SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The CPRMII transmit (TX) interface converts the GMAC_SW MII input data into the RMII transmit format. The data is then output to the external RMII PHY.
The GMAC_SW does not source the transmit error (MII TXERR) signal. Any transmit frame from the CPGMAC with an error (underrun) will be indicated as an error by an error CRC. Transmit error is assumed to be de-asserted at all times and is not an input into the CPRMII module. Zeroes are output on RMTXD[1:0] for each clock that RMTXEN is de-asserted.