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AR# 31777

10.1 Constraints - Do the Virtex-4 and Virtex-5 architectures support IBUF_DELAY_VALUE?

Description

The Constraints Guide states the following. Is it correct? 

 

The IBUF_DELAY_VALUE constraint applies to the following devices: 

Virtex-4 

Virtex-5 

Spartan-3A 

Spartan-3E

Solution

The IBUF_DELAY_VALUE is not used or applicable to Virtex-4 or Virtex-5 architectures; therefore, it is not a supported attribute.

AR# 31777
Date Created 11/07/2008
Last Updated 05/23/2014
Status Archive
Type General Article