We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 60449

XST - Synthesis fails with message "Process Synthesis failed" in ISE GUI but no other error indicating the reason


When I run XST from Project Navigator, The following error is received: "Process Synthesis failed".

There is no other error message in the Synthesis report.

How can this issue be resolved?


The message "Process Synthesis Failed" is generated by Project Navigator in the event of an error code being returned.

If XST is not issuing any messages with the reason, the following are possible solutions:


  • "Cleanup Project Files" and remove the _xdb folder.
  • Re-create the project.
  • Try running ISE 32bit.
  • Run XST command line using the information in the Command Line Log File (.cmd_log) in the project directory.
  • If there are IP cores or NGC/EDIF netlists used in the project, try disabling the "-read_cores" option in XST Process Properties. 
  • If an NGC netlist is actually generated from XST in the project directory, you can create another project for Implementation with this NGC as top level and the UCF file(s).
    Alternatively you can right click Synthesis - XST , force process up-to-date, then continue to run implementation.
  • There is a known issue where the license checking of a Xylon IP causes XST crashes in ISE 14.6 and 14.7.
    A patch to resolve this issue is provided in (Xilinx Answer 59851)


If none of the above solutions help, please refer to (Xilinx Answer 40377)

The debug steps for XST internal/fatal errors can also be used for this issue.

For more information on running XST command line and XST options, please refer to UG687.



Answer Number 问答标题 问题版本 已解决问题的版本
40377 Design Assistant for XST - Resolving fatal errors, internal errors, out of memory issues, and hanging issues N/A N/A
AR# 60449
日期 07/30/2014
状态 Active
Type 综合文章
器件 More Less