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AR# 22216

7.1 Virtex-4 MAP - "WARNING:PhysDesignRules:729 - Useless IOBDELAY_VALUE set"

Description

General Description: 

When running 7.1i MAP for a design containing Virtex-4 IDELAY, I receive the following warning message: 

 

WARNING:PhysDesignRules:729 - Useless IOBDELAY_VALUE set. Comp CLK1_IDELAY_O/CLK1_IDELAY_INST is using the Delaychain with a delay type DEFAULT but the IOBDELAY_VALUE is set. This value will be ignored and the default value will be used. 

 

What does this mean?

Solution

This DRC issue will be fixed in version 8.2i so that no warning message will be printed for the default value of 0. Meanwhile, the message can be safely ignored. The default value of 0 will be used.

AR# 22216
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article