Pcie Interface; Pcm And I2C Interfaces - Quectel EM12-G Hardware Design

NOTE
S
"*" means under development.

3.8. PCIE Interface

Under development

3.9. PCM and I2C Interfaces

EM12-G supports audio communication via Pulse Code Modulation (PCM) digital interface and I2C
interface.
The PCM interface supports the following modes:

Primary mode (short frame synchronization, works as both master and slave)

Auxiliary mode (long frame synchronization, works as master only)
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, the 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.
EM12-G 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.
EM12-G_Hardware_Design
LTE-A Module Series
EM12-G Hardware Design
34 / 62