AR# 10865

3.1i Virtex PAR - The router has changed so that backbone resources are always used when the USELOWSKEWLINES constraint is assigned to a net.

描述

Keywords: USELOWSKEWLINES, skew, backbone, clock, constraint, router, routed, routes

Urgency: Standard

General Description:
In the past, the router would sometimes move nets off low-skew backbone resources in an attempt to meet timing constraints, even though the net was constrained to use these resources with the USELOWSKEWLINES constraint. This will no longer occur.

NOTE: This issue affects the Virtex, Virtex-E and Spartan-II device architectures.

解决方案

This change is available in the latest 3.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates.
The first service pack containing the change is 3.1i Service Pack 8.
AR# 10865
日期 10/21/2008
状态 Archive
Type 综合文章