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AR# 22559

8.1i ISE - When simulating an XPS design, the top level system_stub.v(hd) source disappears from Sources window


When running a ModelSim simulation process on an XPS design, the system_stub.v disappears from the Sources window. It cannot be added again because it is still part of the project.


The script associated with ModelSim processes is incorrectly overwriting the system_stub file. This causes a disconnect with the Project Navigator sources reference and the file is removed from the sources view.

This issue is fixed in the latest 8.1i Service Pack, available at:

The first service pack containing the fix is 8.1i Service Pack 1.
AR# 22559
Date Created 09/04/2007
Last Updated 04/12/2012
Status Archive
Type General Article