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AR# 32715

11.1 Timing - Why do I see analysis performed on the incorrect clock edge?

Description

I am using a DCM to generate negative phase adjustments, and I see timing analysis performed on the incorrect clock edge. 

 

How can I correct this issue?

Solution

This is a known issue and is expected to be fixed in the next major release of software. 

 

The problem is related to the PERIOD constraint translation through the DCM. 

 

A work-around is to add a related PERIOD constraint to the output of the DCM that has the appropriate phase shift associated with the correct OFFSET IN/OUT with RISING / FALLING keyword.

AR# 32715
Date Created 06/10/2009
Last Updated 05/21/2014
Status Archive
Type General Article