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AR# 20002

14.x Constraint - How do I set an OFFSET constraint depending on a clock period?

描述

How do I set an OFFSET constraint depending on a clock period, for example:

NET "clk20" TNM_NET = "clk20";
TIMESPEC "TS_clk20" = PERIOD "clk20" 20 ns HIGH 50 %;
OFFSET = IN TS_clk20*0.1 BEFORE clock;

解决方案

This feature is not supported for the OFFSET constraint. However, you can create a script to write the UCF file.
AR# 20002
日期 12/15/2012
状态 Active
Type 综合文章
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