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AR# 23747

9.1i Virtex-5 Timing Analyzer - Why are Q1 and Q2 paths analyzed on both edges?


When I open the timing analysis report, the Q1 and Q2 paths are analyzed on both edges. In opposite edge mode, the Q1 clock-to-out should only be analyzed with regards to the rising edge and the Q2 clock-to-out path should only be analyzed with regards to the falling edge. Why is this occurring?


The Q1 and Q2 paths should not be analyzed on both edges.

This problem has been fixed in the latest 9.1i Service Pack available at:

The first service pack containing the fix is 9.1i Service Pack 1.

AR# 23747
Date 01/18/2010
Status Archive
Type General Article
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