Audio Control; Pcm Serial Interface - Nokia NSB-7 Series Service Manual

PAMS Technical Documentation

Audio Control

PCM serial interface

The interface consists of following signals: a PCM codec master clock (PCMDClk), a
frame synchronization signal to DSP (PCMSClk), a codec transmit data line (PCMTX) and
a codec receive data line (PCMRX). The COBBA-GJP generates the PCMDClk clock, which
is supplied to DSP SIO. The COBBA-GJP also generates the PCMSClk signal to DSP by
dividing the PCMDClk. The PCMDClk frequency is 512 kHz. PCMSClk frequency is 8.0 kHz.
PCMDClk
PCMSClk
PCMTxData
PCMRxData
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