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D6571E

EASYTAD™ Chip for an All- Digital Telephone Answering Machine with Flash Memory Interface

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D6571E Data Sheet

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

µ-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

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

3

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

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