¡ Semiconductor
PCMSO
MSM7570L-01/02
Transmit PCM data output.
PCM is output from MSB in synchronization with the rising edge of BCLK and XSYNC.
PCMSI
Transmit PCM data input.
This signal is converted to the transmit ADPCM data. PCM is shifted in synchronization with
the falling edge of BCLK. Normally, this pin is connected to PCMSO.
PCMRO
Receive PCM data output.
PCM is the output signal after ADPCM decoder processing. This signal is output serially from
MSB in synchronization with the rising edge of BCLK and RSYNC.
PCMRI
Receive PCM data input.
PCM is shifted on the rising edge of the BCLK and input from MSB. Normally, this pin is
connected to PCMRO.
IS
Transmit ADPCM signal output.
After having encoded PCM with ADPCM, this signal is output from MSB in synchronization
with the rising edge of BCLK and XSYNC. This pin is an open drain output and remains in a high
impedence state during power-down. IS requires a pull-up resistor.
IR
Receive ADPCM signal input.
This input signal is shifted serially on the falling edge of BCLK in synchronization with RSYNC,
and input from MSB.
BCLK
Shift clock input for the PCM data (PCMSO, PCMSI, PCMRO, PCMRI) and the ADPCM data(IS,
IR) .
The frequency is set in the 64 kHz to 2048 kHz range.
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