Product Info

LTE Standard Module Series
EC21_Series_Mini_PCIe_Hardware_Design
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The following figure shows the timing relationship in primary mode with 8 kHz PCM_SYNC and 2048 kHz
PCM_CLK.
Figure 8: Timing in Primary Mode
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, the PCM interface operates with a
256 kHz, 512 kHz, 1024 kHz or 2048 kHz PCM_CLK and an 8 kHz, 50 % duty cycle PCM_SYNC.
The following figure shows the timing relationship in auxiliary mode with 8 kHz PCM_SYNC and 256 kHz
PCM_CLK.
Figure 9: Timing in Auxiliary Mode