NSB–6
System Module
PAMS Technical Documentation
Page 25
Issue 1 06/2000
E
Nokia Mobile Phones Ltd.
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 di-
viding the PCMDClk. The PCMDClk frequency is 512 kHz. PCMSClk fre-
quency is 8.0 kHz.
LSB
LSB
PCMDClk
PCMSClk
PCMTxData
PCMRxData
MSB
MSB
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