LTE-A Module Series
EM12-G Hardware Design
EM12-G_Hardware_Design 35 / 62
PCM_CLK
PCM_SYNC
PCM_OUT
MSB
LSB
MSB
125us
1
2
256
255
PCM_IN
MSB
LSB
MSB
Figure 17: Primary Mode Timing
PCM_CLK
PCM_SYNC
PCM_OUT
MSB
LSB
PCM_IN
125us
MSB
1
2
32
31
LSB
Figure 18: Auxiliary Mode Timing
The following table shows the pin definition of PCM and I2C interfaces which can be applied on audio
codec design.
Table 10: Pin Definition of PCM and I2C Interfaces
Pin Name
Pin No.
I/O
Description
Comment
PCM_IN
22
DI
PCM data input
1.8V power domain.
PCM_OUT
24
DO
PCM data output
1.8V power domain.