAY - SW AGC for DTMF detec-

tion in Play and Tone_Generate states. When in-

crementing this tunable by 1, the dynamic range

is increased by 3 dB.

ECHO CANCELLATION

Echo cancellation is a technique used to im-

prove the performance of DTMF detection dur-

ing speech synthesis, tone generation, and

OGM playback. For echo cancellation to work

properly, HW AGC must not be active in parallel.

Thus, to take advantage of echo cancellation,

the microcontroller must control the HW AGC, if

exists, (i.e., disable the HW AGC during PLAY,

SYNTHESIS and TONE_GENERATE states and en-

able it again afterwards). If HW AGC can not be

disabled, do not use echo cancellation.

The microcontroller should use the CFG com-

mand to activate/deactivate echo cancella-

tion.

NOTE Normally, a HW AGC is not required with

The ISD-T360SB, since SW AGC is active for

the VCD algorithm, DTMF detection and

the speakerphone module.

2.3.3 TONE AND ENERGY DETECTION (CALL

PROGRESS)

The VoiceDSP processor detects busy and dial

tones, constant energy level, and no-energy

(VOX). This enables call progress tracking. De-

tection is active throughout the operation of the

VoiceDSP processor. Detection can be config-

ured using the SDET (Set Detectors Mask) com-

mand, which controls the reporting of the

occurrence of tones, and the RDET (Reset De-

tectors) command which resets the detectors.

The accuracy of the tone length, as reported by

the tone detectors, is ±10 ms.

TUNABLE PARAMETERS

Tunable parameters control the detection of

busy and dial tones, constant energy level (in

the frequency range 200–3400Hz), and no-ener-

gy. These parameters should be tuned to fit the

system hardware. In addition, changes may be

required to the tunable parameters according

to the setting (On or Off) of the HW Automatic

Gain Control (HW AGC), if exists. For more infor-

mation refer to tables 2-7, 2-8 of the Command

Description section.

2—SOFTWARE ISD-T360SB

2-13

ISD

Figure 2-1: Busy and Dial-Tone Band-Pass Filter Frequency Response

BUSY AND DIAL TONES

Busy and dial-tone detectors work with a band-

pass filter that limits the frequency range in

which tones can be detected to 0–1100Hz.

Figure 1-1 shows the frequency response of this

band-pass filter.

The design of the busy-tone detector allows very

high flexibility in detecting busy tones with vary-

ing cadences.

The tunable parameters are divided into five

sets:

1. Busy Tone On-time and Off-time Range

Specification:

BUSY_DET_MIN_ON_TIME

BUSY_DET_MIN_OFF_TIME

BUSY_DET_MAX_ON_TIME

BUSY_DET_MAX_OFF_TIME

2. Busy Tone Cadence Control Specification

BUSY_DET_VERIFY_COUNT

BUSY_DET_TONE_TYPE

BUSY_DET_DIFF_THRESHOLD

BUSY_DET_VERIFY_COUNT determines the

number of On/Off cadences that detec-

tor should detect before reporting busy

tone presence.

BUSY_DET_DIFF_THRESHOLD describes the

maximum allowed difference between

two compared On or Off periods, as de-

termined by the BUSY_DET_TONE_TYPE

tunable parameter.

BUSY_DET_TONE_TYPE specifies the type of

cadences that are supported.

Legal values are:

Two cadences only

Three cadences only

Both two and three cadences.

The acceptance criteria for two cad-

ences:

[E1–E3] < BUSY_DET_DIFF_THRESHOLD

and

[S1–S3] < BUSY_DET_DIFF_THRESHOLD

The acceptance criteria for three

cadences:

[E1–E4] < BUSY_DET_DIFF_THRESHOLD

and

[S1–S4] < BUSY_DET_DIFF_THRESHOLD

3. Busy and Dial Tone Energy Thresholds

TONE_DET_ON_ENERGY THRESHOLD

TONE_DET_OFF_ENERGY THRESHOLD

4. Busy Detection Time

BUSY_DET_MIN_TIME

0 200 400 600 800 1000 1200 1400 1600 1800 2000

Frequency (Hz)

–40

–30

–20

–10

Magnitude dB

2—SOFTWARE

ISD-T360SB

2-14

Voice Solutions in Silicon

™

Figure 2-2: Busy-Tone Detector—Default Cadence Specification

CONSTANT ENERGY

The constant-energy detector reports the pres-

ence of constant energy in the range 200Hz to

3400Hz. It is intended to detect both white and

pink noise and can be used to detect line dis-

connection during recording.

It is recommend to use the constant energy

mechanism in conjunction with the no-energy

(VOX) mechanism.

The following tunable parameters control the

operation of the constant-energy detector:

CONST_NRG_DET_TIME_COUNT

CONST_NRG_DET_TOLERANCE_TIME

CONST_NRG_DET_LOW_THRESHOLD

CONST_NRG_DET_HIGH_THRESHOLD

NO ENERGY (VOX)

The no-energy detector reports when the energy

in the frequency range 200Hz to 3400Hz remains

below a preprogrammed threshold for a prepro-

grammed time-out. A programmable tolerance

is allowed.

It is recommend to use the no-energy (VOX)

mechanism in conjunction with the constant-en-

ergy mechanism.

The following tunable parameters control the

operation of the no-energy (VOX) mechanism:

VOX_DET_ENERGY_THRESHOLD

VOX_DET_TIME_COUNT

VOX_DET_TOLERANCE_TIME

2.3.4 FULL-DUPLEX SPEAKERPHONE

The speakerphone feature lets the user commu-

nicate through a telephone line, using the unit’s

speaker and the microphone instead of its hand-

set. The speakerphone processes signals sent

from the line to the speaker, and from the micro-

phone to the line. It also performs the necessary

switching, attenuation and echo cancellation

on the signals present on the line/speaker.

The ISD-T360SB speakerphone is simple to use; it

requires no special hardware or training for the

echo cancelers. The gain control is fully digital,

which eliminates the need for analog gain con-

trol hardware.

The speakerphone features two types of echoes,

the electrical echo (line or circuit) and the

acoustic echo. The electrical echo is a result of

an imperfect impedance match between the 4-

to 2-wire interface (hybrid) and the line imped-

ance. The electrical echo, relatively short term,

has a transfer function that varies slowly. The

second echo, the acoustic echo, is a line imped-

ance returning from the speaker to the micro-

phone. This echo is relatively long term, and its

transfer function may vary quite quickly if

anyone, or anything, moves in the room. Both

echoes must be canceled to achieve a high-

quality hands-free system.

For more details of the speakerphone tunable

parameters refer to table 2-9 of the Command

Description section.

E1E2E3

S1S2S3

[E1 – E3] < 100 ms [S1 – S3] < 100 ms 100 < Ei < 1680 ms 70 < Si < 1220 ms

2—SOFTWARE ISD-T360SB

2-15

ISD

SPEAKERPHONE TERMINOLOGY

Send Path

The signal path from the microphone (near-end

speaker) to the line (far-end listener). The micro-

phone is the input port, and line-out is the output

port of this signal path.

Receive Path

The signal path from the line (far-end speaker) to

the loudspeaker (near-end listener). The line-in is

the input port, and the speaker is the output port

for this signal path.

AEC

Acoustic Echo Controller. The part in the speak-

erphone algorithm that controls the echo in the

sendpath.

EEC

Electric Echo Controller. The part in the speaker-

phone algorithm that controls the echo in the re-

ceive path.

SPEAKERPHONE MODES OF OPERATION

Full-Duplex (ON)

The speakerphone works in full-duplex mode,

meaning both parties can speak and hear each

other simultaneously. In this mode both the

acoustic and electric echo controllers are ac-

tive. The VoiceDSP processor tone detectors are

not active in this mode.

Mute

In this mode of operation, the speakerphone

generates silence to the line. The near-end listen-

er can hear the far-end speaker but not vice ver-

sa. Tone detectors are not active.

Hold

During Hold mode interrupts from both codecs

are stopped. Neither side can hear each other.

Restart

In Restart mode the speakerphone re-initializes it-

self to the last speakerphone mode (full-duplex,

transparent or mute). This mode should be used

to resume the speakerphone operation after

Hold mode or when there is a significant change

in the environmental conditions (e.g., parallel

pickup) that may affect the speakerphone qual-

ity.

Transparent

While in Transparent mode, the speakerphone

works in full-duplex mode but without echo can-

cellation.

Samples from the microphone are transferred to

the line, and samples from the line are trans-

ferred to the speaker, with no processing. This

mode should be used only for tuning and testing

the system.

Listen

In Listen mode the line is audible on the speaker,

and the processor tone detectors are active.

During Listen mode, dialing with the GT com-

mand and call progress is possible, since the

busy and dial tone detectors are active.

The following pseudo-code demonstrates how

to make a call from speakerphone mode:

2—SOFTWARE

ISD-T360SB

2-16

Voice Solutions in Silicon

™

Figure 2-3: Speakerphone Pseudo Code Representation

2.3.5 SPEECH SYNTHESIS

Speech synthesis is the technology used to cre-

ate messages out of predefined words and

phrases stored in a vocabulary.

There are two kinds of predefined messages:

fixed messages (voice menus in a voice-mail sys-

tem) and programmable messages (time-and-

day stamp, or the

You have n messages

an-

nouncement in a DTAD).

A vocabulary includes a set of predefined words

and phrases, needed to synthesize messages in

any language. Applications which support more

than one language require a separate vocabu-

lary for each language.

INTERNATIONAL VOCABULARY SUPPORT (IVS)

IVS is a mechanism by which the VoiceDSP pro-

cessor utilizes several vocabularies stored on an

external storage device. IVS enables the ISD-

T360SB to synthesize messages with the same

meaning, but in different languages, from sepa-

rate vocabularies.

IVS Features

• Multiple vocabularies stored on a single

storage device.

• Plug-and-play. The same microcontroller

code is used for all languages.

• Synthesized and recorded messages use

the same voice compression algorithm to

achieve equal quality.

• Argumented sentences. (For example:

You have <n> messages

while () {

EV = wait_event()

case EV of:

skpr_button_pressed:

if (speakerphone_on) {

SSM 0 // Put VoiceDSP in idle mode

first_digit = TRUE

deactivate_digit_timeout_event()

elseSSM 1 // Put VoiceDSP in full-duplex speakerphone mode

digit_pressed:

if (first_digit) {

SSM 4 // Enter LISTEN mode

first_digit = FALSE

}

GT <dtmf_of_digit> // Dial the digit

S // Stop. Note that after the S command

// the VoiceDSP is still in speakerphone mode

enable_digit_timeout_event() // To "guess" when dialing is completed.

digit_timeout_event:

SSM 1 // Dialing is completed, Go back to full-duplex mode

deactivate_digit_timeout_event()

}

2—SOFTWARE ISD-T360SB

2-17

ISD

• Auto-synthesized time-and-day stamp

(driven by the VoiceDSP processor’s

clock).

• Support for various language and

sentence structures:

– One versus many. (For example:

You

have one message

versus

You

have two messages

– None versus many. (For example:

You have no messages

versus

You

have two messages

– Number synthesis (English

—Eighty

versus French—

Quatre-vingt

– Word order (English—

Twenty-one

versus German—

Einundzwanzig

– Days of the week (Monday through

Sunday versus Sunday through

Saturday).

VOCABULARY DESIGN

There are several issues, sometimes conflicting,

which must be addressed when designing a vo-

cabulary.

Vocabulary Content

If memory space is not an issue, the vocabulary

could contain all the required sentences, each

recorded separately.

If memory space is a concern, the vocabulary

must be compact; it should contain the mini-

mum set of words and phrases required to syn-

thesize all the sentences. The least memory is

used when phrases and words that are common

to more than one sentence are recorded only

once, and the IVS tool is used to synthesize sen-

tences out of them.

