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AR# 4304

FPGA Express - Express reports that "Export of Chip Failed" or similar message when trying to export XNF netlist


Keywords: FPGA Express, export, netlist, chip, failed

Urgency: Standard

General Description:
FPGA Express may generate an error when the user attempts to export an XNF netlist. The error is typically of the form:

"Export of chip failed"

or some similar message.


You should first check the warning messages that FPGA Express has generated. Many warning messages can be safely ignored, but FPGA Express will occasionally report warnings that do not allow the exportation of the netlist.

However, you may notice that an XNF file is generated. If the warnings referred to design errors, then the file might not be implementable in M1. You should first correct the items cited in the warnings, then export the netlist.

However, FPGA Express will occasionally report that a netlist could not be exported, but will not issue any notable warning messages. In this case, the XNF file should exist and be of legal netlist format. The error message that FPGA Express produces regarding an inability to export the netlist is caused by a problem in the cleanup process, when the netlist is written. In most cases, the error message can be safely ignored, and the XNF file is valid.

These issues are due to a variety of sources, and they are fixed in the incremental releases built by Synopsys. Please see (Xilinx Answer 3566) to upgrade to the latest available version of FPGA Express. If the latest FPGA Express version still exhibits the problem, then Synopsys would like to see your design so they can fix it; please contact the Xilinx Customer support hotline at 1-800-255-7778, and send in the design, if possible.
AR# 4304
Date Created 07/22/1998
Last Updated 08/11/2003
Status Archive
Type General Article