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AR# 9543

3.4 FPGA Express - FPGA Express writes the IOB attribute on every flip-flop in a Virtex design

Description

Keywords: IOB, true, false, Virtex, flip, flop, ff, map

Urgency: Standard

General Description:
FPGA Express will write out an IOB attribute on every flip-flop in a Virtex
design. This causes the 'map -pr' option to be obsolete.

解决方案

Change the IOB attribute setting to either TRUE or FALSE in the FPGA Express
constraints editor. The UCF will also override this particular constraint.

If you want no attribute to be placed on the flip-flop, the only known
workaround is to manually edit the EDIF file to remove the IOB attributes.
AR# 9543
创建日期 06/21/2000
Last Updated 08/30/2001
状态 Archive
Type 综合文章