TMS320F28069F-Q1: Can Mcbsp send and receive use the same frame synchronization clock signal?

Yale,

I'm copying the relevant sections from the TRM SPRUH18(starting at page 893); but the short answer is that yes it is possible:

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).

Best,

Matthew