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AR# 29456

9.2i Timing Analyzer - ERROR: TRACE output file "xrefdes.twr" not found!


When I open the Post-Place & Route Static Timing report in ISE, the process claims to be successful, but there is no "twr" file generated.

Started : "Generate Post-Place & Route Static Timing".

PMSPEC -- Overriding Xilinx file <C:/xilinx/qvirtex2/data/qvirtex2.acd>

with local file <C:/xilinx/qvirtex2/data/qvirtex2.acd>

Loading device for application Rf_Device from file '2v6000.nph' in environment


"xrefdes" is an NCD, version 3.2, device xq2v6000, package mf957, speed -4i

The STEPPING level for this design is 1.

WARNING:TimingToolsC - Command "OpenPCF" failed

Number of warnings: 1

Total time: 6 secs

ERROR: TRACE output file "xrefdes.twr" not found !

Please check if this file is available in the project directory and re-run the process.

Process "Generate Post-Place & Route Static Timing" completed successfully

When is this going to be fixed?


The work-around is to change the device into a Industrial parts, use the TEMPERATURE constraint, and set it to 100.

This problem has been fixed in the latest 9.2i Service Pack available at:


The first service pack containing the fix is 9.2i Service Pack 4.

AR# 29456
Date Created 12/06/2007
Last Updated 01/18/2010
Status Archive
Type General Article