This issue only affects implementation and timing closure; you can still simulate 512 byte MPS.
Constraints will be added to the UCF file in 11.3 to help in timing closure.
For other Virtex-6 Integrated Block Wrapper v1.2 for PCI Express Known Issues and Release Notes, see
(Xilinx Answer 32742).
Revision History 06/24/2009 - Initial Release