User Manual

GM47/GM48 INTEGRATOR’S MANUAL
52
LZT 123 7263 R1A
2.7 Digital Audio
Digital PCM audio signals allow the connection of a digital audio
source/receiver, bypassing the analogue audio CODEC processing
functions performed within the module.
Figure 2.4 Pin connections to digital audio
Note! When no external audio processing is performed, the following pins
must be connected together:
•PCMDLDtoPCMIN;
• PCMULD to PCMOUT.
Electrical characteristics
Digital 2.75V 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
GM47
System connector