D6571E Data Sheet

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490

TABLE OF CONTENTS:

GENERAL DESCRIPTION....................................................................................................................................................................5

FEATURES ........................................................................................................................................................................................... 5
CHIP CONFIGURATION.................................................................................................................................................................... 6
ADDITIONAL SYSTEM COMPONENTS (supplied by the customer according to DSP Group's specifications).............. 6
PIN DESCRIPTIONS............................................................................................................................................................................ 7

FUNCTIONAL DESCRIPTION............................................................................................................................................................9

HOST Interface..................................................................................................................................................................................... 9
Voice Message Recording Incoming and Outgoing Messages ................................................................................................... 9
Digital Voice-Activated Recording (VOX)....................................................................................................................................... 9
Automatic Gain Control...................................................................................................................................................................... 9
Message Playback............................................................................................................................................................................... 9
Offset and FLEXISPEECH

.............................................................................................................................................................. 9

Message Deletion.............................................................................................................................................................................. 10
Message Time Stamp ........................................................................................................................................................................ 10
Volume Control................................................................................................................................................................................... 10
Tone Generation................................................................................................................................................................................. 10
DTMF Detection................................................................................................................................................................................ 10
Call Progress Tone (CPT) Detection............................................................................................................................................... 10
Caller Identification (CID and CWCID) .......................................................................................................................................... 10
Caller Alert Signal (CAS) Detection................................................................................................................................................ 10
Sensitivity Control............................................................................................................................................................................. 10
Speed Dial Telephone Number Storage.......................................................................................................................................... 10
Non-Erasable Storage........................................................................................................................................................................ 10
General Purpose Storage................................................................................................................................................................... 10
Self Test and Initialization ................................................................................................................................................................ 11
Reports ................................................................................................................................................................................................ 11
Voice Prompt Generation.................................................................................................................................................................. 11
Near End Echo Cancellation............................................................................................................................................................. 11
Full Duplex Digital SpeakerPhone ................................................................................................................................................... 11
Power Down Mode ............................................................................................................................................................................ 11

OPERATIONAL DESCRIPTION .......................................................................................................................................................12

INITIAL PROCEDURE...................................................................................................................................................................... 12
MODES OF OPERATION................................................................................................................................................................. 12
DESCRIPTION OF MODES OF OPERATION............................................................................................................................... 13

Idle................................................................................................................................................................................................... 13
Record ............................................................................................................................................................................................. 13
Playback.......................................................................................................................................................................................... 14
Read Memory Status.................................................................................................................................................................... 15
Telephone Number Storage......................................................................................................................................................... 16
Non-Erasable Storage................................................................................................................................................................... 16
General Purpose Storage (GPS)................................................................................................................................................... 16
Tone Generation Mode ................................................................................................................................................................ 16
New Tone Definition..................................................................................................................................................................... 17
FSK Modem................................................................................................................................................................................... 17
Line Monitoring Mode ................................................................................................................................................................. 17
CID Submode................................................................................................................................................................................. 18
Delete Message ............................................................................................................................................................................. 18
Set/Modify Time Stamp ................................................................................................................................................................ 19
Get Time Stamp .............................................................................................................................................................................. 19
Get Available Record Time .......................................................................................................................................................... 19

D6571E Data Sheet

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490

Self Test and Initialization............................................................................................................................................................ 19
Voice Prompt Generation.............................................................................................................................................................. 22
Program Voice Prompt .................................................................................................................................................................. 23
Full Duplex SpeakerPhone Operation......................................................................................................................................... 24
Re-Compression Mode................................................................................................................................................................. 27

HOST INTERFACE PERFORMANCE..............................................................................................................................................28

Power Down Operation.........................................................................................................................................................................30

COMMAND SET ...................................................................................................................................................................................29

0. IDLE ................................................................................................................................................................................................ 29
1. RECORD......................................................................................................................................................................................... 29
2. PLAYBACK................................................................................................................................................................................... 33
3. READ MEMORY STATUS......................................................................................................................................................... 35
4. WRITE TELEPHONE NUMBER................................................................................................................................................. 37
5. READ TELEPHONE NUMBER................................................................................................................................................... 40
6. TONE GENERATION................................................................................................................................................................... 42
NEW TONE INITIALIZATION.................................................................................................................................................. 44
FSK Modem.................................................................................................................................................................................... 45
7. LINE MONITOR............................................................................................................................................................................ 51
8. DELETE MESSAGE...................................................................................................................................................................... 52
9. SET/MODIFY TIME STAMP ..................................................................................................................................................... 53
10. GET TIME STAMP..................................................................................................................................................................... 53
11. GET AVAILABLE RECORD TIME ........................................................................................................................................... 55
12. SELF TEST AND INITIALIZATION....................................................................................................................................... 55
13. VOICE PROMPT PLAYBACK.................................................................................................................................................. 71
PROGRAM VOICE PROMPT.................................................................................................................................................... 72
14. SPEAKER PHONE...................................................................................................................................................................... 74
16. Re-Compress Message .............................................................................................................................................................. 82

