7/25

¡ Semiconductor

MSM7575

PCMRI

Receive PCM data input.

This PCM input signal is shifted on the falling edge of BCLK and input from MSB.

BCLK

Shift clock input for the PCM data (PCMSO, PCMRI).

The frequency is set in the range of 64 kHz to 2048 kHz.

XSYNC

8 kHz synchronous signal input for Transmit PCM data.

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

transmit serial PCM.

Be sure to input the XSYNC signal because it is also used as the input of the timing circuit and

the clock source of the tone generator.

RSYNC

8 kHz synchronous signal input for Receive PCM data.

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

of the receive serial PCM.

Figure 3 PCM Interface Basic Timing Diagram

BCLK

XSYNC

PCMSO

RSYNC

PCMRI

MSB

LSB

MSB

LSB

8kHz

(125

ms)