open-source-silicon.dev

Let's say I have a picorv32 cpu already hardened. It has a wishbone bus. Now I write a peripheral and harden that. How do I put those blocks together and get them wired up?

Or I have some extra memory from openram, how does that wiring happen?

you use them as macro in your top level design (basically black boxes).

AFAIU This is currently not fully implemented in the flow.

(although really for your picorv + peripheral, you would just synthesize both at the same time ...)

It's for this aggregation idea I have. I want to put lots of smaller designs together. So they will all be macros with some common connections

I suppose it must be planned tho because otherwise how would you use a tool like openram? Or wire it up manually in magic...

yeah, it's planned and you can see the beginning of the implementation of it in the flow, but it was not fully functionnal.  There was an example with a macro in `rc1` but it's been removed because it wasn't running in the current flow.