SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
A transmit DATA port error, as indicated by the XDMAERR flag in the MCASP_TXSTAT register, occurs when the DMA or device CPU writes more words to the DATA port of the McASP than it should.
The MCASP_TXSTAT[7] XDMAERR=0b1 indicates that the DMA or device CPU wrote too many words to the McASP DATA port for a given transmit DMA event. Writing too few words results in a transmit underrun error setting XUNDRN in MCASP_TXSTAT.
While XDMAERR occurs infrequently, an occurrence indicates a serious loss of synchronization between the McASP and the DMA or device CPU. The McASP transmitter and the DMA must be reinitialized to resynchronize them.