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15.3.2 Frame Synchronization Generation in the Sample Rate Generator The sample rate generator can produce a frame-synchronization signal (FSG) for use by the receiver, the transmitter, or both. If you want the receiver to use FSG for frame synchronization, make sure FSRM = 1. (When FSRM = 0, receive frame synchronization is supplied via the FSR pin.) If you want the transmitter to use FSG for frame synchronization, you must set: • FSXM = 1 in PCR: This indicates that transmit frame synchronization is supplied by the McBSP itself rather than from the FSX pin. • FSGM = 1 in SRGR2: This indicates that when FSXM = 1, transmit frame synchronization is supplied by the sample rate generator. (When FSGM = 0 and FSXM = 1, the transmitter uses frame-synchronization pulses generated every time data is transferred from DXR[1,2] to XSR[1,2].) In either case, the sample rate generator must be enabled (GRST = 1) and the frame-synchronization logic in the sample rate generator must be enabled (FRST = 0).
15.3.3.1 Operating the Transmitter Synchronously with the Receiver When GSYNC = 1, the transmitter can operate synchronously with the receiver, provided that: • FSX is programmed to be driven by FSG (FSGM = 1 in SRGR2 and FSXM = 1 in PCR). If the input FSR has appropriate timing so that it can be sampled by the falling edge of CLKG, it can be used, instead, by setting FSXM = 0 and connecting FSR to FSX externally. • The sample rate generator clock drives the transmit and receive clocking (CLKRM = CLKXM = 1 in PCR).