A good combination of sentence quality and

memory space is achieved if you take the “com-

pact” approach, and extend it to solve pronun-

ciation problems. For example, the word twenty

is pronounced differently when used in the sen-

tences

You have twenty messages

and

You

have twenty-two messages

. To solve this prob-

lem, words that are pronounced differently

should be recorded more than once, each in

the correct pronunciation.

Vocabulary Recording

When recording vocabulary words, there is a

compromise between space and quality. On

one hand, the words should be recorded and

saved in a compressed form, and you would like

to use the best voice compression for that pur-

pose. On the other hand, the higher the com-

pression rate, the worse the voice quality.

Another issue to consider is the difference in

voice quality between synthesized and record-

ed messages (e.g., between time-and-day

stamp and ICMs in a DTAD environment). It is

more pleasant to the human ear to hear both

messages have the same sound quality.

Vocabulary Access

Sometimes compactness and high quality are

not enough. There should be a simple and flexi-

ble interface to access the vocabulary ele-

ments. Not just the vocabulary but the code to

access the vocabulary should be compact.

When designing for a multi-lingual environment,

there are even more issues to consider. Each vo-

cabulary should be able to handle language-

specific structures and designed in a coopera-

tive way with the other vocabularies so that the

code to access each vocabulary is the same.

When you use the command to synthesize the

sentence

Monday. 12:30 P.M.,

you should not

care in what language it is going to be played

back.

IVS VOCABULARY COMPONENTS

This section describes the basic concept of an

IVS vocabulary, its components, and the rela-

tionships between them.

2—SOFTWARE

ISD-T360SB

2-18

Voice Solutions in Silicon

™

Basic Concepts

An IVS vocabulary consists of words, sentences,

and special codes that control the behavior of

the algorithm which VoiceDSP processor uses to

synthesize sentences.

Word Table

The words are the basic units in the vocabulary.

Create synthesized sentences by combining

words in the vocabulary. Each word in the vo-

cabulary is given an index which identifies it in

the word table.

Note that, depending on the language struc-

tures and sentences synthesized, you may need

to record some words more than once in the vo-

cabulary. For example, if you synthesize the sen-

tences:

you have twenty messages

and

you

have twenty-five messages

, the word

twenty

pronounced differently. They should, therefore,

be defined as two different words.

Number Tables

The number tables allow you to treat numbers

differently depending on the context.

Example 1: The number 1 can be announced as

one

as in

message number one

or as first as in

first

message

Example 2: The number 0 can be announced as

as in

you have no messages

or as

as in

monday, eight oh five A.M

A separate number table is required for each

particular type of use. The number table con-

tains the indices of the words in the vocabulary

that are used to synthesize the number. Up to

nine number tables can be included in a vocab-

ulary.

Sentence Table

The sentence table describes the predefined

sentences in the vocabulary. The purpose of this

table is to make the microcontroller that drives

the VoiceDSP processor independent of the lan-

guage being synthesized. For example, if the

Flash and/or ROM memory contain vocabularies

in various languages, and the first sentence in

each vocabulary means you have n messages,

the microcontroller switches languages by issu-

ing the following command to VoiceDSP proces-

sor:

SV <storage_media>, <vocabulary_id> -Select

a new vocabulary

The microcontroller software is thus independent

of the grammar of the language in use. The sen-

tences consist of words, which are represented

by their indices in the vocabulary.

Sentence 0

All sentences but one are user defined. The

VoiceDSP processor treats the first sentence in

the sentence table (sentence 0) specially, to

support time-and-day stamp. The processor as-

sumes that the sentence is designed for both sys-

tem time, and message time-and-day stamp

announcement, and has one argument which is

interpreted as follows:

0 System time is announced

1 The time-and-day stamp of the cur-

rent message is announced.

Example 1: When the microcontroller sends the

command: SAS 0, 0

The system time and day is announced.

Example 2: When the microcontroller sends the

command: SAS 0, 1

The current message time-and-day stamp

is announced.

The following Figure 2-4 shows the interrelation-

ship between the three types of tables.

2—SOFTWARE ISD-T360SB

2-19

ISD

Figure 2-4: The Interrelationship between the Word, the Number, and the Sentence Tables

Control and Option Codes

The list of word indices alone cannot provide the

entire range of sentences that the VoiceDSP pro-

cessor is able to synthesize. IVS control and op-

tion codes send special instructions to control

the speech synthesis algorithm’s behavior in the

processor.

For example, if the sentence should announce

the time of day, the VoiceDSP processor should

be able to substitute the current day and time in

the sentence. These control words do not repre-

sent recorded words, rather they instruct the pro-

cessor to take special actions.

THE IVS TOOL

The IVS tool includes two utilities:

1. The DOS-based IVS Compiler

2. IVSTOOL for Windows. A Windows 3.1/95

based utility

The tools help create vocabularies for the

VoiceDSP processor. They take you from design-

ing the vocabulary structure, through defining

the vocabulary sentences, to recording the vo-

cabulary words.

IVS Compiler

The IVS compiler runs on MS-DOS (version 5.0 or

later) and enables you to insert your own vocab-

ulary, (i.e., basic words and data used to create

numbers and sentences, as directories and files

in MS-DOS). The IVS compiler then outputs a bi-

nary file containing that vocabulary. In turn, this

information can be burned into an EPROM or

Flash memory to be used by the VoiceDSP soft-

ware.

NOTE The IVS data cannot be stored in EPROM

when semi-parallel Flash is used (Samsung

or Toshiba).

IVS Voice Compression

Each IVS vocabulary can be compiled with ei-

ther the 5.3 Kbit/s, the 9.9 Kbit/s or the 16.8Kbit/s

voice compression algorithm, or in PCM format.

Define the compression rate before compilation.

The VoiceDSP processor automatically selects

the required voice decompression algorithm

when the SV command chooses the active vo-

cabulary.

Sentence Table

Number Table

Word Table

You have OPT_NUMBER CONTROL_SING MESSAGES

five

twenty

You have

messages

message

2—SOFTWARE

ISD-T360SB

2-20

Voice Solutions in Silicon

™

Graphical User Interface (GUI)

The IVS package includes a Windows utility to as-

sist the vocabulary designer to synthesize sen-

tences. With this utility, you can both compose

sentences and listen to them.

HOW TO USE THE IVS TOOL WITH THE

VOICEDSP PROCESSOR

The IVS tool creates IVS vocabularies, and stores

them as a binary file. This file is burnt into a ROM

device or programmed into a Flash memory de-

vice using the INJ (Inject IVS) command. The

VoiceDSP processor SO (Say One Word) com-

mand is used to select the required vocabulary.

The SW (Say Words), SO, SS (Say Sentence) and

SAS (Say Argumented Sentence) commands are

used to synthesize the required word or sen-

tence. The typical vocabulary-creation process

is as follows:

1. Design the vocabulary.

2. Create the vocabulary files (as described

in detail below). Use VISTULA for Windows

3.1/95 to simplify this process.

3. Record the words using any standard PC

sound card and sound editing software,

that can create .wav files.

4. Run the IVS compiler to compress the

.wav files, and compile them and the vo-

cabulary tables into an IVS vocabulary

file.

5. Repeat steps 1 to 4 to create a separate

IVS vocabulary for each language that

you want to use.

6. Burn the IVS vocabulary files into a ROM

(or Flash memory) device. Use the INJ (In-

ject IVS) command to program the data

into a Flash device.

NOTE The IVS data cannot be stored in EPROM

when semi-parallel Flash is used (Samsung

or Toshiba).

Once the vocabulary is in place, the speech syn-

thesis commands of the VoiceDSP processor can

be used to synthesize sentences.

Figure 2-5 shows the vocabulary-creation pro-

cess for a single table on a ROM or Flash memory

device.

Figure 2-5: Creation of an IVS Vocabulary

.wav Files

Number

Tables

Sentence

Table

Sound

Card

Editor

IVS

Compressed

Files (.vcd)

IVS Vocabulary

Files

ROM

Programmer

ROM

.wav File

Editor

IVSTOOL

for

Windows

Flash

INJ

Command

.ini File

Compiler

2-21

2—SOFTWARE ISD-T360SB

ISD

2.4 VOICEDSP PROCESSOR COMMANDS—QUICK REFERENCE TABLE

Table 2-2: Speech Commands

Command Description Opcode

Hex Source State Result

State

Command Parameters Return Value

Name S/A Description Bytes Description Bytes

CCIO SConﬁgure

Codec I/O 34 RESET, IDLE No change Conﬁg_value 1None -

CFG SConﬁgure

VoiceDSP 01 RESET No change Conﬁg_value 3None -

CMSG SCreate

Message 33 IDLE MSG_OPEN Tag, Num_of_

blocks 2+2 None -

CMT SCut Message

Tail 26 IDLE No change Time_length 2None -

CVOC SCheck

Vocabulary 2B IDLE No change None -Test result 1

DM SDelete

Message 0A IDLE No change None -None -

DMS SDelete

Messages 0B IDLE No change Tag_ref,

Tag_mask 2 + 2 None -

GCFG SGet

Conﬁguration

Value

02 RESET, IDLE No change None - Version 1

GEW SGet Error Word 1B All states No change None -Error word 2

GI SGet Information

item 25 PLAY, RECORD,

SYNTHESIS, TONE_

GENERATE, IDLE

No change Item 1Item value 2

GL SGet Length 19 IDLE No change None -Message

length 2

GMS SGet Memory

Status 12 IDLE No change None -Recording

time left 2

GMT SGet Message

Tag 04 IDLE No change None -Message tag 2

GNM SGet Number of

Messages 11 IDLE No change Tag_ref,

Tag_mask 2 + 2 Number of

messages 2

GSW SGet Status

Word 14 All states No change None -Status word 2

GT AGenerate Tone 0D IDLE TONE_

GENERATE Tone

(single Tone or

DTMF)

1None -

GTD SGet Time and

Day 0E IDLE No change Time_day_

option 1Time and day 2

GTM SGet Tagged

Message 09 IDLE No change Tag_ref,

Tag_mask,Dir 2+2+1 Message

found 1

GTUNE SGet Tunable

Parameter 06 IDLE, RESET No change Index 1 Parameter_

value 2

INIT SInitialize System 13 RESET, IDLE IDLE None -None -

INJ SInject IVS data 29 IDLE No change N,

byte1...byten

4 + n None -

MR SMemory Reset 2A RESET, IDLE No change None -None -

PAPlayback 03 IDLE PLAY None -None -

2-22

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

PA SPause 1C PLAY, RECORD,

SYNTHESIS,

TONE_GENERATE,

IDLE*

No change None -None -

PDM SGo To Power-

Down Mode 1A IDLE No change None -None -

RARecord

Message 0C IDLE RECORD Tag (message

Tag),

Compression_

rate

2 + 1 None -

RDET SReset Detectors 2C IDLE No change Detectors_

reset_mask 1None -

RES SResume 1D PLAY, RECORD,

SYNTHESIS,

TONE_GENERATE

IDLE*

No change None -None -

RMSG SRead Message 32 IDLE, MSG_OPEN MSG_OPEN None -Data 32

SSStop 00 All states but

RESET IDLE None -None -

SAS ASay

Argumented

Sentence

1E IDLE SYNTHESIS Sentence_n,

Arg 1 + 1 None -

SB SSkip Backward 23 PLAY, IDLE* No change Time_length 2None -

SDET SSet Detectors

Mask 10 IDLE No change Detectors_

mask 1None -

SE SSkip to End of

Message 24 PLAY, IDLE* No change None -None -

SETD SSet Time and

Day 0F IDLE No change Time_and_

day 2None -

SF SSkip Forward 22 PLAY, IDLE* No change Time_length 2None -

SMSG SSet Message

Pointer 30 IDLE, MSG_OPEN MSG_OPEN Num_of_

pages 2None -

SMT SSet Message

Tag 05 IDLE No change Message_tag 2None -

SO ASay One Word 07 IDLE SYNTHESIS Word_number 1None -

SPS SSet Playback

Speed 16 PLAY, SYNTHESIS,

IDLE No change Speed 1None -

SS ASay Sentence 1F IDLE SYNTHESIS Sentence_n 1None -

Table 2-2: Speech Commands (Continued)

Command Description Opcode

Hex Source State Result

State

Command Parameters Return Value

Name S/A Description Bytes Description Bytes

2-23

2—SOFTWARE ISD-T360SB

ISD

NOTE: * Command is valid in IDLE state, but has no effect.

