RSYNCERR
RRDY
DR
FSR
C1
C0
B7
A0
CLKR
Unexpected frame synchronization
RBR-to-DRR copy
Read of DRR
B6
B5
B4
C7
C6
C5
C4
C3
C2
A1
RBR-to-DRR copy
Read of DRR
Preliminary
Architecture
www.ti.com
11.2.3.2 Unexpected Receive Frame-Sync Pulse
11.2.3.2.1 Possible Responses to Receive Frame-Sync Pulses
If a frame–synchronization pulse starts the transfer of a new frame before the current frame is fully
received, this pulse is treated as an unexpected frame–synchronization pulse, and the receiver sets the
receive frame–synchronization error bit RSYNCERR in IRQSTATUS (and the legacy RSYNCERR bit
SPCR1_REG[3]) register.
According to the IRQENABLE register settings this condition can generate the COMMONIRQ line to be
asserted low. Writing 1 to the corresponding bit in status register will clear the interrupt.
Using the legacy mode, RSYNCERR bit in SPCR1_REG can be cleared only by a receiver reset or by
a write of 0 to this bit. If you want the McBSP to notify the CPU of receive frame–synchronization
errors, you can set the legacy mode receive interrupt with the SPCR1_REG[5:4] register RINTM bits.
When RINTM = 11b, the McBSP sends a receive interrupt (legacy mode RINT) request to the CPU
each time that RSYNCERR is set.
11.2.3.2.2 Example of an Unexpected Receive Frame-Sync Pulse
shows an unexpected receive frame–synchronization pulse during normal operation of the
serial port, with time intervals between data packets.
Note that the unexpected receive frame–synchronization pulse does not influence the data receive
process, being ignored by the data receive state machine.
Figure 11-15. Unexpected Frame-Sync Pulse During a McBSP Reception
1140
Multichannel Buffered Serial Port (McBSP)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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