Handle ERR in toWishbone

[martijnbastiaan]

This PR implements handling ERR in toWishbone.

Note that the following may look strange:

  cmdBridge.ready := cmdBridge.valid && (bus.ACK || bus.ERR)

But this is imposed by the Wishbone spec:

Rule 3.45
If a SLAVE supports the [ERR_O] or [RTY_O] signals, then the SLAVE MUST NOT assert more than one of the following signals at any time: [ACK_O], [ERR_O] or [RTY_O].

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Questions for reviewers:

• Is there an example regression test for, say, AXI error handling I could use as a base for a Wishbone test?
• Where can I add a changelog entry (if applicable)?

[Dolu1990]

Hi,

Thanks for the fix ^^

Is there an example regression test for, say, AXI error handling I could use as a base for a Wishbone test?

So the issue is that those bridges are more used inside SoC, and tested at a SoC level. There is no proper test for it in VexRIscv repo. Not great.

Where can I add a changelog entry (if applicable)?

So far, the git commits are the logs

Note that i'm now working on VexiiRiscv : https://github.com/SpinalHDL/VexiiRiscv
Aiming for the mooooooon XD

Cheers
Charles

[martijnbastiaan]

Thanks for the merge!

Note that i'm now working on VexiiRiscv : https://github.com/SpinalHDL/VexiiRiscv

Good luck!!