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AR# 11478

3.1i Virtex PAR - Cost table results for MPPR and non-MPPR do not match.


Keywords: MPPR, Multi-Pass, -n, cost, table, different, results, match

Urgency: Standard

General Description:
Cases have been seen where MPPR and non MPPR PAR runs do not give identical results. This should not happen if the software environment, PAR options, and input files are the same, as the PAR algorithms are deterministic. Similar problems have been discovered and fixed in the past.

NOTE: This issue affects the Virtex, Virtex-E and Spartan-II device architectures.


This problem is fixed in the latest 3.1i Service Pack, available at:
The first service pack containing the fix is 3.1i Service Pack 8.
AR# 11478
Date Created 08/29/2007
Last Updated 10/22/2008
Status Archive
Type General Article