S = Synchronous command

A= Asynchronous command

NOTE: * Command is valid in IDLE state, but has no effect.

S = Synchronous command

A = Asynchronous command

SV S Set

Vocabulary

Type

20 IDLE No change Type, Id 1 + 1 None -

SW A Say Words 21 IDLE SYNTHESIS N,

word1...word

1 + N None -

TUNE S Tune

Parameters

15 IDLE, RESET No change Index,

Parameter_

value

1 + 2 None -

VC S Volume

Control

28 PLAY,

SYNTHESIS, IDLE,

TONE_GENERAT

No change Vol_level

(increment/

decrement)

1 None -

WMSG S Write Message 31 IDLE,

MSG_OPEN

MSG_OPEN Data 32 None -

Table 2-3: Speakerphone Commands

Command Description Opcode

Hex Source State Result

State

Command Parameters Return Value

Name S/A Description Bytes Description Bytes

GEW S Get Error Word 1B TONE_GENERAT

E, IDLE

change

None - Error word 2

GSW S Get Status

Word

14 TONE_GENERAT

E, IDLE

change

None - Status word 2

GT A Generate

Tone

0D IDLE TONE_GE

NERATE

Tone

(Single Tone or

DTMF)

1 None -

RDET S Reset

Detectors

2C IDLE No

change

Detectors_res

et_mask

1 None -

S S Stop 00 TONE_GENERAT

E, IDLE

IDLE None - None -

SDET S Set Detectors

Mask

10 IDLE No

change

Detectors_

mask

1 None -

SSM S Set

Speakerphon

e Mode

2F IDLE No

change

Mode 1 None -

VC S Volume

Control

28 TONE_GENERAT

E, IDLE

change

Vol_level

(increment/

decrement)

1 None -

Table 2-2: Speech Commands (Continued)

Command Description Opcode

Hex Source State Result

State

Command Parameters Return Value

Name S/A Description Bytes Description Bytes

2-24

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

2.5 COMMAND DESCRIPTION

The commands are listed in alphabetical order.

The execution time for all commands, when specified, includes the time required for the microcontrol-

ler to retrieve the return value, where appropriate.

The execution time does not include the protocol timing overhead, i.e., the execution times are mea-

sured from the moment that the command is detected as valid until the command is fully executed.

NOTE: Each command description includes an example application of the command. The examples show the

opcode issued by the microcontroller and the response returned by the VoiceDSP processor. For com-

mands which require a return value from the processor, the start of the return value is indicated by a thick

vertical line.

CCIO Conﬁgure Codec I/O

conﬁg_value

Configures the voice sample paths in various states. It should be used to change the default VoiceDSP

processor configuration. It is relevant only when two codecs are used and speakerphonr is connect-

ed.

The

config_value

parameter is encoded as follows:

Bit 0

Loopback control.

0 Loopback disabled (default).

1 Loopback enabled. In the RECORD state, the input samples are echoed back, un-

changed (i.e., no volume control), to the same codec.

Bit 1

Codec input control.

0 Input is received via the line codec (default).

1 Input is received via the speakerphone codec.

Bits 2–3

Codec output control.

00 In PLAY, IDLE, SYNTHESIS and TONE_GENERATE states, output is to both codecs. In

RECORD state, output is to the non-input codec (no volume control). If the loopback

control bit is set, output in RECORD state is to both codecs as well (default).

01 Output in all states is to the line codec.

10 Output in all states is to the speakerphone codec.

11 Output in all states is to both codecs.

2-25

2—SOFTWARE ISD-T360SB

ISD

Bits 4–7

Reserved.

Example

CFG Conﬁgure VoiceDSP

conﬁg_value

Configures the VoiceDSP processor in various hardware environments. It should be used to change

the default processor configuration.

The

config_value

parameter is encoded as follows:

Bits 0–3

Memory type.

0000 No Memory (default).

0001 A/DRAM.

0010 Reserved.

0011 Toshiba Serial Flash.

0100 Samsung Semi-Parallel Flash.

0101 Toshiba Semi-Parallel Flash.

0110 Reserved.

0111 Reserved.

Bits 4–5

Number of installed memory devices.

00 1 (Default)

01 2

10 3

11 4

Bit 6-14

Reserved.

Bit 15

Echo Cancellation Control (for DTMF Detection).

0 Echo cancellation off (default).

1 Echo cancellation is on during playback.

CCIO 01

Byte sequence: Microcontroller 34 01

VoiceDSP 34 01

Description: Enable loopback

2-26

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Echo cancellation improves the performance of DTMF detection during playback. Echo cancellation

can be turned on only with a system that can disable HW AGC (if present) during playback. A system

featuring HW AGC, that cannot be controlled by the microcontroller (i.e., disabled or enabled), must

not turn on this bit.

Bit 16

Clock bit rate (in Slave Mode only).

0 One bit rate clock (default).

1 Two bit rate clock.

Bit 17

Codec configuration.

0 Short-frame format (default).

1 Long-frame format (guaranteed by design but not tested).

Bits 18–19

Codec type.

00 16-bit linear (default).

01 µ-Law.

10 A-Law.

Bit 20

Codec interface mode.

0 Master codec interface (default).

1 Slave codec interface.

Bits 21–22

Number and type of codecs

00 One single codec (default).

01 Two single codecs.

10 One dual codec.

11 Reserved.

The codecs should be connected as follows:

Telephone line or equivalent - always connected as channel 0.

Speaker and microphone - connected as channel 1 in case of one dual codec (not applicable in

slave mode), connected as channel 2 in case of two single codecs.

2-27

2—SOFTWARE ISD-T360SB

ISD

Bit 23

Reserved.

Example

CMSG Create Message

tag

num_of_blocks

Creates a new message with a message tag

tag

, allocates

num_of_blocks

4-Kbytes blocks for the new

message, and sets the message pointer to the beginning of the message data. CMSG switches the

VoiceDSP processor to the MSG_OPEN state.

The memory space available for the message data is computed as follows:

(127 x

num_of_blocks

– 2) x 32 bytes.

Once a message is open (the processor is in the MSG_OPEN state), the message pointer can be set to

any position on a page (32 bytes) boundary within the message with the SMSG command. Modify the

message contents with the WMSG command, and read with the RMSG command.

The microcontroller must issue an S command to close the message and switch the VoiceDSP proces-

sor to the IDLE state.

If the memory is full, EV_MEMFULL is set in the status word and no message is created. If the memory is

not full but there is insufficient memory and the processor cannot allocate more memory space,

EV_MEMLOW is set in the status word and no message is created.

Example

CFG 144013

Byte sequence: Microcontroller 01 14 40 13

VoiceDSP 01 14 40 13

Description: Conﬁgure the VoiceDSP to work with:

Single codec in Slave Mode and A-Law compressed samples.

Data in Short Frame format and Single Bit Rate interface.

Two Serial Toshiba Flash devices.

Echo Cancellation for DTMF detectiopn is On.

CMSG 0101 0001

Byte sequence: Microcontroller 33 01 01 00 01

VoiceDSP 33 01 01 00 01

Description: Create a new message with a tag=0101, and allocate 1 block (4 Kbytes) for its data.

2-28

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

CMT Cut Message Tail

time_length

Cut

time_length

units, in 10 ms segments, off the end of the current message. The maximum value of

time_length

is 6550. In case of silence, cut-time accuracy is 0.1 to 0.2 seconds (depends on compres-

sion rate).

NOTE If time_length is longer than the total duration of the message, the EV_NORMAL_END event is set in

the status word and the message becomes empty but not deleted. Use the DM (Delete Message),

or DMS (Delete Messages), command to delete the message.

A compressed frame represents 21 ms of speech, thus the minimum meaningful parameter is 3, (i.e.,

a 30 ms cut).

CMT 1 or CMT 2 have no effect.The CMT command can not be used on data messages

Example

CVOC Check Vocabulary

Checks (checksum) if the IVS data was correctly programmed to the ROM or Flash device.

If the vocabulary data is correct the return value is 1. Otherwise the return value is 0. If the current vo-

cabulary is undefined, ERR_INVALID is reported.

Example

DM Delete Message

Deletes the current message. Deleting a message clears its message tag.

Deleting the current message does not cause a different message to become current. The current

message is undefined. If, for example, you issue the GTM command to skip to the next message, the

first message that is newer than the just deleted message is selected as the current message.

The memory space released by the deleted message is immediately available for recording new mes-

sages.

CMT 02BC

Byte sequence: Microcontroller 26 02 BC

VoiceDSP 26 02 BC

Description: Cut the last seven seconds of the current message.

CVOC

Byte sequence: Microcontroller 2B AA

VoiceDSP 2B 01

Description: Check the current vocabulary.

The VoiceDSP processor responds that the vocabulary is OK.

2-29

2—SOFTWARE ISD-T360SB

ISD

Example

DMS Delete Messages

tag_ref tag_mask

Deletes all messages whose message tags match the tag_ref parameter. Only bits set in tag_mask are

compared i.e., a match is considered successful if:

message tag

and

tag_mask

tag_ref

and

tag_mask

where and is a bitwise AND operation.

After the command completes execution, the current message is undefined. Use the GTM command

to select a message to be the current message.

The memory space released by the deleted message is immediately available for recording new mes-

sages.

Example

GCFG Get Conﬁguration Value

Returns a sequence of one byte with the following information:

Bits 0–7

Magic number, which specifies the VoiceDSP firmware version.

Byte sequence: Microcontroller 0A

VoiceDSP 0A

Description: Delete current message.

DMS FFC2 003F

Byte sequence: Microcontroller 0B FF C2 00 3F

VoiceDSP 0B FF C2 00 3F

Description: Delete all old incoming messages from mailbox Number 2 in a system where the

message tag is encoded as follows:

Bits 0–2: mailbox ID

8 mailboxes indexed: 0 to 7

Bit 3: new/old message indicator

0—Message is old

1—Message is new

Bits 4–5: message type

00—ICM/memo

01—OGM

10—Call transfer message

Bits 6–15: not used

Note: the description of the tag is an example only. All bits of the tag are user-deﬁnable.

2-30

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Example

GEW Get Error Word

Returns the 2-byte error word.

ERROR WORD

The 16-bit error word indicates errors that occurred during execution of the last command. If an error

is detected, the command is not processed; the EV_ERROR bit in the status word is set to 1, and the

MWRQST signal is activated (set to 0).

The GEW command reads the error word. The error word is cleared during reset and after execution

of the GEW command.

If errors ERR_COMMAND or ERR_PARAM occur during the execution of a command that has a return

value, the return value is undefined. The microcontroller must still read the return value, to ensure prop-

er synchronization.

The bits of the error word are used as follows:

ERR_OPCODE

Illegal opcode. The VoiceDSP processor does not recognize the opcode.

ERR_COMMAND

Illegal command sequence. The command is not legal in the current state.

ERR_PARAM

Illegal parameter. The value of the parameter is out of range, or is not appropriate for the command.

