If IDLE2 is used, truncated clock compensation sequence can cause an unexpected PNA to be sent by the core due to data following the truncated clock compensation sequence not being descrambled correctly.
This is a known issue to be fixed in the next release of the core.
For the fix in v1.7 of the core, install Rev1 patch for this core available in (Xilinx Answer 55736).
For the v2.0 core, install Rev1 patch available in (Xilinx Answer 55737).
Note: "Version Found" refers to the version where the problem was first discovered. The problem might also exist in earlier versions, but no specific testing has been performed to verify earlier versions.
05/02/2013 - Initial release