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MSM7708-02

Serial Register Interface ADPCM CODEC for Telephone Recording

Oki Electric Industry 

¡ Semiconductor

MSM7708-02

PCMSO

Transmit PCM data output.

This PCM output signal is output from MSB synchronously with the rising edge of BCLK and

XSYNC.

PCMSI

Transmit PCM data input.

This signal is converted to the ADPCM data. The PCM signal is shifted in on the falling edge of

BCLK. Normally, this pin is connected to PCMSO.

PCMRO

Receive PCM data output.

This PCM signal is the output signal after ADPCM decoder processing. This signal is serially

output from MSB synchronously with the rising edge of BCLK and RSYNC.

PCMRI

Receive PCM data input.

This PCM input signal is shifted in on the rising edge of BCLK and is input from MSB. Normally,

this pin is connected to PCMRO.

IS

Transmit ADPCM signal output.

This signal is the output signal after ADPCM encoding, and is serially output from MSB

synchronously with the rising edge of BCLK and XSYNC. This pin is an open drain output which

remains in a high impedence state during power down. It requires pull-up resistor.

IR

Receive ADPCM signal input.

This input signal is shifted in serially on the rising edge of BCLK synchronously with RSYNC and

is input from MSB.

BCLK

Shift clock input for the PCM data (PCMSO, PCMSI, PCMRO, PCMRI) and the ADPCM data(IS,

IR) . The frequency is in the 64 kHz to 2048 kHz range.

XSYNC

8 kHz synchronous signal input for transmit PCM and ADPCM data.

This signal should be synchronized with BCLK. XSYNC is used for indicating the MSB of the

transmit serial PCM and ADPCM data stream.

RSYNC

8 kHz synchronous signal input for receive PCM and ADPCM data.

This signal should be synchronized with BCLK signal. RSYNC is used for indicating the MSB

of the receive serial PCM and ADPCM data stream.

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