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D6571E

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

Unspecified 

D6571E Data Sheet

playback may be resumed from the same point.

Normally, during playback, the status word will contain

information about the line signals and the playback

status and will notify the HOST when the end of

message is reached.

code of detected DTMF signals is transmitted to the

HOST for further processing. Host selects whether the

D6571E reports detection of the 12 DTMF tones or 16

DTMF tones.

Call Progress Tone (CPT) Detection

Message Deletion

The D6571E allows selective deletion of any

prerecorded message from memory. After each deletion

the message directory is updated accordingly. Message

deletion does not free the memory space. Memory is

freed by using the “Garbage Collection” command.

Message Time Stamp

The HOST may attach two 16-bit data words to each of

the 128 messages of the D6571E. This data can be used

for time/date stamping the recorded message and any

other information defined by the Host. Time Stamp can

be modified after message has been recorded.

Volume Control

The D6571E allows control of the signal that is playing

to the CODEC. This function affects the level of the

played back signal in the Message Playback and Voice

Prompt modes, as well as the level of the looped back

signal in the Record and Line Monitor modes.

The D6571E monitors the line for incoming telephone

line signals and detects the presence of call progress

tones in a predefined frequency region. The D6571E

supports call progress tone detection by utilizing a

filter/detector with a bandwidth of 300-640 Hz.

Indication of the presence of call progress tones is

transferred to the HOST, and may be used for

terminating recording.

Caller Identification (CID and CWCID)

The D6571E can monitor and demodulate the FSK

signals that provide CID information from the Central

Office (CO). Both Bell 202 and V.23 demodulation is

supported and the D6571E will automatically adapt to

the FSK modulation provided from the CO.

Caller Alert Signal (CAS) Detection

The D6571E supports detection of the Caller Alert

Signal (CAS) in all functional modes for Call Waiting

CID support. The same signal known as Idle State Tone

Alert Signal is a part of the V.23 protocol.

Tone Generation

Sensitivity Control

Single and double tone signals can be generated by

D6571E. There are 32 locations provided in the tone

table. No Tone and 12 standard DTMF tones are

predefined and other telephony tones may be added to

the table one time. The HOST can program tones into

any of the 19 remaining entries in this table. The levels

and frequencies are programmable and controlled by

HOST. During tone generation the D6571E monitors the

line.

In case of “cold start” the D6571E can generate No

Tone and 16 preprogrammed standard DTMF tones.

See mode description for details.

DTMF Detection

The D6571E allows independent control of the

sensitivity of the VOX, DTMF, and Call Progress Tone

(CPT), and CAS detectors.

Speed Dial Telephone Number Storage

The D6571E may store up to 128 telephone numbers,

each with up to 16 digits for dialing. The 1024 bytes of

memory can also be used for any other purpose by the

HOST.

Non-Erasable Storage

The D6571E supports 1600 bytes of a non-erasable

storage.

General Purpose Storage

DTMF detection is implemented by the D6571E in

software. This function may be used for remote

operation of the answering device. The identification

The D6571E supports up to 16 sectors of a General

Purpose Storage. Each sector allows 3200 bytes of

storage.

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

10

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

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