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PAMS Technical Documentation
System Module
NSB-7
Issue 1 06/00
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Nokia Mobile Phones Ltd.
Page 27
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.
LSB
LSB
PCMDClk
PCMSClk
PCMTxData
PCMRxData
MSB
MSB
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