What are the TX/RXCRCSAMECLOCK attributes in the V-4 MGT CRC block?
TX/RXCRCSAMECLOCK attributes select the clock source for TX/RXCRCCLK respectively.
TX/RXCRCSAMECLOCK =TRUE makes the internal CRCCLK the same as the CRC fabric interface clock (TX/RXCRCCLK = TX/RXCRCINTCLK). TX/RXCRCCLK need not be provided in this case. Typically, they are used when both clock frequencies are the same (TX/RXCRCCLOCKDOUBLE = FALSE).
TX/RXCRCSAMECLOCK =FALSE makes the internal CRCCLK the same as the CRCCLK at the input of the CRC Block. Typically, this is used when the TX/RXCRCCLK is 2x the frequency of TX/RXCRCINTCLK (TX/RXCRCCLOCKDOUBLE = TRUE).