SDRAM signals managing

OK, what I have to do is to look at 4 signals (connected as the board GPIOs), store them somewhere then analyse it to tell what happens.

What I wanted to do is to store it in the internal FPGA RAM (it's easy) but lately it appeared the memory was to small and I decided to use the board SDRAM instead. But the mechanism of the SDRAM is too complicated for me so maybe I'll use a serial connection trough the USB to store it on the PC and analyse it with a simple software instead of an embedded one.

I'm listening for your advices in the matter...