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AR# 17017

5.2i iMPACT - The XC2S150E/200E appears as an "Unknown Device" when I attempt an "Initialize Chain" operation


General Description:

In 5.2i iMPACT, when I perform an "Initialize Chain" operation on a JTAG chain that contains a XC2S200E or XC2S150E device, the XC2S200E or XC2S150E appears as an unknown device, and the following message occurs:

"Identifying chain contents ....

The part does not appear to be Xilinx Part.

INFO:iMPACT:501 - '1': Added Device UNKNOWN successfully."


This problem does not prevent you from performing any JTAG operations on the device.

To proceed, you can assign the unknown device the appropriate ".bit" file, and then perform any Program, IDCODE, or Verify operation as usual.

This problem is fixed for the XC2S200E in the latest 5.2i Service Pack, available at:


The first service pack containing the fix is 5.2i Service Pack 3.

This problem is fixed for the XC2S150E in the 6.1i design tools release.
AR# 17017
Date Created 09/03/2007
Last Updated 07/26/2011
Status Archive
Type General Article