Data storage in DE2-115

Hi,

I have two signals that are to be compared. One of the signal would be real time which will be sent in through one of the input ports. I intended to store the other signal in the evaluation board itself or other memory devices that can be connected to the board.

Please suggest me a way in which data can be stored and also accessed form the inbuilt memory in the board or through other memory devices that can be connected to the board.