Creating external SRAM pin assignment?

1. First, create a mockup top level file with all the signals your FPGA will need: the SRAM signals you described, etc, etc.

2. Then compile the design and fire up the Pin Assignment Editor in order to assign the signals to actual FPGA pins and specify the I/O standard.

Finaly, in order to make sure you have a viable pin assignment, do two things:

a) read the pin assignment guidelines

b) compile your design to see if there are no errors

c) open the .pin file Quartus has produced and make sure the connections in your PCB match the contents of that file

Never, ever, ever, sign of a PCB for manufacturing before at least doing these three steps!!!

Rinse and repeat until you're happy. You'll proably will be changing the pin assignment as you design the PCB in order to make the routing easier.

Some (most) EDA tools offer some support to help you with this.