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  3. AR# 8490: 2.1i Virtex Map - Inversion between MUXCY and Flop is dropped/

AR# 8490

2.1i Virtex Map - Inversion between MUXCY and Flop is dropped/

Description

Keywords: Inversion, Inverted, Carry, MUXCY, Flop, Register

Urgency: Standard

General Description:
A case has been seen where an inversion was being dropped
between a MUXCY and a Flop in the same slice. The mapper
attempted to use the XORCY to implement the inversion, but
incorrectly drove the other pin with a "0" instead of a "1".

Solution

This change is available in the latest 2.1i Service Pack available at:
http://support.xilinx.com/support/techsup/sw_updates/
AR# 8490
Date 07/20/2001
Status Archive
Type General Article
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