Texas Instruments TMS320C6201 Reference Manual page 362

Data Transmission and Reception
Figure 11–26. Decision Tree Response to Receive Frame Synchronization Pulse
Figure 11–27. Unexpected Receive Synchronization Pulse
CLKR
FSR
DR
A1 A0
RRDY
RBR-to-DRR copy
RSYNCERR
11-44
Receive frame
sync pulse occurs
Unexpected
frame sync
pulse ?
Yes
RFIG = 1 ?
Yes
Case 1:
Ignore frame pulse.
Receiver continues running.
Unexpected frame synchronization
B7 B6 B5 B4 C7 C6
Read of DRR
Case 2:
No
Normal reception
Start receiving data
Case 3:
No
Abort reception.
Set RSYNCERR.
Start next reception.
Previous element is lost.
C5 C4 C3 C2 C1 C0
RBR-to-DRR copy Read of DRR