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Altera_Forum
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12 years ago

Getting Nios to talk to on chip logic

Total newbie question but what is the best way to get Nios to talk to custom on chip logic ? I'm setting up a special counter in logic that I'd like to have Nios control and read. Do I need to set up...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

You need to access the logic via the avalon bus.

I think you can use a generic 'pio' interface, but writing a avalon slave isn't that hard and will give greater flexibility (and probably remove some clock delays).

Do make sure you generate a 32bit slave - even if you ignore the high bytes.

Also the nios always asserts all 4 byte enables on reads.