SRAM K1B3216B2E on Cyclone III Development Kit

I am not sure about which address you mean starts with a(1) rather than

a(0). You say the "peripheral", it sounds you mean sram address.

You need to discard 2 bits of nios avalon address bus i.e. connect nios avalon address line(2,3,...etc) to all of your sram address lines. But in your previous vhdl, you connect nios address lines(3,4,...etc) to sram and this is wrong.

I am not good at TCL. If you upload your nios entity, top project entity and your instantiation then I may be helpful

kaz