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AR# 19073

7.1i Timing - Virtex-II Pro speeds file (1.85) reports an incorrect negative value for Tiosrp (-1 ps)

Description

Keywords: 1.85, negative, Tiosrp, fast path, Pro

Urgency: Standard

General Description:
When analyzing my design, I turn on the Fast Path analysis. When I look at the timing report for the "Slowest Paths", I see a Tiosrp value of 3678 ps. However, for the same path under the "Fastest Paths", I see a Tiosrp value of -1 ps. How can a propagation delay be negative?

Solution

The above number is invalid for the prorated version of Tiosrp in the speed files.

This problem will be fixed in a future release of the software.
AR# 19073
Date Created 03/02/2004
Last Updated 03/29/2007
Status Archive
Type General Article