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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

OPERATIONAL DESCRIPTION

contents of the memory except for the voice prompt

sectors, tone table, and bad block table.

INITIAL PROCEDURE

No operation should be performed with the new flash

before it is initialized once. Any flash access before

initialization may destroy information about bad blocks

and make flash unusable.

Normally the Flash Hardware Selection and then the

Flash Initialization command may be sent to perform the

Initialization. All memory will be initialized except for the

voice prompt sectors and bad block table.

MODES OF OPERATION

After power up, the PDN signal (pin 22) should be set

high followed by the RESET pulse (Refer to Figure 4 for

the timing). Upon detecting falling edge of the RESET

pulse, the D6571E checks some predefined locations in

the Flash Memory to determine if Flash was initialized

and responds to one of the following situations:

1. Flash memory was previously initialized -

“warm start”. The D6571E restores the

previous conditions and system parameters. The

message directory and all messages remain saved.

The D6571E returns garbage collection status

with the “cold start” bit reset (0).

2. Flash memory was not previously initialized -

“cold start”. The D6571E returns garbage

collection status with the “cold start” bit set (1).

After sending Garbage Collection status the D6571E

will enter Idle mode. After sending RESET the Host

should wait for ACK pin to become low and then read

status. No command should be sent to the D6571E until

host reads the Garbage Collection Status.

If this is a “cold start” only commands that do not

require flash access are available: Idle, Line Monitor,

Read Memory Status, SpeakerPhone, Tone Generation

(16 standard DTMF tones only), Data Pump, and Self

Test and Initialization. If any other command is issued,

the D6571E will stay in Idle mode and return Idle status.

The D6571E behaves in the same manner if the flash is

not initialized (“cold start” condition) or there is no

flash in the system (“no flash” condition).

To initialize flash memory Flash Hardware Selection

(Test Mode = 0101) be issued first because no other Self

Test and Initialization command will be accepted until

this command is issued! After Flash Hardware Selection

only Test Mode = 0011 (Fast Self Test) and Test Mode

= 0001 (Flash Initialization) are available.

The D6571E is normally in Idle mode. Each time a

command other than Idle is issued, the system will enter

the new mode. From some of the modes, the system will

automatically return to Idle mode after completion of the

operation. Other modes (Record, Playback, Tone

Generation, Line Monitoring, Voice Prompt Generation

and SpeakerPhone) require an Idle command to return to

Idle mode.

There are 16 modes of operation. Each of these modes

is entered from the monitor program through Idle mode.

The 16 modes are as follows:

0. Idle - The D6571E performs command polling. It

checks the command register in the HOST-D6571E

interface and transfers to the requested operating

mode.

1. Record - The D6571E performs speech compression

and records a message into the Flash memory.*

2. Playback - The D6571E performs message playback

using compressed speech data stored in the Flash

memory.*

3. Read Memory Status - The D6571E returns

information on the Memory status to the HOST,

e.g., the number of messages stored in the Flash

memory, memory full condition, program ROM

checksum status, voice prompt checksum status

and if Garbage collection is recommended.

4. Write Data to Storage - In this mode the D6571E

receives data from the HOST and stores it either in

the Telephone Number Storage, or Non-Erasable

Storage, or General Purpose Storage in the flash

under index number given by the HOST.

5. Read Data from Storage - The D6571E returns to

the HOST data stored in Telephone Number

Storage, or Non-Erasable Storage, or General

Purpose Storage under the index number given by

the HOST.

The Flash Hardware Selection and the Fast Self Test

command can be issued to confirm the configuration of

the flash if necessary. Fast Test will destroy the

6. Tone Generation - The D6571E generates a single

or double tone with programmable parameters. *

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

12

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

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