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AR# 13805

4.2isp1 XST - The GUI option for merging flip-flops into the IOBs does not appear to work as it did in the 4.1i software


Keywords: XST, IOB, flip-flop, merge, duplicate, register, 4.1i

Urgency: Standard

General Description:
When I set the GUI option to merge the flip-flops into the IOBs for the XST tool, the registers to not seem to be pushed into the IOBs as they were in an older XST version. Additionally, the registers are not duplicated, even though the GUI option to duplicate registers is checked.


This issue will be fixed in the 5.1i software, which is scheduled to be released in September, 2002.
AR# 13805
Date Created 02/07/2002
Last Updated 08/06/2003
Status Archive
Type General Article