GM47/GM48 INTEGRATOR’S MANUAL
52
LZT 123 7263 R1C
2.7 PCM Digital Audio
Figure 2.4 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 module’s internal
analogue audio CODEC.
Figure 2.4 Pin connections to digital audio
Note! When no external audio processing is performed, the following pins
must be connected together:
PCMDLD to PCMIN
PCMULD to PCMOUT
Electrical characteristics
Digital 2.75V CMOS input/output electrical characteristics apply.
Pin Signal Dir Function
52 PCMCLK OPCM clock
51 PCMSYNC OPCM frame sync
47 PCMULD IPCM audio input to DSP
48 PCMDLD OPCM audio output from DSP
50 PCMIN IPCM audio input to Codec
49 PCMOUT OPCM audio output to Codec
DSP CODEC
PCMSYNC & PCMCLK
Analogue
audio
signals
PCMIN
PCMOUT
PCMDLD
PCMULD
Link for internal
digital-audio processing
GM47
System connector