Product Info

LTE-A Module Series
EG12 Hardware Design
EG12_Hardware_Design 53 / 100
In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge. The PCM_SYNC falling edge represents the MSB. In this mode, PCM interface supports 256kHz,
512kHz, 1024kHz or 2048kHz PCM_CLK at 8kHz PCM_SYNC, and also supports 4096kHz PCM_CLK at
16kHz PCM_SYNC.
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge. The PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
256kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only.
EG12 supports 16-bit linear data format. The following figures show the primary mode’s timing
relationship with 8kHz PCM_SYNC and 2048kHz PCM_CLK, as well as the auxiliary mode’s timing
relationship with 8kHz PCM_SYNC and 256kHz PCM_CLK.
PCM_CLK
PCM_SYNC
PCM_OUT
MSB
LSB
MSB
125us
1 2 256255
PCM_IN
MSB
LSBMSB
Figure 24: Primary Mode Timing
PCM_CLK
PCM_SYNC
PCM_OUT
MSB
LSB
PCM_IN
125us
MSB
1 2 3231
LSB
Figure 25: Auxiliary Mode Timing