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AR# 15670

Virtex-II Pro RocketIO - The RXCOMMADET output stays High for multiple cycles

Description

Why does the RXCOMMADET output stay High for multiple cycles?

Solution

The RXCOMMADET and RXREALIGN outputs are originally generated in the RXRECCLK domain and are then re-synchronized to the RXUSRCLK2 domain. To ensure that asserted values are reliably brought out to the fabric regardless of data path width, relative clock phase, and frequencies, the pulse will be stretched and may stay High for multiple cycles.

AR# 15670
Date Created 09/03/2007
Last Updated 05/14/2014
Status Archive
Type General Article