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AR# 18768

Virtex-II Pro RocketIO - What is the maximum cycle-cycle change in RXRECCLK during phase capture?

Description

When the RocketIO transceiver is re-capturing the phase of a serial stream, how fast will the RERECCLK period change?

Solution

RXRECCLK will change by a maximum of 1/16 of a serial line bit period, once every 8 RXRECCLK cycles. Thus, a 3.125 Gb/s stream will see its RXRECCLK change by a maximum of 320ps/period * 1/16 = 20ps, between two adjacent RXRECCLK cycles. Note that this number is only due to the effects of phase alignment.

AR# 18768
Date Created 09/03/2007
Last Updated 05/16/2014
Status Archive
Type General Article