Why does the ML506 board not have the PHY interrupt pin connected?
This issue will be fixed in 11.2.
In the meantime, to work around the problem, uncomment line number 404 in:
C:\Xilinx\11.1\EDK\board\Xilinx\boards\Xilinx_Ml506\data\Xilinx_ML506_v2_2_0.xbd
This problem has been fixed in EDK 11.2, available at: