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AR# 21355

Virtex-4 RocketIO - What are the TX/RXCRCSAMECLOCK attributes in the V-4 MGT CRC block?

Description

What are the TX/RXCRCSAMECLOCK attributes in the V-4 MGT CRC block?

Solution

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).

AR# 21355
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article