User's Manual

UMTS/HSDPA Module Series
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 46 / 78
3.12. PCM and I2C Interface
UC15 provides one Pulse Code Modulation (PCM) digital interface for audio design with 16-bit linear data
formats, which supports the following modes:
 Primary mode (short sync, works as both master and slave)
 Auxiliary mode (long sync, works as master only)
UC15 supports an 8 kHz short sync mode at 2048 kHz, the data is sampled on the falling edge of the
PCM_CLK and transmitted on the rising edge, and the PCM_SYNC falling edge represents the MSB.
UC15 also supports an 8 kHz long sync mode at 128 kHz, the data is sampled on the falling edge of the
PCM_CLK and transmitted on the rising edge, and the PCM_SYNC rising edge represents the MSB.
The following figures show the different timing relationships of these modes.
Figure 27: Primary Mode Timing