ERR_COMM

Microcontroller MICROWIRE communication error.

GCFG

Byte sequence: Microcontroller 02 AA

VoiceDSP 02 01

Description: Get the VoiceDSP processor magic number.

The VoiceDSP processor responds that it is Version 1.

159876543 2 10

Res Res ERR_

INVALID ERR_

TIMEOUT ERR_

COMM Res ERR_

PARAM ERR_

COMMAND ERR_

OPCODE Res

2-31

2—SOFTWARE ISD-T360SB

ISD

ERR_TIMEOUT

Time-out error. Depending on the VoiceDSP processor’s state, more than 100 milliseconds elapsed be-

tween the arrival of two consecutive bytes (for commands that have parameters).

ERR_INVALID

Command can not be performed in current context.

Example

GI Get Information

item

Returns the 16-bit value specified by item from one of the internal registers of the VoiceDSP processor.

item may be one of the following:

0 The duration of the last detected DTMF tone, in 10 ms units. The return value is meaningful

only if DTMF detection is enabled, and the status word shows that a DTMF tone was de-

tected.

1 The duration of the last detected busy tone in 10 ms units.

2 The energy level of the samples in the last 10 ms.

3 The energy level of the samples, in the last 10 ms, that are in the frequency range de-

scribed in Figure 2-1. The return value is meaningful only if one of the tone detectors is

enabled (bits 0,1 of the detectors mask; see the description of SDET command).

The return value is unpredictable for any other value of item.

Example

GEW

Byte sequence: Microcontroller 1B AA AA

VoiceDSP 1B 00 02

Description: Get the VoiceDSP processor error word (typically sent after GSW when EV_ERROR is

reported in the status word).

The VoiceDSP processor responds: ERR_OPCODE:

GI 0

Byte sequence: Microcontroller 25 00 AA AA

VoiceDSP 25 00 00 06

Description: Get the duration of the last detected DTMF tone.

The VoiceDSP processor responds: 60 ms.

2-32

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

GL Get Length

Returns the length of the current message in multiples of 4 Kbytes (blocks).

The returned value includes the message directory information (64 bytes for the first block and 32bytes

for every other block), the message data, and the entire last block of the message, even if the mes-

sage occupies only a portion of the last block. Since a memory block includes 4096 bytes, the returned

length may be bigger than the actual message length by up to 4095 bytes. The minimum length of a

message is one block.

Example

GMS Get Memory Status

Returns the total remaining memory blocks as a 16bit unsigned integer. The estimated remaining re-

cording time may be calculated as follows:

Time = (Num_of_blocks x 4096 x 8) / ( Compression_rate x 1000)

This estimate assumes no silence compression: a real recording may be longer, according to the

amount of silence detected and compressed.

Example

GMT Get Message Tag

Returns the 16-bit tag associated with the current message. If the current message is undefined,

ERR_VALID is reported.

Byte sequence: Microcontroller 19 AA AA

VoiceDSP 19 00 04

Description: Get the length of the current message.

The VoiceDSP processor responds:

i.e., the message occupies 16384 (4 * 4096) bytes.

GMS

Byte sequence: Microcontroller 12 AA AA

VoiceDSP 12 00 28

Description: Return the remaining memory blocks.

The VoiceDSP responds:

40 blocks.

2-33

2—SOFTWARE ISD-T360SB

ISD

Example

GNM Get Number of Messages

tag_ref tag_mask

Returns the number of messages whose message tags match the

tag_ref

parameter. Only bits set in

tag_mask

are compared, a match is considered successful if:

message tag

and

tag_mask

tag_ref

and

tag_mask

where and is a bitwise AND operation.

The

tag_ref

and

tag_mask

parameters are each two bytes; the return value is also two bytes long.

See “Message Tag” on page 2-3 for a description of message-tag encoding. If

tag_mask

= 0, the total

number of all existing messages is returned, regardless of the

tag_ref

value.

Example

GSW Get Status Word

Returns the 2-byte status word.

STATUS WORD

The VoiceDSP processor has a 16-bit status word to indicate events that occur during normal opera-

tion. The VoiceDSP processor asserts the MWRQST signal (clears to 0), to indicate a change in the status

word. This signal remains active until the VoiceDSP processor receives a GSW command.

The status word is cleared during reset, and upon a successful GSW command.

GMT

Byte sequence: Microcontroller 04 AA AA

VoiceDSP 04 00 0E

Description: Get the current message tag.

In a system where the message tag is encoded as described in the DMS command, the

VoiceDSP processor return value indicates that the message is a new ICM in mailbox

Number 6.

GNM FFFE 0003

Byte sequence: Microcontroller 11 FF FE 00 03 AA AA

VoiceDSP 11 FF FE 00 03 00 05

Description: Get the number of messages which have bit 0 cleared, and bit 1 set, in their message

tags.

VoiceDSP processor responds that there are ﬁve messages which satisfy the request.

15 14 13 12 11 10 9 8 7 6 5 4 3 0

EV_

DTMF EV_

RESET EV_

VOX EV_

CONST_

NRG

Res EV_

MEMLOW EV_

DIALTONE EV_

BUSY EV_

ERROR EV_

MEMFULL EV_

NORMAL_

END

EV_

DTMF_

END

EV_

DTMF_

DIGIT

2-34

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

The bits in the status word are used as follows:

EV_DTMF_DIGIT

DTMF digit. A value indicating a detected DTMF digit. (See the description of DTMF code in the GT

command.)

EV_DTMF_END

1 = Ended detection of a DTMF tone. The detected digit is held in EV_DTMF_DIGIT.

EV_NORMAL_END

1 = Normal completion of operation, e.g., end of message playback.

EV_MEMFULL

1 = Memory is full.

EV_ERROR

1 = Error detected in the last command. You must issue the GEW command to return the error code

and clear the error condition.

EV_BUSY

1 = Busy tone detected. Use this indicator for call progress and line disconnection.

EV_DIALTONE

1 = Dial tone detected. Use this indicator for call progress and line disconnection.

EV_MEMLOW

1 = Not enough memory. (See CMSG command for further details.)

EV_CONST_NRG

1 = A period of constant energy was detected. Use this indicator for line disconnection. (See

CONST_NRG_TIME_COUNT in Table 2-8.)

EV_VOX

1 = A period of silence (no energy) was detected on the telephone line. Use this indicator for line dis-

connection. (See VOX_TIME_COUNT in Table 2-8.)

EV_RESET

When the VoiceDSP processor completes its power-up sequence and enters the RESET state, this bit is

set to 1, and the MWRQST signal is activated (cleared to 0). Normally, this bit changes to 0 after per-

forming the INIT command. If this bit is set during normal operation of the VoiceDSP processor, it indi-

cates an internal VoiceDSP processor error. The microcontroller can recover from such an error by re-

initializing the system.

EV_DTMF

1 = Started detection of a DTMF tone.

2-35

2—SOFTWARE ISD-T360SB

ISD

Example

GT Generate Tone

tone

Generates the tone specified by the 1-byte tone parameter. The VoiceDSP state changes to

TONE_GENERATE. The tone generation continues until an S command is received.

A DTMF or a single frequency tone may be generated as shown:

To generate a DTMF encode the bits as follows:

Bit 0

Bits 1–4

DTMF code.

Where the DTMF code is encoded as follows:

Value (Hex)DTMF Digit

0 to 90 to 9

Bits 5–7

To generate a single frequency tone encode the bits as follows:

Bit 0

Bits 1-5

3–30

The value in bits 1–5 is multiplied by 100 to generate the required frequency (300Hz–3000Hz).

GSW

Byte sequence: Microcontroller 14 AA AA

VoiceDSP 14 00 40

Description: Get the VoiceDSP processor Status Word (typically sent after the MMRQST signal is

asserted by the VoiceDSP processor which indicates a change in the status word).

The VoiceDSP processor responds that the memory is full.

2-36

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Bits 6-7

The VoiceDSP processor does not check for the validity of the tone specification. Invalid specification

yields unpredictable results.

Example

GTD Get Time and Day

time_day_option

Returns the time and day as a 2-byte value.

time_day_option

may be one of the following:

0 Get the system time and day.

1 Get the current message time-and-day stamp.

Any other

time_day_option

returns the time-and-day stamp of the current message.

Time and day are encoded as follows:

Bits 0–2

Day of the week (1 through 7).

Bits 3–7

Hour of the day (0 through 23).

Bits 8–13

Minute of the hour (0 through 59).

Bits 14–15

00 The time was not set before the current message was recorded.

11 The time was set, i.e., the SETD (Set Time of Day) command was executed.

NOTE If the current message is undefined, and time_day_option is 1, an ERR_INVALID error is reported.

GT 20

Byte sequence: Microcontroller 0D 20

VoiceDSP 0D 20

Description: Generate a single-frequency 1600Hz tone.

2-37

2—SOFTWARE ISD-T360SB

ISD

Example

GTM Get Tagged Message

tag_ref tag_mask dir

Selects the current message, according to instructions in

dir

, to be the first, nth next or nth previous mes-

sage which complies with the equation:

message tag

and

tag_mask

tag_ref

and

tag_mask

where and is a bitwise AND operation.

dir

is one of the following:

0 Selects the first (oldest) message.

-128 Selects the last (newest) message.

n Selects the nth next message starting from the current message.

–n Selects the nth previous message starting from the current message.

To select the nth message with a given tag to be the current message you must first select the first mes-

sage that complies with the above equation, and then issue another GTM command with n – 1 as a

parameter, to skip to the nth message.

NOTE To select the n

, or -n

, message with a given tag to be the current message you must first select

the first message (dir=0), or the last message (dir=-128), that complies with the above equation, and

then issue another GTM command with n-1 (for next message), or -n+1 (for previous message), as a

parameter, to skip to the n

, or -n

, message respectively.

\f a message is found, it becomes the current message and 1 (TRUE) is returned. If no message is

found, the current message remains unchanged and 0 (FALSE) is returned.

If dir is not 0, and the current message is undefined the return value is unpredictable. After the com-

mand execution the current message may either remain undefined or changed to any existing

message. The only exception is when the GTM command is executed just after the DM command.

(See the DM command for further details.)

To access the n

message, when n > 127, a sequence of GTM commands is required.

GTD 1

Byte sequence: Microcontroller 0E 01 AA AA

VoiceDSP 0E 01 E8 29

Description: Get the current message time-and-day stamp.

The VoiceDSP processor responds that the message was created on the ﬁrst day of the

week at 5:40 A.M. The return value also indicates that the SETD command was used to

set the system time and day before the message was recorded.

Note: If the SAS command is used to announce the time-and-day stamp, “Monday” is

announced as the ﬁrst day of the week. For an external vocabulary, the announcement

depends on the vocabulary deﬁnition (See the

IVS User’s Manual

for more details).

2-38

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Example

GTUNE Get Tune

index

Gets the value of the tunable parameter identified by

index

(one byte) as the 2-byte value,

parameter_value

. This command may be used to read and identify the parameter value that was set

to tune the VoiceDSP.

index

does not point to a valid tunable parameter, ERR_PARAM is set in the error word.

The GTUNE command may be used in IDLE state or RESET state. If TUNE command was not used to set

the tunable parameters, then the GTUNE command will read the default parameter value.

Tables 2-4 to 2-11 describe the tunable parameters, their index numbers and their

default values.

Example

GTM FFCE 003F 0

Byte sequence: Microcontroller 09 FF CE 00 3F 00 AA

VoiceDSP 09 FF CE 00 3F 00 01

Description: Select the oldest of the new ICMs, in mailbox number 6, to be the current message, for a

system where the message tag is encoded as described in the example for the DMS

command.

The VoiceDSP processor returns a value indicates that there is such a message.