FUNCTIONAL BLOCKS .....................................................................................................................................................................84

DSP CORE........................................................................................................................................................................................... 84
ADDRESS MUX ................................................................................................................................................................................ 84
FLASH MEMORY INTERFACE...................................................................................................................................................... 84
CLOCK GENERATOR....................................................................................................................................................................... 84

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-law/A-law ENCODER..................................................................................................................................................................... 84

CODEC INTERFACE......................................................................................................................................................................... 84
I/O ADDRESS DECODER................................................................................................................................................................. 84
HOST D6571E COMMUNICATION INTERFACE ...................................................................................................................... 83

DATA TRANSFER MODES ................................................................................................................................................................86

FUNCTIONAL DESCRIPTION........................................................................................................................................................ 86
OPERATIONAL DESCRIPTION ..................................................................................................................................................... 86

COMMAND SET FOR DATA TRANSFER MODES ......................................................................................................................92

1. DATA PUMP FROM CODEC TO HOST (Record from Codec to Host)............................................................................... 92
2. DATA PUMP FROM HOST TO CODEC (Playback from Host to Codec)............................................................................ 95
3. DATA STORAGE (From Host to Flash).................................................................................................................................... 98
4. DATA RETRIEVAL (From Flash to Host)............................................................................................................................... 100
5. DATA COMPRESSION (From Host to Host)......................................................................................................................... 102
6. DATA DECOMPRESSION (From Host to Host).................................................................................................................... 104

APPLICATION HINTS ..................................................................................................................................................................... 106

ELECTRICAL CHARACTERISTICS............................................................................................................................................. 106

D6571E Data Sheet

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

SANTA CLARA, CA 95054 PH: 408 986-4300 FAX: 408 986-4490

EASYTAD

Chip for an All-Digital

Telephone Answering Machine

with Flash Memory Interface

GENERAL DESCRIPTION

The D6571E chip is a digital speech/signal processing subsystem that implements all functions of T

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PEECH

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speech

compression and voice prompts, telephone line signal processing, flash memory management and True FULL Duplex
SpeakerPhone

for an all digital answering machine. The D6571E is fully controlled by the system HOST through a

simple interface protocol. The HOST processor provides activation and control of all system functions such as speech
recording and playback, DTMF and call progress tone detection, DTMF and tone generation, and voice prompting.

The fully digital solution has no moving parts, yielding high reliability. The chip's programmability enables a full range of
answering, recording and playback features for the end user. The D6571E is a single-chip, digital signal processor that
includes all of the necessary circuitry to interface with an external HOST, flash memory, and codec.

FEATURES

�

Superior quality T

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PEECH

�

Triple Rate Coder

allowing selectable 11, 15 or 25 minutes of recording
time per each 4 Mbit Flash Memory

�

PCM Recording

�

Flexible storage of incoming messages (ICM),
outgoing messages (OGM). Supports multiple OGMs
and multiple mailboxes.

�

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PEECH

�

, natural-sound voice prompting, for

Day/Time stamp and voice instructions

�

LEXI

PEECH

variable speed, natural sound

playback (50% - 200%)

�

DTMF generation and detection with near-end echo
cancellation for superior performance

�

Extended DTMF detection (A, B, C, D)

�

Automatic Gain Control

�

True FULL Duplex SpeakerPhone

with both

acoustical and near-end echo cancellation

�

Caller ID and Call Waiting CID demodulation (both
Bell 202 and V.23)

�

FSK modem for CID and

-5 support

�

Supports 4 Mb or 16 Mb Flash Memory Devices

�

Supports Time Stamp (message tag) modification

�

Programmable DTMF, CPT, VOX, CAS, and FSK
Detectors Sensitivity

�

Digital Volume Control

� �

-law and A-law codec support, selectable Master

and Slave mode, selectable sampling rate.

�

General Purpose (CID) and Non-Erasable Storages

D6571E

Figure 1. D6571E Block Diagram

* Dashed lines indicate optional implementation
** Only supported with single 4Mbit Flash or no

D6571E

DSP

Speech

Processor

Codec

I/O Codec

HOST

Controlle

TEL

LINE

16 Mbit
Flash

4 Mbit
Flash

Voice Prompt
*

4 . . 16

Voice

Prompt

ROM **

MIC
SPEAKER

SpeakerPhone

Codec

All specifications are subject to change without prior notice

Электронный компонент: D6571E