Xilinx ISE 14.7 or Vivado Synthesis Hangs on Windows 11

Issue Details

Compiling FPGA designs with Xilinx ISE 14.7 or VIvado on Windows 11 may hang indefinitely during the "Synthesize" step due to the libPortability.dll library attempting to enumerate network shares, which can fail silently on Windows 11.

Solution

The issue was resolved by applying a known patch for Xilinx ISE 14.7 or Vivado. The file xilinx-ise-win10-hang-hotfix.zip, although originally named for Windows 10, has been verified to work on both Windows 10 and Windows 11 systems.

Download the  xilinx-ise-win10-hang-hotfix.zip attached in this page, then replace libPortability.dll file in the following directories with the file in the zip:

ISE

• C:\Xilinx\14.7\ISE_DS\ISE\lib\nt64\libPortability.dll
• C:\Xilinx\14.7\ISE_DS\common\lib\nt64\libPortability.dll

Vivado

• C:\NIFPGA\programs\Vivado[version]\ids_lite\ISE\lib\nt64\libPortability.dll

Following the replacement, the PC was restarted to ensure the new libraries were loaded. This successfully resolved the synthesis hang issue, and the FPGA compilation completed without further problems.