Custom Instruction

Ok, BadOmen:

I've a multiple Nios II architecture inside a single Stratix.

I'd like to add a 1 bit input and a 1 bit output (some sort of /req and /ack) to each Nios II to interface a custom hardware.

Is it possible to built this hardware inside the Stratix chip? How can I do that?

Then I need also the custom instruction... => this is why I was speaking about "external interface custom instruction" (see "NiosII Custom Instruction User Guide; chapter 1, page 12)

Bye!