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AR# 15055

Virtex-II Pro RocketIO - What are the "Automatic lock-to-reference functions"?


What are the "Automatic lock-to-reference functions"?


The plurality of "functions" is a bit misleading, as there is really only one lock-to-reference function. If there are no transitions on the RXP and RXN inputs, RXRECCLK will lock to REFCLK. Since the CDR's PLL can withstand 75 non-transitioning bits, this will not happen until that number has been exceeded.

AR# 15055
Date Created 09/03/2007
Last Updated 05/14/2014
Status Archive
Type General Article