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AR# 14695

4.1i Virtex-II MAP - FDDRRSE are not packed into IOBs, and logic becomes corrupted

Description

Keywords: FDDRRSE, pack, place, MUXCY, CYMUX

Urgency: Standard

General Description:
A case has been seen where FDDRRSE registers are not handled correctly by MAP when they are driven by MUXCY symbols. Rather than being packed into the IOB, one register is packed into the same slice as the MUXCY, and the other is lost.

Solution

There is no known work-around for this issue, but this problem is fixed in the latest 4.2i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates
The first service pack containing the fix is 4.2i Service Pack 3.
AR# 14695
Date Created 05/16/2002
Last Updated 08/20/2003
Status Archive
Type General Article