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AR# 15204

5.1i iMPACT - "ERROR:iMPACT:638 - Command Line Error: only .bit/.rbt/.mcs/.exo file allowed for serial mode"


General Description:

ISE Project Navigator has the ability to launch iMPACT in batch mode to configure via slave serial or SelectMAP mode. However, iMPACT reports an error message similar to the following:

"ERROR:iMPACT:638 - Command Line Error: only .bit/.rbt/.mcs/.exo file allowed for serial mode."


This problem is fixed in the latest 5.1i Service Pack, available at:


The first service pack containing the fix is 5.1i Service Pack 1.

AR# 15204
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article