MegaWizard-generated memory with Nios II

I will try to be more specific (maybe this will help to come up with alternative solutions).

I need to make the on-chip memory (the only memory I have) protected with parity check. Say, if the memory is 32 bit then on every write access I want to write 33 bit word consisting of data and parity. And on every read access to calculate parity again and to compare it with the parity bit.

I have easily build the memory I need with MegaWizard, and made some wrapper blocks for parity check on read and write, now I don't know how to make so that my Nios II system use this memory.