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AR# 21269

7.1i Virtex-II PRO MAP - Directed Routing constraints block trimming of loadless/driverless nets

Description

General Description: 

A functional change was made 7.1i MAP to automatically apply a "KEEP" constraint on nets with Directed Routing constraints, to prevent them from being merged into logic. MAP was also incorrectly changed to also apply an "S" property to these nets, which prevents them from being trimmed when needed. The result is that a design might have loadless or driverless nets, which will lead to a DRC error during BitGen.

Solution

This problem has been fixed in the latest 7.1i Service Pack available at: 

http://support.xilinx.com/xlnx/xil_sw_updates_home.jsp
The first service pack containing the fix is 7.1i Service Pack 2.

AR# 21269
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article