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4.1i Timing Analyzer/TRCE (Trace) - The unconstrained path report contains constrained paths
A number of paths that are covered by constraints appear when I produce an unconstrained path report. Which report is correct?
If constrained paths appear in the unconstrained path report, this is simply a reporting error -- the PAR analysis is working successfully.
If a path appears under a constraint, that path is already covered and may be safely ignored in the unconstrained path report.
For more information, please also see (Xilinx Answer 6447).