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AR# 13877

*Obsolete* 4.1i Virtex-II/Pro - Virtex-II/Pro IFFs must both either be latches or be FFs


Keywords: Virtex-II, Virtex-II Pro, Design Rules Checker, DRC, IFF, latch, IOB

Urgency: Standard

General Description:
There are two input FF/latches in the IOB. However, there is only one configuration bit that makes the IFF1 and IFF2 either FFs or latches.

If they are configured differently, the DRC does not currently report an error, but they will not perform correctly on the chip.


This will be fixed in the next major release of the software.
AR# 13877
Date Created 08/29/2007
Last Updated 09/26/2005
Status Archive