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AR# 20986

6.3isp3 Timing Analyzer - Rounding errors result in large negative slack values for timing paths

Description

General Description:

When a CLKFX pin of a DCM is the result of dividing the orginal value by 0.66667 (or other repeating value), the timing tools round half of the number down and the other half up. This produces a very small requirement and a very large negative slack value. When is this going to be fixed?

Solution

This problem has been fixed in the latest 7.1i Service Pack available at:

http://support.xilinx.com/xlnx/xil_sw_updates_home.jsp
The first service pack containing the fix is 7.1i Service Pack 1.

AR# 20986
Date Created 09/04/2007
Last Updated 01/18/2010
Status Archive
Type General Article