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AR# 29355

10.1 Timing/Constraints - Support for hold time checking when using a FROM-TO constraint

Description

How do I enable hold time checking when using a FROM-TO constraint?

Solution

From ISE 9.2i and beyond, the FROM-TO constraint will perform hold analysis for Virtex-5 devices.

For all other devices, use the following to analyze hold paths on FROM:TO constraints in 9.1i and beyond:

setenv XIL_TIMING_HOLDCHECKING YES

AR# 29355
Date Created 03/24/2008
Last Updated 12/15/2012
Status Active
Type General Article