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AR# 12171

4.1i Trace (TRCE)/Timing Analyzer - Percent coverage has decreased from previous software versions. Why?

Description

General Description:

When I perform static timing analysis in 4.1i, the percent coverage seems to have decreased from previous software versions. Why?

Solution

In 4.1i, paths crossing between flip-flops clocked by unrelated clocks are no longer covered in the PERIOD constraint. Thus, the coverage has gone down, as these paths are no longer covered. A FROM TO or a relational PERIOD constraint is now necessary to analyze these paths.

Please see (Xilinx Answer 11850) for more information.

AR# 12171
Date Created 08/29/2007
Last Updated 01/18/2010
Status Archive
Type General Article