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AR# 22526

8.2i NetGen, Timing Simulation - Why do I receive false setup and hold checks in the ISERDES when my IOBDELAY_VALUE is non-zero?

Description

Keywords: X_ISERDES, ModelSim, NC-Sim, NCSIM, VCS, back annotation, 8.1i, 7.1i

Why do I receive setup and hold errors when I change the IOBDELAY_VALUE to a non-zero value?

Solution

This is a known issue in NetGen. When the value for IOBDELAY_VALUE is not zero (default), the checks performed for setup and hold are incorrect.

This issue is fixed in ISE 9.1i.
AR# 22526
Date Created 09/04/2007
Last Updated 11/17/2008
Status Archive
Type General Article