Here are some tips on getting the DDR2 RAM working on the Digilent Atlys board.

* [http://tristesse.org/XilinxMIGTutorial Tutorial]
* [http://forums.xilinx.com/t5/3rd-Party-Other-Boards-and-Kits/Digilent-Atlys-board/td-p/122416 Xilinx forum]