How to Initialize Multiple Instanses of on chip mem in SoPC

Mega-wizard generated blocks are fairly inflexible for things like that, you're stuck with however you set it up in the wizard.

You can probably do as you describe, but then you wont be able to modify it again in the megawizard and you will have to put your own wrapper around a normal instantiation.

Personally, I avoid using the megawizard whenever possible because it just generates a load of files you dont really need and makes it all infexible.