SSRAM (IS61LPS25636A)) on Cyclone III starter board

Don't worry, it wasn't too much trouble ;)

I just realized I didn't pack the project properly, and the design files are missing. Here is the bdf I modified, if you just replace yours with this one and assign ssramclk to pin A2 it should work. But you managed to make it work anyway so I guess you don't need it ;)

As for your write problem, it may come from the fact that you are sometimes putting the D register to high impedance ('Z') while bwe_n is still 0. On that clock cycle, the SSRAM can really write anything.

You should modify your code, either to invalidate the write operation when the D register is all Z's, or have one write per clock cycle (the ssram clock).