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AR# 14586

4.2isp2 Timing Analyzer - The timing report contains an incorrect cycle time for a 95144XL

Description

General Description:

The timing report produced by CPLDFit reports the cycle time for a clock net as "x" ns. When I run "Analyze Against Auto Generated Design Constraints" from Timing Analyzer, the Timing Analyzer reports a cycle time of "y" ns.

Which report is correct?

Solution

The timing report is correct. (It appears that Tpta was not accounted for in the Timing Analyzer results.)

This issue was fixed in the 5.1i software release.

NOTE: Cycle-to-cycle = (Tcoi + Tf + Tlogi + Tsui + Tpta)

AR# 14586
Date Created 08/29/2007
Last Updated 01/18/2010
Status Archive
Type General Article