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D6571E

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

Unspecified 

D6571E Data Sheet

µ-law/A-law PCM Data Pump:

The Host sends the command word (which contains data) to the D6571E. The D6571E echoes the received data in the

status word (Data Transfer status).

Data Transfer Command:

(DC1 . . . DC_120)

Data Transfer Status:

(DS1 . . . DS_120)

DATA WORD

(15 - 0)

ECHO OF DATA WORD

(15 - 0)

For both TrueSpeech and µ-law/A-law PCM data pumps, in each frame the Host issues command C2, reads status S2,

then issues command C3. The actual data transfer starts after S3 is received by the Host. After data transfer is completed

the Host should issue the next C2 command. The D6571E checks bits 15 -12 in each C2 and C3 command for the correct

code. If an incorrect code is detected, the D6571E will return to Idle mode.

NOTE: Instead of sending the Data Pump C2 command shown above, the Host can send a Set Volume Level command to

set the volume level. The D6571E will respond with status S2 of Data Pump mode. The ‘Set Volume C2 Command’ and

status S2 are shown below.

Command (C2): Set Volume

1100

1000

100

VOLUME

(15 -12)

(11 - 8)

(7 - 5)

(4 - 0)

For the appropriate VOLUME level settings, please refer to the Set Volume Level command of the Self Test and

Initialization mode (Test Mode = 1000).

Status (S2): Set Volume

1100

000000

EXT TONE

TONE

DTMF

(15 -12)

(11 - 6)

(5)

(4)

TONE

DTMF

EXT TONE

= 1: Call Progress Tone detected.

} : Code of valid DTMF or CAS signal detected.

}

(3 - 0)

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

97

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

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