The following pseudo-code demonstrates how to play all new ICMs in mailbox number

6. The messages are marked as old after being played:

Return_val = GTM(FFCE, 003F, 00) /*Get the oldest message with the deﬁned

tag*/

While (ReturnVal == TRUE)

Begin

P() /* Play */

Message_tag = GMT() /* Get message tag */

SMT(FFF7) /* Mark the message as ‘old’ */

GTM(FFCE, 003F, 01) /* Get next message with the same tag */

End

GTUNE 17

Byte sequence: Microcontroller 06 17 AA AA

VoiceDSP 06 17 02 BC

Description: Get the minimum period for busy detection

ComactSPEECH responds:

700 (7 seconds).

2-39

2—SOFTWARE ISD-T360SB

ISD

INIT Initialize System

Execute this command after the VoiceDSP processor has been configured (see CFG command). INIT

performs a soft reset of the VoiceDSP as follows:

• Initializes the message directory information.

• Messages are not deleted. To delete the messages, use the DM and DMS commands.

• Sets the detectors mask to 0.

• Sets the volume level that is controlled by the VC command, to 0.

• Sets the playback speed to normal (0).

• Switches to the IDLE state.

• Initializes the tone detectors.

The current message is undefined after INIT execution.

The tunable parameters are not affected by this command. They are set to their default values only

during RESET.

Example

INJ Inject IVS Data

n byte

. . . byte

Injects vocabulary data of size

bytes to good Flash blocks.

This command programs Flash devices, on a production line, with IVS vocabulary data. It is optimized

for speed; all VoiceDSP processor detectors are suspended during execution of the command. Use

the CVOC command to check whether programming was successful.

If there is not enough memory space for the vocabulary data, ERR_PARAM is set in the error word, and

execution stops.

Flash blocks that include IVS data can not be used for recording, even if only one byte of the block

contains IVS data (e.g., if the vocabulary size is 4K + 100 bytes, two blocks of the Flash are not available

for message recording).

Example

INIT

Byte sequence: Microcontroller 13

VoiceDSP 13

Description: Initialize the VoiceDSP processor.

INJ 00000080

Data

Byte sequence: Microcontroller 29 00 00 00 80 Vocabulary Data

VoiceDSP 29 00 00 00 80 Echo of Data

Description: Inject 128 bytes of vocabulary data.

2-40

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

MR Memory Reset

Erases all memory blocks and initializes the VoiceDSP processor (does exactly what the INIT command

does). Bad blocks, and blocks which are used for IVS vocabularies, are not erased. This command can

be issued in either RESET or IDLE states.

NOTE When Memory Reset is used in RESET state, it must be issued after the CFG command is issued, or the

memory type and number of devices are not defined. In this case the result is unpredictable.

NOTE The command erases all messages and should be used with care.

Example

P Playback

Begins playback of the current message. The VoiceDSP processor state changes to PLAY. When play-

back is complete, the VoiceDSP processor sets the EV_NORMAL_END bit in the status word, and acti-

vates (clears to 0) the MWRQST signal. The state then changes to IDLE. Playback can be paused with

the PA command, and can be resumed later with the RES command. Playback can be stopped with

the S command.

If the current message is undefined, ERR_INVALID is reported.

Example

PA Pause

Suspends the execution of the current GT, P, R, SAS, SO, SW, or SS command. The PA command does

not change the state of the VoiceDSP processor; execution can be resumed with the RES command.

NOTE DTMF and tone detectors remain active during Pause.

Byte sequence: Microcontroller 2A

VoiceDSP 2A

Description: Erase all memory blocks.

Byte sequence: Microcontroller 03

VoiceDSP 03

Description: Play the current message.

2-41

2—SOFTWARE ISD-T360SB

ISD

Example

PDM Go To Power-Down Mode

Switches the VoiceDSP processor to power-down mode (see “POWER-DOWN MODE” on page 1-4 for

details). Sending any command while in power-down mode resets the processor detectors, and re-

turns it to normal operation mode.

NOTE If an event report is pending (MWRQST is active) and not processed by the microcontroller prior to

issuing the PDM command, the event is lost.

Example

R Record

tag compression_rate

Records a new message with message tag

tag

and compression rate

compression_rate

. The VoiceD-

SP processor state changes to RECORD. The R command continues execution until stopped by the S

command. Recording can be paused with the PA command, and can be resumed later with the RES

command.

If the memory becomes full, recording stops and EV_MEMFULL is set in the status word.

See “Message Tag” on page 2-3 for a description of message-tag encoding.

The compression rate may be defined as 0 for PCM recording or either 1, 3, 6 for compression rates 5.3

Kbits/sec, 9.9 Kbits/sec, 16.8 Kbits/sec respectively. See “ VCD” on page 2-10 for a description of the

compression algorithm.

NOTE A time-and-day stamp is automatically attached to each message. Before using the R command

for the first time, use the SETD command. Failure to do so results in undefined values for the time-and-

day stamp.

Example of a typical recording session:

• (ICM) The microcontroller detects the first ring.

• (ICM, OGM, memo) The microcontroller sends the R command.

Byte sequence: Microcontroller 1C

VoiceDSP 1C

Description: Suspend playback of current message.

PDM

Byte sequence: Microcontroller 1A

VoiceDSP 1A

Description: Put the VoiceDSP processor in power-down mode.

2-42

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Example

RDET Reset Detectors

detectors_reset_mask

Resets the VoiceDSP processor tone and energy detectors according to the value of the

detectors_reset_mask parameter. A bit set to 1 in the mask, resets the corresponding detector. A bit

cleared to 0 is ignored.

The 1-byte

detectors_reset_mask

is encoded as follows:

Bit 0

Reset the busy and dial tone detectors.

Bits 1–3

Reserved. Must be cleared to 0.

Bit 4

Reset the constant energy detector.

Bit 5

Reset the no energy (VOX) detector.

Bit 6

Reset the DTMF detector.

Bit 7

Reserved. Must be cleared to 0.

Example

R 000E 03

Byte sequence: Microcontroller 0C 00 0E 03

VoiceDSP 0C 00 0E 03

Description: Record a new ICM in mailbox Number 6 in a system where the message tag is encoded

as described in the example of the DMS command. The compression rate is deﬁned as

9.9 Kbits/sec.

RDET 20

Byte sequence: Microcontroller 2C 20

VoiceDSP 2C 20

Description: Reset the VOX detector.

2-43

2—SOFTWARE ISD-T360SB

ISD

RES Resume

Resumes the activity that was suspended by the PA, SB, or SF commands.

Example

RMSG Read Message

Returns 32 bytes of data from the current position of the message pointer, and advances the message

pointer by 32 bytes.

If the VoiceDSP processor was in the IDLE state, the command opens the current message, switches

the VoiceDSP processor to the MSG_OPEN state, sets the message pointer to the beginning of the mes-

sage data, and returns the 32 bytes of data.

The microcontroller must issue an S command to close the message, and switch the VoiceDSP proces-

sor to the IDLE state.

If the current message is undefined, ERR_INVALID is reported.

Trying to read beyond the end of the message sets the EV_NORMAL_END event, and the VoiceDSP

processor switches to the IDLE state. In this case, the return value is undefined and should be ignored.

Example

S Stop

Stops execution of the current command and switches the VoiceDSP processor to the IDLE state. S

may be used to stop the execution of CMSG, SMSG, WMSG, RMSG and all asynchronous commands.

Example

RES

Byte sequence: Microcontroller 1D

VoiceDSP 1D

Description: Resume playback which was suspended by either the PA, SF or SB command.

RMSG

Byte sequence: Microcontroller 32 AA AA ...

VoiceDSP 32 32 bytes of data

Description: Read 32 bytes from the current message memory.

Byte sequence: Microcontroller 00

VoiceDSP 00

Description: Stop current activity (e.g., playback, recording) and change the VoiceDSP processor

to IDLE state.

2-44

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

SAS Say Argumented Sentence

sentence_n arg

Announces sentence number

sentence_n

of the currently selected vocabulary, and passes

arg

sentence_n

and

arg

are each 1-byte long. The VoiceDSP processor state changes to SYNTHESIS.

When playing is complete, the VoiceDSP processor sets the EV_NORMAL_END bit in the status word,

and activates the MWRQST signal. The state then changes to IDLE.

If the current vocabulary is undefined, ERR_INVALID is reported.

Example

SB Skip Backward

time_length

Skips backward in the current message time_length units, in 0.2 second segments, and pauses mes-

sage playback. The RES command must be issue to continue playback.

time_length

is a 2-byte pa-

rameter that can have any value up to 320 (64 seconds). The skip accuracy is five percent. SB is

meaningful only in the PLAY state.

If the beginning of the message is detected during the execution of the SB command, execution ter-

minates, the EV_NORMAL_END bit in the status register sets, the MWRQST signal activates, and the pro-

cessor switches to the IDLE state.

time_length

is greater than 320, ERR_PARAM is set in the error word.

Playback speed does not affect the behavior of this command.

Example

SDET Set Detectors Mask

detectors_mask

Controls the reporting of detection of tones and energy detectors according to the value of the

detectors_mask

parameter. A bit set to 1 in the mask, enables the reporting of the corresponding de-

tector. A bit cleared to 0 disables the reporting.

Disabling reporting of a detector does not stop or reset the detector.

The 1-byte

detectors_mask

is encoded as follows:

SAS 00 03

Byte sequence: Microcontroller 1E 00 03

VoiceDSP 1E 00 03

Description: Announce the ﬁrst sentence in the sentence table of the currently selected vocabulary

with ‘3’ as the actual parameter.

SB 0019

Byte sequence: Microcontroller 23 00 19

VoiceDSP 23 00 19

Description: Skip backwards ﬁve seconds from the current position in the message being played.

2-45

2—SOFTWARE ISD-T360SB

ISD

Bit 0

Report detection of a busy tone.

Bit 1

Report detection of a dial tone.

Bit 2-3

Reserved. Must be cleared to 0.

Bit 4

Report detection of a constant energy.

Bit 5

Report detection of no energy (VOX) on the line.

Bit 6

Report the ending of a detected DTMF.

Bit 7

Report the start of a detected DTMF (up to 40 ms after detection start).

Example

SE Skip to End of Message

This command is valid only in the PLAY state. When invoked, playback is suspended (as for the PA com-

mand), and a jump to the end of the message is performed. Playback remains suspended after the

jump.

Example

SDET A3

Byte sequence: Microcontroller 10 B3

VoiceDSP 10 B3

Description: Set reporting of all VoiceDSP processor detectors, except for end-of-DTMF.

Byte sequence: Microcontroller 24

VoiceDSP 24

Description: Skip to end of current message.

2-46

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

SETD Set Time and Day

time_and_day

Sets the system time and day as specified by the 2-bytes

time_and_day

parameter. The

time_and_day

parameter is encoded as follows:

Bits 0–2

Day of the week (1 through 7).

Bits 3–7

Hour of the day (0 through 23).

Bits 8–13

Minute of the hour (0 through 59).

Bits 14–15

Must be set to 1.

time_and_day

value is not valid, ERR_PARAM is set in the error word.

Example

SF Skip Forward

time_length

Skips forward in the current message

time_length

units, in 0.2 second segments, and causes message

playback to pause. The RES command must be issue to continue playback.

time_length

is a 2-byte

parameter that can have any value up to 320 (64 seconds). The skip accuracy is five percent. This

command is meaningful only in the PLAY state. The RES command must be issue to continue playback.

If the end of the message is detected during execution of SF, execution of the command is terminated

the EV_NORMAL_END bit in the status word is set, the MWRQST signal is activated and the processor

switches to the IDLE state.

If time_length is greater than 320, ERR_PARAM is set in the error word.

Playback speed does not affect the behavior of this command.

