A FRAME_ECC error occurs immediately after configuration if the user design instantiates a DCM. This can affect all Virtex-5 devices.
Attached to the end of this answer record is a patch for ISE Design Suite 11.3. Extract the contents of the ZIP file to the <install>/11.1/ISE directory.
This patch is for all operating systems: Win32, Win64, Lin32, Lin64.
The issue is resolved in the 12.2 release of the tools.
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