2. 技术支持
  3. AR# 6383: 4.1i Constraints Editor - The definition "TIMESPEC TSxx = FROM(abc) TO(xyz)" generates the warning: "Unable to create FROM TO with tsxx."

AR# 6383

4.1i Constraints Editor - The definition "TIMESPEC TSxx = FROM(abc) TO(xyz)" generates the warning: "Unable to create FROM TO with tsxx."

描述

General Description:

The following timespec definition is not understood by Constraints Editor:

timespec ts05 = from pads(pclk) to ffs = 6 ns;

The following warning is generated:

WARNING: Unable to create FROM TO with ts05.

解决方案

The warning can either be ignored, or you can modify the UCF file to include the timegrp, and then the timespec.

For example:

timegrp pad_pclk = pads(pclk);

timespec ts05 = from pad_pclk to ffs = 6ns;

This is fixed in the 4.1i software release.

AR# 6383
日期 01/18/2010
状态 Archive
Type 综合文章