A problem with SSRAM on the DE2-70!

I have a problem when I use the ssram on the DE2-70 board.in sopc design, I

choose the Cypress CY7C1380C, and set up ssram size of 2M, in quartus, I use

the schematic input methods.when I configure the pins I found the sopc

generated module, the actual ssram module's pins are less than the pins in the

user manual including (oSRAM_ADSP_N, oSRAM_ADV_N, oSRAM_CE2, and oSRAM_CE3_N).

The block files can be complied and download to the DE2-70 board after I

configured the module's pins. I design a new nios2 application,and it can be

build successfully,but when you run" run as NIOS2 hardware", the program can

also run, but the results are wrong. what's the problem? and how to solve it?

Thank you!