Example

SETD DE09

Byte sequence: Microcontroller 0F DE 09

VoiceDSP 0F DE 09

Description: Set time and day to Monday 1.30 A.M. (where Monday is the ﬁrst day of the week)

SF 0019

Byte sequence: Microcontroller 22 00 19

VoiceDSP 22 00 19

Description: Skip forward ﬁve seconds from the current position in the message being played.

2-47

2—SOFTWARE ISD-T360SB

ISD

SMSG Set Message Pointer

num_of_pages

Sets the message pointer to

num_of_pages

x 32 bytes from the beginning of the current message da-

ta.

If the VoiceDSP processor was in the IDLE state, the command opens the current message and switch-

es the VoiceDSP processor to the MSG_OPEN state. The microcontroller must issue an S command to

close the message, and switch the VoiceDSP processor to the IDLE state.

num_of_pages

x 32 is greater than the message length, EV_NORMAL_END is set in the status word,

the message pointer is set to the end of the message, and the VoiceDSP processor switches to the IDLE

state.

If the current message is undefined, ERR_INVALID is reported.

Example

SMT Set Message Tag

message_tag

Sets the tag of the current message. The 2-byte

message_tag

can be used to implement mailbox

functions by including the mailbox number in the tag, or to handle old and new messages differently

by using one bit in the tag to mark the message as old or new. See “Message Tag” on page 2-3.

To change the message tag, you should first get the tag using the GMT command, read the tag, mod-

ify it, and write it back.

NOTE Message tag bits can only be cleared. Message tag bits are set only when a message is first created.

If the current message is undefined, ERR_INVALID is reported.

Example

SMSG 000A

Byte sequence: Microcontroller 30 00 0A

VoiceDSP 30 00 0A

Description: Set the message pointer to 10 pages (320 bytes) from the beginning of the current

message data.

SMT FFF7

Byte sequence: Microcontroller 05 FF F7

VoiceDSP 05 FF F7

Description: Mark the current message as old in a system where the message tag is encoded as

described in the example of the DMS command.

Note that the VoiceDSP processor ignores bits in the tag which are set to 1; only bit 3 is

modiﬁed in the message tag.

2-48

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

SO Say One Word

word_number

Plays the word number

word_number

in the current vocabulary. The 1-byte

word_number

may be any

value from 0 through the index of the last word in the vocabulary. The VoiceDSP processor state

changes to SYNTHESIS.

When playback of the selected word has been completed, the VoiceDSP processor sets the

EV_NORMAL_END bit in the status word, and activates the MWRQST signal. The state then changes to

IDLE.

word_number

is not defined in the current vocabulary, or if it is an IVS control or option code,

ERR_PARAM is set in the error word.

If the current vocabulary is undefined, ERR_INVALID is reported.

Example

SPS Set Playback Speed

speed

Sets the speed of message playback as specified by speed. The new speed applies to all recorded

messages and synthesized messages (only if synthesized using IVS), until changed by another SPS com-

mand. If this command is issued while the VoiceDSP processor is in the PLAY state, the speed also

changes for the message currently being played.

Speed may be one of 13 values, from –6 to +6. A value of 0 represents normal speed.

NOTE A negative speed value represents an increase in speed, a positive value represents a decrease in

speed.

NOTE The playback speed control is not applicable when the stored messages or the IVS data are not

compressed (Stored in PCM format).

The change in speed is approximate, and depends on the recorded data. In any case, if i < j, play-

back speed with parameter i is the same or faster than with parameter j.

speed

is not in the –6 to +6 range, ERR_PARAM is set in the error word.

Example

SO 00

Byte sequence: Microcontroller 07 00

VoiceDSP 07 00

Description: Announce the ﬁrst word in the word table of the currently selected vocabulary.

SPS FB

Byte sequence: Microcontroller 16 FB

VoiceDSP 16 FB

Description: Set playback speed to –5.

2-49

2—SOFTWARE ISD-T360SB

ISD

SS Say Sentence

sentence_n

Say sentence number

sentence_n

of the currently selected vocabulary.

sentence_n

is 1-byte long.

The VoiceDSP processor state changes to SYNTHESIS.

If the sentence has an argument, 0 is passed as the value for this argument.

When playing has been completed, the VoiceDSP processor sets the EV_NORMAL_END bit in the status

word, and activates the MWRQST signal. The state then changes to IDLE.

sentence_n

is not defined in the current vocabulary, ERR_PARAM is set in the error word.

If the current vocabulary is undefined, ERR_INVALID is reported.

Example

SSM Set Speakerphone Mode

mode

Sets the speakerphone to the

mode

mode of operation. The command is valid when the VoiceDSP

processor is in IDLE state.

mode

can be one of:

0 OFF Deactivate the speakerphone, and return the VoiceDSP processor to

normal operation mode.

1 ON Put the VoiceDSP processor in speakerphone mode and activate speak-

erphone in full-duplex mode i.e., with full cancellation of both the acous-

tic and the electrical echoes. Tone detectors are not active. Gains in the

Send and Receive paths are set by the relevant tunable parameters.

2 TRANSPARENT Activate the speakerphone with no echo cancellation (this mode is used

for system tuning).

3 MUTE Activate the speakerphone, while generating silence to the line. The

near-end-listener can hear the far-end-speaker, but not vice versa. Tone

detectors are not active.

4 LISTEN The line is audible on the speaker. Tone detectors are active. This mode

is used for call generation.

5 Reserved.

6 RESTART Restart the current speakerphone mode. This mode differs from ON; it

does not require full initialization of the speakerphone. It should be used

to resume the speakerphone operation after HOLD mode or to adjust to

an environment change (e.g., parallel pickup).

7 HOLD Stop the codec interrupts. Neither side can hear each other.

See “Full-duplex Speakerphone” on page 2-14 for more details.

SS 00

Byte sequence: Microcontroller 1F 00

VoiceDSP 1F 00

Description: Announce the ﬁrst sentence in the sentence table of the currently selected

vocabulary.

2-50

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

NOTE Only commands that are specified in Table 2-3, are active during all speakerphone modes (other

than 0).

Example

SV Set Vocabulary Type

type id

Selects the vocabulary table to be used for voice synthesis. The vocabulary type is set according to

the 1-byte

type

parameter:

0 For compatibility only.

1 External vocabulary in ROM.

2 External vocabulary in Flash.

3-7 Reserved.

The host is responsible for selecting the current vocabulary, with SV command, before using an SAS,

SO, SS or SW command. Each external vocabulary table has a unique id which is part of the vocabu-

lary internal header (See the

IVS User’s Guide

for more details). If type is 1 or 2, the VoiceDSP processor

searches for the one byte

parameter in each vocabulary table header until a match is found.

If the

parameter does not point to a valid IVS vocabulary, ERR_PARAM is set in the error word.

Example

SW Say Words

n word

. . . word

Plays n words, indexed by

word1

wordn

. The VoiceDSP processor state changes to SYNTHESIS.

On completion, the EV_NORMAL_END bit in the status word is set, and the MWRQST signal goes low.

The state then changes to IDLE.

If one of the words is not defined in the current vocabulary, or if it is an IVS control or option code, or

if n > 8, ERR_PARAM is reported.

SSM 01

Byte sequence: Microcontroller 2F 01

VoiceDSP 2F 01

Description: Put the VoiceDSP processor into Speakerphone mode, and set the speakerphone to full-duplex mode.

SV 02 03

Byte sequence: Microcontroller 20 02 03

VoiceDSP 20 02 03

Description: Select the vocabulary with vocabulary-id 3, which resides on a Flash, as the current

vocabulary.

2-51

2—SOFTWARE ISD-T360SB

ISD

If the current vocabulary is undefined, ERR_INVALID is reported.

Example

TUNE Tune

index parameter_value

Sets the value of the tunable parameter identified by

index

(one byte) to the 2-byte value,

parameter_value

. This command may be used to tune the DSP algorithms to a specific Data Access

Arrangement (DAA) interface, or to change other parameters. If you do not use TUNE, the VoiceDSP

processor uses default values.

index

does not point to a valid tunable parameter, ERR_PARAM is set in the error word.

NOTE The tunable parameters are assigned with their default values on application of power. The INIT

command does not affect these parameters.

The following tables 2-4 to 2-11 describe the tunable parameters, their index numbers and their default

values, grouped by their functionality.

SW 02 00 00

Byte sequence: Microcontroller 21 02 00 00

VoiceDSP 21 02 00 00

Description: Announce the ﬁrst word, in the word table of the currently selected vocabulary, twice.

Table 2-4: TUNABLE PARAMETERS: Voice Compression and Decompression (VCD)

Index Parameter Name Description Default

4 Voice Activity

Detection (VAD):

VAD_SIL_THRESHOLD

Prevents speech from being interpreted as silence. The silence

detection algorithm has an adaptive threshold, which is

changed according to the noise level. This parameter is,

therefore, only the initial threshold level.

Legal values: 9216 to 13824 in 512 (6 dB) steps.

11264

5 Voice Activity

Detection (VAD):

VAD_SIL_THRESHOLD_ST

Deﬁnes the adaptive threshold changes step.

If this threshold is too low, the threshold converges too slowly. If

it is too high, silence detection is too sensitive to any noise.

Legal values: 3 to 48.

6 Voice Activity

Detection (VAD):

VAD_SIL_BURST_THRESH

OLD

The minimum time period for speech detection, during

silence. As this threshold increases, the time period

interpreted as silence increases.

If this threshold is too low, a burst of noise is detected as

speech. If it is too high, words may be partially cut off.

Legal values: 1 to 3.

2-52

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

7 Voice Activity

Detection (VAD):

VAD_SIL_HANG_THRESH

OLD

The minimum time period for silence detection, during

speech. As this threshold increases, the time period

interpreted as silence decreases.

If this threshold is too low, words may be partially cut off. If it is

too high, no silence is detected.

Legal values: 8 to 31.

8 Voice Activity

Detection (VAD):

VAD_SIL_ENABLE

Silence compression control.

0 turns silence compression off.

Note: Silence compression must be turned off when using

ARAM for voice storage. Otherwise the playback quality is

unpredictable.

9 Voice Activity

Detection (VAD):

VAD_ENERGY_FACTOR

Determines the energy level used to synthesize silence. For the

default value, the energy levels of the synthesized silence and

the recorded silence are the same.

If you divide (multiply) the default value by two, the

synthesized silence is 6 dB less (more) than the level of the

recorded silence.

Legal values: 1024 to 16384.

8192

70 SW Automatic Gain

Control (SW AGC):

SWAGC_ENABLE

SW AGC control.

0 turns SW AGC off.

11 SW Automatic Gain

Control (SW AGC):

SWAGC_FACTOR

Determines the maximum gain that the SW AGC algorithm

may use.

Legal values: 0, 1, 2, 4, 8, 16, 32, 64, 128

Note: Value 0 means the the maximum gain is deﬁned by the

algorithm.

128

Table 2-4: TUNABLE PARAMETERS: Voice Compression and Decompression (VCD)

Index Parameter Name Description Default

2-53

2—SOFTWARE ISD-T360SB

ISD

Table 2-5: TUNABLE PARAMETERS: Tone Generation and Message Playback

Index Parameter Name Description Default

27 DTMF Generation:

DTMF_GEN_TWIST_LEVEL

A one-byte value that controls the twist level of a DTMF tone,

generated by the GT command, by controlling the energy

level of each of the two tones (low frequency and high

frequency) composing the DTMF tone. The Least Signiﬁcant

Nibble (LSN) controls the low tone and the Most Signiﬁcant

Nibble (MSN) controls the high tone. The energy level of each

tone, as measured at the output of a TP3054 codec (before

the DAA) connected to the VoiceDSP processor is summarized

in the following table:

Nibble Value Tone Energy (dB-Volts)

0 0

1 –17.8

2 –14.3

3 –12.9

4 –12.4

5 –12.0

6 –11.9

7 –11.85

8..15 –11.85

The volume of the generated DTMF tone during

measurements was 6. (TONE_GEN_LEVEL+VOL_LEVEL = 6).

