DDR2 controller help

Hi,

I am following the example "Using the SDRAM on Altera’s DE2 Board with Verilog Designs" using Qsys.

I have built the system and loaded it on the FPGA but I don't see any example on how to test that the RAM controller is working. It only shows how to test the switches and LEDs.

How can I write data to a specific RAM address and read it back to see if it is correct? How exactly does it work? If anyone knows more , It would be very helpful.

Thanks,

Paul