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D6571E

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

Unspecified 

D6571E Data Sheet

sensitivity value specified in bits 0 through 4. The

Status will reflect the sensitivity settings.

The Sensitivity Control command can be issued in

Record, Playback, Voice Prompt, Line Monitor, and

Tone Generation Mode without interrupting these

modes. When issued in one of these modes, the status

will be the status of the current operating mode. The

current sensitivity setting can not be read during

operating modes.

The performance of this mode is the same in case of

“cold” and “warm start.”

10). Test Mode = 1011 (GPIO access).

In this mode the D6571E allows Host access to GPIOs.

Host can write and read data to/from GPIOs using this

command.

11). Test Mode = 1101 (IOM -2 compatible codec

interface configuration)

In this mode the D6571E sets configuration of the

GCI/IDL compatible codec interface. By issuing this

command Host activates GCI/IDL compatible codec

interface. By sending Codec Hardware Selection

command (Test Mode = 0100) host disables GCI/IDL

interface and activates “old” codec interface. By default

“old” codec interface is active. See command set for

details.

Voice Prompt Generation

In this mode the D6571E plays back a speech segment

using the speech decompression algorithm. Speech

should be previously stored in Flash memory or external

ROM. The D6571E will support up to four 64K byte

sectors. Each sector will store up to 128 prompts. The

default sector is sector 0. If the Host is playing from

sector 0 only, no Set Sector command is required. If

however, the Host selects sector 1 this continues to be

in effect until the Host changes it again. In addition, the

Host may change the sector while in Idle mode without

leaving Idle mode and this change will remain in effect

until another command is issued to change the voice

prompt sector. As a general procedure, the Host first

sets the sector by setting bit 10 and including the sector

number in bits 2-0. Next, the Host loads the new phrase

by setting bit 11 and including the phrase number to

play (0-127) in bits 0-6 in the command word. The

D6571E will start playing the phrase and send the status

word to the HOST containing line status and playback

status. The line status will contain information about

DTMF, CAS, and CPT in the same manner as the Line

Monitor command. The status word also contains two

flags: END OF PLAY and READY. The HOST can

continuously monitor the status by issuing a Voice

Prompt command with both bit 10 and 11 equal 0 and act

according to the returned flags.

READY - this bit (bit 10) is set to “1” by the D6571E two

frames before the end of the phrase playback. It

indicates that the D6571E is ready to load a new phrase.

If the Host is playing from the same sector, no

additional set sector command is required.

The Host may send a change sector command, if

required, during the playback from the previous sector

without interrupting the playback. The next phrase will

be loaded from the new sector. Sending a Load

command while the READY bit is “0” will not load the

new phrase. If the HOST sends Load command

immediately after status with READY bit high, there will

be no silence gap between the two phrases. The HOST

can delay the Load command for a few frames and create

a gap between two phrases. In that case, the D6571E

will transmit silence to the CODEC but will stay in Voice

Prompt mode. The Voice Prompt mode supports

FlexiSpeech in a manner similar to Playback mode.

END OF PLAY - this bit (bit 7) is set one frame after the

Ready bit and indicates that the D6571E is playing the

last frame of the phrase.

While in Voice Prompt Generation mode, the HOST may

issue a command to change the DTMF, CAS, VOX, and

CPT Sensitivity or the Volume without interrupting this

mode. The status word will reflect the status for Voice

Prompt mode. Therefore, line monitoring will not be

interrupted. The Voice Prompt mode is terminated by

sending an Idle command.

The external ROM can be used as the Voice Prompt

storage if only one 4M flash is activated in the system

or no flash is installed.

Notes:

1) If the phrase number is higher than the last phrase

recorded in the memory, the status word will return END

OF PLAY with READY bits high and no playback will be

performed.

2) If the D6571E does not find the Voice Prompt area it

will return Idle status.

DS6571E.2

DSP GROUP, INC., 3120 SCOTT BOULEVARD

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

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