Integrator's Manual GR47/GR48

5. SYSTEM CONNECTOR INTERFACE
33
LZT 123 7589 R1A
5.8 PCM Digital Audio
Figure 5.6 shows the PCM (Pulse Code Modulation) digital audio
connection for external devices. These connections can be used to process
PCM digital audio signals, bypassing the radio device’s internal analogue
audio CODEC.
Figure 5.6 Pin connections to digital audio
1RWH When no external audio processing is performed, the following pins must
be connected together:
• PCMDLD to PCMIN
• PCMULD to PCMOUT
Electrical characteristics
Digital 2.75 V CMOS input/output electrical characteristics apply.
Pin Signal Dir Function
52 PCMCLK O PCM clock
51 PCMSYNC O PCM frame sync
47 PCMULD I PCM audio input to DSP
48 PCMDLD O PCM audio output from DSP
50 PCMIN I PCM audio input to Codec
49 PCMOUT O PCM audio output to Codec
DSP CODEC
PCMSYNC & PCMCLK
Analogue
audio
signals
PCMIN
PCMOUT
PCMDLD
PCMULD
Link for internal
digital-audio processing
GR47
System connector