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AR# 12019

4.1i Timing/Constraint - Select line to BUFGMUX will not be covered with offset constraint

Description

General Description:

When I place an OFFSET IN for the select line of a BUFGMUX, the setup time is ignored. How can I get around the OFFSET IN constraint that is not working on the select pin of the BUFTGMUX?

Solution

A FROM:TO constraint should be used instead.

Alternatively, the select line can be driven by a flip-flop or another synchronous element, placing the select line setup time into a PERIOD analysis.

AR# 12019
Date Created 08/29/2007
Last Updated 01/18/2010
Status Archive
Type General Article