For the default level, the high tone is –14.3 dBV and the low

tone is –12.4 dBV, which gives a DTMF twist level of 1.9 dB.

The energy level of a single generated tone is the level of the

low tone.

16 Tone Generation:

TONE_GEN_LEVEL

Controls the energy level at which DTMF and other tones are

generated. Each unit represents 3 dB. The default level is the

reference level.

For example, if you set this parameter to 4, the energy level is

6 dB less than the default level. The actual output level is the

sum of TONE_GEN_LEVEL and the VOL_LEVEL variable,

controlled by the VC command. The tones are distorted when

the level is set too high.

Legal values: 0

≤

TONE_GEN_LEVEL + VOL_LEVEL

≤

12.

21 VCD Playback and

Voice Synthesis:

VCD_PLAY_LEVEL

Controls the energy during playback and external voice

synthesis. Each unit represents 3 dB. The default level is the

reference level.

For example, if you set this parameter to 4, the energy level is

6 dB less than the default level. The actual output level is the

sum of VCD_LEVEL and the VOL_LEVEL variable, controlled by

the VC command. Speech is distorted when the level is set

too high.

Legal values: 0

≤

VCD_PLAY_LEVEL + VOL_LEVEL

≤

12.

2-54

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Table 2-6: TUNABLE PARAMETERS: DTMF Detection

Index Parameter Name Description Default

17 Energy Level:

DTMF_DET_MIN_ENERG

Minimum energy level at which DTMF tones are detected. If

you divide (multiply) the value by 2, the detection sensitivity

decreases (increases) by 3 dB.

Legal values: 8 to 4096

24 Echo Canceler:

DTMF_DET_ECHO_DELA

The near-echo delay in samples. The sampling rate is 8000Hz

(i.e., 125 ms per sample).

Legal values: 0 to 16.

26 Twist Level:

DTMF_DET_REV_TWIST

Controls the reverse twist level at which the VoiceDSP

processor detects DTMF tones. While the normal twist is set at 8

dB, the reverse twist can be either 4 dB (default) or 8 dB (if this

parameter is set to 1).

60 SW AGC:

DTMF_DET_AGC_IDLE

SW AGC for DTMF in idle/record modes. When incrementing

the tunable by 1, the dynamic range is increased by 3 dB.

Legal values: 0 to 5.

61 SW AGC:

DTMF_DET_AGC_PLAY

Software AGC for play mode and tone generation modes.

When incrementing the tunable by 1, the dynamic range

increases by 3 dB.

Legal values: 0 to 16.

2-55

2—SOFTWARE ISD-T360SB

ISD

Table 2-7: TUNABLE PARAMETERS: Tone Detection

Index Parameter Name Description Default

18 Dial Tone:

TONE_DET_TIME_COUNT

Controls the duration of a tone before it is reported as a dial

tone, in 10 msec units. The accuracy of the constant is ±10 ms.

Legal values: 0 to 65535.

700

19 Busy and Dial Tone:

TONE_DET_ON_ENERGY

THRESHOLD

Minimum energy level at which busy and dial tones are

detected as ON (after 700Hz ﬁltering). If you divide (multiply)

the value by 2 you get about 3 dB decrease (increase) in the

threshold.

The mapping between energy level and the parameter value

is as follows (measured on the codec output when a 400Hz

tone was injected to the codec input):

Tunable value Energy threshold (dB-Volts)

10 –31.8

20 –28.6

100 –21.7

500 –14.7

8000 –2.5

Legal values: 0 to 65535.

160

20 Busy and Dial Tone:

TONE_DET_OFF_ENERGY

THRESHOLD

Maximum energy level at which busy and dial tones are

detected as OFF (after 700Hz ﬁltering). If you divide (multiply)

the value by 2 you get about 3 dB decrease (increase) in the

threshold.

The mapping between energy level and the parameter value

is the same as for TONE_ON_ENERGY_THRESHOLD

Legal values: 0 to 65535.

110

23 Busy Tone:

BUSY_DET_MIN_TIME

Minimum time period for busy detection, in 10 ms units. The

accuracy of the constant is ±10 ms.

Legal values: 0 to 65535.

600

53 Busy Tone:

BUSY_DET_MIN_ON_TIM

Minimum period considered as On period for busy tone

detection. Note that for weak signals:

(–30 dB and below) the maximum value is 12 (i.e., 120 ms

minimum detection time).

Unit: 10 ms. Accuracy is ±20 ms.

Legal values: 10 to 1000.

54 Busy Tone:

BUSY_DET_MAX_ON_TIM

Maximum period considered as On for busy-tone detection.

Unit: 10 ms. Accuracy is ±20 ms.

Legal values: 10 to 1000.

168

2-56

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

55 Busy Tone:

BUSY_DET_MIN_OFF_TIM

Minimum period considered as Off for busy-tone detection.

Unit: 10 ms. Accuracy is ±20 ms.

Legal values: 5 to 1000.

56 Busy Tone:

BUSY_DET_MAX_OFF_TI

Maximum period considered as On for busy-tone detection.

Unit: 10 ms. Accuracy is ±20 ms.

Legal values: 5 to 1000.

122

57 Busy Tone:

BUSY_DET_VERIFY_COU

Number of On/Off cadences that must be detected prior to

reporting busy-tone presence.

Legal values: 9 to 127.

58 Busy Tone:

BUSY_DET_TONE_TYPE

Speciﬁes the type of busy tone to detect:

1 —Two cadences

2 —Three cadences

3 —Both two and three cadences

59 Busy Tone:

BUSY_DET_DIFF_THRESH

OLD

The maximum allowed difference between two compared

On or Off periods. Unit: 10 ms.

Legal values: 0 to 1000.

Table 2-7: TUNABLE PARAMETERS: Tone Detection

Index Parameter Name Description Default

2-57

2—SOFTWARE ISD-T360SB

ISD

Table 2-8: TUNABLE PARAMETERS: Energy Detection

Index Parameter Name Description Default

10 Silence (VOX):

VOX_DET_ENERGY_THRE

SHOLD

This parameter determines the minimum energy level at

which voice is detected. Below this level, it is interpreted as

silence.

Legal values: 1 to 32767.

12 Silence (VOX):

VOX_DET_TIME_COUNT

This parameter, in units of 10 ms, determines the period of

silence before the VoiceDSP processor reports silence. The

accuracy of the constant is ±10 ms.

Legal values: 0 to 65535.

700

22 Silence (VOX):

VOX_DET_TOLERANCE_T

IME

Controls the maximum energy-period, in 10 ms units, that does

NOT reset the vox detector.

Legal values: 0 to 255.

47 Constant Energy:

CONST_NRG_DET_TIME_

COUNT

Minimum elapsed time until the VoiceDSP processor reports

constant energy level. Units: 10 ms. Accuracy: ±10 ms

Legal values: 1 to 65534

700

48 Constant Energy:

CONST_NRG_DET_

TOLERANCE_TIME

Variations in constant energy, up to this time, do not reset the

constant energy detector. Units: 10 ms.

Legal values: 0 to 255

49 Constant Energy:

CONST_NRG_DET_LOW

THRESHOLD

Determines the minimum energy level that is treated as

constant energy. The minimum energy is calculated as follows:

(1—1/2CONST_NRG_DET_LOW_THRESHOLD) * average_energy

Legal values: 1 to 16

50 Constant Energy:

CONST_NRG_DET_HIGH

THRESHOLD

Determines the maximum energy level that is treated as

constant energy. The maximum energy is calculated as

follows:

(1 + 1/2CONST_NRG_DET_HIGH_THRESHOLD) * average_energy

Legal values: 0 to 16

2-58

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Table 2-9: TUNABLE PARAMETERS: Speakerphone

Index Parameter Name Description Default

31 Acoustic Echo

Canceler (AEC):

SP_AEC_PRIORITY_BIAS

Controls the bias in priority between the Send and Receive

paths.

If send priority-bias is preferred, the value should be greater

than zero.

For no priority bias, the value should be zero.

For priority bias for the Receive path, the value should be

negative.

Steps are 3 dB each (e.g., +3 is 9 dB bias for the Send path, –2

is 6 dB bias for the Receive path).

Legal values: –4 to 4.

32 Acoustic Echo

Canceler (AEC):

SP_AEC_COUPLING_

LOSS_THRESHOLD

This parameter limits the acoustic return loss. Its value

(SP_AEC_COUPLING_LOSS_THRESHOLD / 32767) is compared

with the RMS value of Sout divided by the RMS value of Rin,

during a single-talk event. The loop gain is decreased, if

necessary, to control the TCL level.

For SP_AEC_COUPLING_LOSS_THRESHOLD = 32767 this loop is

disabled.

Legal values: 0 to 32767.

2047

34 Acoustic Echo

Canceler (AEC):

SP_AEC_LR_LEVEL

Controls the speakerphone gain from the microphone to the

line-out. The total attenuation, or gain, depends on both of

the analog gains and this value. The gain is:

K * signal

where:

K = SP_AEC_LR_LEVEL/4096.

Legal values: 0 to 16000.

14000

36 Acoustic Echo

Canceler (AEC):

SP_AEC_CLIP_POS

Speciﬁes the positive peak-value at which the analog circuit

of the line-out saturates. Codec analog full scale corresponds

to µLAW full scale values after expansion.Assume that positive

saturation occurs at amplitudes higher than those of a sine

wave at X [dBm0]. The SP_AEC_CLIP_POS value is set as:

SP_AEC_CLIP_POS = 32636 * 10((X – 3.17)/20)

Note: a sine wave with amplitude 4 * 8159 = 32636

corresponds to 3.17 dBm0.

Example:

For X = –6.2761 dBm0, the value is:

SP_AEC_CLIP_POS = 32636 * 10((–6.2761– 3.17)/20) = 0.3371 *

32636 =11000;

Legal values: 0 to 32767.

16000

37 Acoustic Echo

Canceler (AEC):

SP_AEC_CLIP_NEG

Speciﬁes the negative peak value at which the analog circuit

of the line-out saturates. Codec analog full scale corresponds

to µLAW full scale values after expansion.The value of

SP_AEC_CLIP_NEG is set as shown for SP_AEC_CLIP_POS,

above.

Legal values: –32768 to 0.

–16000

2-59

2—SOFTWARE ISD-T360SB

ISD

40 Acoustic Echo

Canceler (AEC):

SP_AEC_ENABLE

Enables/disables the acoustic echo controller.

Legal values: 0 (disable), 1 (enable).

43 Acoustic Echo

Canceler (AEC):

SP_AEC_VOX_HYST

Controls the hysteresis in near-talker detection. (The

speakerphone state machine has a built-in hysteresis

mechanism to prevent ﬂuctuations in the talker identiﬁcation

process i.e., identifying the active side.) The value of this

parameter is a dimensionless number, which should be

evaluated during the tuning process for speciﬁc hardware.

Larger values for the parameter correspond to a wider

hysteresis loop. Negative values increase the probability that

the state machine remains in the last state.

Legal values: –127 to 127.

45 Acoustic Echo

Canceler (AEC):

SP_AEC_DTD_TH

Controls the sensitivity of the system. Low values correspond to

high sensitivity, with a greater false alarm probability (i.e., an

echo is considered a real talker).

High values correspond to low sensitivity, with slower switching.

This parameter is affected by the loop gain and the speciﬁc

hardware characteristics.

Legal values: 0 to 127.

