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AR# 20127

6.3i Timing Analyzer/TRACE - "WARNING:Timing:2751 - The clock refclk_buf has a period... is an invalid warning"


Urgency: Hot

General Description:

When I run my 10G Fibre Channel design that uses RocketIO, the timing tools report a false warning:

"WARNING:Timing:2751 - The clock refclk_buf has a period (frequency) specification of 6275 ps (159.36 Mhz). This violates the minimum period (maximum frequency) for component mgt_0_MGT of 6400 ps (156.25 Mhz)."

When is this going to be fixed?


This problem has been fixed in the latest 6.3i Service Pack available at:

The first service pack containing the fix is 6.3i Service Pack 2.

AR# 20127
Date 01/18/2010
Status Archive
Type General Article
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