AR# 32479

11.1 PlanAhead - A Spartan-3E GCLK placement is unnecessarily inflexible

描述

When I place a GCLK pin, the BUFG associated with it is automatically placed as well. Each GCLK pin can drive two BUFG sites, so there is more than one valid placement for this BUFG. This is unnecessarily limiting.

解决方案

This issue is scheduled to be fixed in a future software release.

In the current software, if it is necessary to use the other BUFG, the constraints must be modified manually.

AR# 32479
日期 12/15/2012
状态 Archive
Type 综合文章