35 Electric Echo Canceler

(EEC):

SP_EEC_LR_LEVEL

Controls the speakerphone gain from the line-in to the

speaker. The total attenuation, or gain, depends on both of

the analog gains and this value. The gain is:

K * signal

where:

K = (SP_EEC_LR_LEVEL/4096) * (2(6 + VOL_LEVEL)/2)

Legal values: 0 to 400.

281

Table 2-9: TUNABLE PARAMETERS: Speakerphone

Index Parameter Name Description Default

2-60

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

38 Electric Echo Canceler

(EEC):

SP_EEC_CLIP_POS

Speciﬁes the positive peak value at which the analog circuit

of the speaker saturates. Codec analog full scale

corresponds to µLAW full scale values after expansion. The

value of SP_EEC_CLIP_POS is set as shown for

SP_AEC_CLIP_POS, above.

Legal values: 0 to 32767.

16000

39 Electric Echo Canceler

(EEC):

SP_EEC_CLIP_NEG

Speciﬁes the negative peak value at which the analog circuit

of the line-out saturates. Codec analog full scale corresponds

to µLAW full scale values after expansion. The value of

SP_EEC_CLIP_NEG is set as shown for SP_AEC_CLIP_POS,

above.

Legal values: –32768 to 0.

–16000

41 Electric Echo Canceler

(EEC):

SP_EEC_ENABLE

Enables/disables the electrical echo controller.

Legal values: 0 (disable), 1 (enable).

44 Electric Echo Canceler

(EEC):

SP_EEC_VOX_HYST

Controls the hysteresis in far-talker detection. (The

speakerphone state machine has a built-in hysteresis

mechanism to prevent ﬂuctuations in the talker identiﬁcation

process i.e., identifying the active side.) The value of this

parameter is a dimensionless number, which should be

evaluated during the tuning process for speciﬁc hardware.

Larger values for the parameter correspond to a wider

hysteresis loop. Negative values increase the probability that

the state machine remains in the last state.

Legal values: –127 to 127.

46 Electric Echo Canceler

(EEC):

SP_EEC_DTD_TH

Controls the sensitivity of the system. Low values correspond to

high sensitivity, with a greater false alarm probability (i.e., an

echo is considered a real talker).

High values correspond to low sensitivity, with slower switching.

This parameter is affected by the loop gain and the speciﬁc

hardware characteristics.

Legal values: 0 to 127.

33 Attenuation:

SP_BLOCK_LEVEL

Controls the maximum attenuation level of the speakerphone

suppressors. It affects the speakerphone stability and its

subjective quality. The maximum attenuation is calculated

according to:

SP_BLOCK_LEVEL/228

Legal values: 550 to 32000.

10922

42 Tone Generation:

SP_TONE_GEN_

LEVEL

Controls the energy level at which DTMF, and other tones, are

generated to the line (codec 0) while the speakerphone is

active. Each unit represents 3 dB.

Legal values: 0

≤

SP_TONE_GEN_LEVEL

≤

10.

Note: the energy level at which the tones are generated to

the speaker (codec 1) while the speakerphone is active, is

controlled by the TONE_GEN_LEVEL tunable parameter and

the vol_level.

Table 2-9: TUNABLE PARAMETERS: Speakerphone

Index Parameter Name Description Default

2-61

2—SOFTWARE ISD-T360SB

ISD

Table 2-10: TUNABLE PARAMETERS: Memory Support

Index Parameter Name Description Default

62 Memory Device Size:

NUM_OF_BLOCKS_IN_M

Deﬁnes the nubber of blocks (each block is of 4096 bytes) in

every memory device (Flash or ARAM/DRAM). The number

and type of connected devices are deﬁned by the CFG

command.

Flash Device Size (Mbits) Number of Blocks Value

4 128

8 256

16 512

ARAM/DRAM Device Size (Mbits) Number of Blocks Value

16 508

128

63 Memory Size for Testing

NUM_OF_BLOCKS_FOR_

TEST

Deﬁnes the nubber of blocks (each block is of 4096 bytes) in

every memory device (Flash or ARAM/DRAM) for production

line testing purposes.

The number should be small to minimize testing time during

the production sequence. However, the number of blocks

should be larger than the number of expected bad blocks in

the memory device.

In case of value=0, no productiontest is performed.

In any case other than value= 0, the number of blocks is

deﬁned by the parameter value, and a production testing

cycle is performed after RESET.

Legal values: 0 to 128.

Note: If power fails during production testing cycle, the

memory status is unpredicted. The memory device should be

replaced and the production test should be repeated.

64 ARAM Quality Level:

MAX_DEFECT_NIBBLES_I

N_BLOCK

Deﬁnes the maximum allowed bad nibbles in ARAM block

(each block is of 8192 nibbles). A nibble (4 bits) is considered

bad if any bit is defected.

If the number of bad nibbles in a block exceeds the maximum

allowed value, the block is marked as bad block and is not

used for voice storage.

Legal values: 0 to 255.

2-62

2—SOFTWARE

ISD-T360SB

Voice Solutions in Silicon™

Example

VC Volume Control

vol_level

Controls the energy level of all the output generators (playback, tone generation, and voice synthe-

sis), with one command. The resolution is ±3 dB.

The actual output level is composed of the tunable level variable, plus the

vol_level

. The valid range

for the actual output level of each output generator is defined in Table 2-5.

For example, if the tunable variable VCD_LEVEL (parameter number 21) is 6, and

vol_level

is –2, then

the output level equals VCD_LEVEL +

vol_level

= 4.

Example

Table 2-11: TUNABLE PARAMETERS: Codec Support (Samples)

Index Parameter Name Description Default

65 Channel 0 Delay:

CFRD0

The delay of codec channel 0 from Frame Synch 0 (CFS0) to

start of valid data.

Legal values: 0 to 255

66 Channel 1 Delay:

CFRD1

The delay of codec channel 1 from Frame Synch 0 (CFS0) to

start of valid data.

Legal values: 0 to 255

67 Channel 2 Delay:

CFRD2

The delay of codec channel 2 from Frame Synch 0 (CFS0) to

start of valid data.

Legal values: 0 to 255

68 Frame Synch Delay:

CFSD

The delay of Frame Synch 1 (CFS1) from Frame Synch 0 (CFS0).

Legal values: 0 to 255

69 Data Valiid Delay:

CFET

The delay between Frame Synch 0 (CFS0) to end of valid data

of all channels.

Legal values: 0 to 255

TUNE 17 02BC

Byte sequence: Microcontroller 15 17 02 BC

VoiceDSP 15 17 02 BC

Description: Set the minimum period for busy detection to 700 (7 seconds).

VC 04

Byte sequence: Microcontroller 28 04

VoiceDSP 28 04

Description: Set the volume level to VCD_LEVEL + 4.

2-63

2—SOFTWARE ISD-T360SB

ISD

WMSG Write Message

data

Writes 32 bytes of data to the current position of the message pointer, and advances the message

pointer by 32 bytes.

If the VoiceDSP processor is in the IDLE state, the command opens the current message, switches the

VoiceDSP processor to the MSG_OPEN state, sets the message pointer to the beginning of the mes-

sage data, and writes the 32 bytes of data.

To add data at the end of an existing message, issue the SMSG command to the last page of the mes-

sage. Issue the WMSG command with a buffer consisting of 32 FF bytes (this has no effect on the cur-

rent data in the page). A subsequent WMSG command adds a new block to the message, and writing

continues at the beginning of the new block.

The microcontroller must issue an S command to close the message and switch the VoiceDSP proces-

sor to the IDLE state.

NOTE When updating an existing message, bits can only be cleared, but not set.

If the current message is undefined, ERR_INVALID is reported.

Example

WMSG 32 bytes

Byte sequence: Microcontroller 31 32 bytes of data to write

VoiceDSP 31 echo 32 bytes of data

Description: Write 32 bytes in the message memory.

2—SOFTWARE

ISD-T360SB

2-64

Voice Solutions in Silicon

™

3—SCHEMATIC DIAGRAMS ISD-T360SB

3-1

ISD

Chapter 3ÑSCHEMATIC DIAGRAMS

3.1 APPLICATION INFORMATION

The following schematic diagrams for a

VoiceDSP processor Reference design unit.

This reference design includes three basic

clusters:

• An 80C51 MicroController.

• VoiceDSP processor cluster, including a

TP3054 codec, and an ISDT360SB

controlling a Flash device.

• User interface that includes one 16-digit

LCD, and a 16-key (4 x 4) keypad.

3—SCHEMATIC DIAGRAMS

ISD-T360SB

3-2

Voice Solutions in Silicon

™

4—PHYSICAL DIMENSIONS ISD-T360SB

4-1

ISD

Chapter 4ÑPHYSICAL DIMENSIONS

Figure 4-1: 80-Pin Plastic Quad Flat Package, Top and Bottom—Type: Metric PQFP, 14x14 Body

1. All dimensions are in millimeters. All dimensions and tolerances conform to ANSI Y14.5-1982.

4—PHYSICAL DIMENSIONS

ISD-T360SB

4-2

Voice Solutions in Silicon

™

Figure 4-2: 80-Pin Plastic Quad Flat Package,

Side—Type: Metric PQFP, 14x14

Body Table 4-1: Packaging Dimensions

Symbol Min. Nom. Max.

A— 2.82 3.00

A10.10 0.15 0.25

A22.55 2.67 2.75

D17.20 BSC.

D114.00 BSC.

D212.35BSC.

ZD0.825 REF.

E17.20 BSC.

E114.00 BSC.

E212.35 BSC.

ZE0.825 REF.

L0.73 0.88 1.03

N80

e0.65 BSC.

b0.22 0.38

b10.22 0.30 0.33

ccc 0.12

Part No. 2201298D5008

2045 Hamilton Ave.

San Jose, California 95125-5904

Tel: 408/369-2400

Fax: 408/369-2422

http://www.isd.com

IMPORTANT NOTICES

The warranty for each product of ISD (Information Storage

Devices, Inc.), is contained in a written warranty which governs

sale and use of such product. Such warranty is contained in the

printed terms and conditions under which such product is sold, or

in a separate written warranty supplied with the product. Please

refer to such written warranty with respect to its applicability to

certain applications of such product.

These Product may be subject to restrictions on use. Please

contact ISD, for a list of the current additional restrictions on

these Product. By purchasing these Product, the purchaser of

these Product agrees to comply with such use restrictions. Please

contact ISD for clarification of any restrictions described herein.

ISD, reserves the right, without further notice, to change the ISD

ChipCorder product specifications and/or information in this

document and to improve reliability, functions and design.

ISD assumes no responsibility or liability for any use of the ISD

ChipCorder Product. ISD conveys no license or title, either

expressed or implied, under any patent, copyright, or mask work

right to the ISD ChipCorder Product, and ISD makes no warranties

or representations that the ISD ChipCorder Product are free from

patent, copyright, or mask work right infringement, unless

otherwise specified.

Application examples and alternative uses of any integrated

circuit contained in this publication are for illustration purposes

only and ISD makes no representation or warranty that such

applications shall be suitable for the use specified.

The 100-year retention and 100K record cycle projections are

based upon accelerated reliability tests, as published in the ISD

Reliability Report, and are neither warranted nor guaranteed by

ISD.

Information contained in this ISD ChipCorder data sheet

supersedes all data for the ISD ChipCorder Product published by

ISD prior to December, 1998.

This data sheet and any future addendum to this data sheet is

(are) the complete and controlling ISD ChipCorder product

specifications. In the event any inconsistencies exist between the

information in this and other product documentation, or in the

event that other product documentation contains information in

addition to the information in this, the information contained

herein supersedes and governs such other information in its entirety.

reserved. ISD is a registered trademark of ISD. ChipCorder is a

trademark of ISD. All other trademarks are properties of their

respective owners.