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# 31640

10.1 CORE Generator - COE files for CAM Core do not currently support "X" or "U" characters


The CAM Core does not allow the use of "X" or "U" characters in the COE file.


This feature will be added starting with Service Pack 3 in ISE 10.1.

With the enhancement, you can enter "X" or "U" characters in COE files for radix=2 and radix=16.

When an X or U is found in the COE file for radix=16, it will be translated to all 4 "X" or "U" in the mif file.

For example:

If "1X" is in COE file, this should be translated to "0001XXXX" in the MIF file.

If you want to use this feature with the CAM Core in CORE Generator, update to the latest 10.1 Service Pack available at:


The first service pack containing the fix is 10.1 Service Pack 3.
AR# 31640
Date Created 09/12/2008
Last Updated 07/29/2010
Status Archive
Type General Article