Adding recommendation for connecting multiple coprocessors

openhwgroup / core-v-xif

RISC-V eXtension interface that provides a generalized framework suitable to implement custom coprocessors and ISA extensions

https://docs.openhwgroup.org/projects/openhw-group-core-v-xif/en

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Adding recommendation for connecting multiple coprocessors #195

Closed christian-herber-nxp closed 6 months ago

christian-herber-nxp commented 6 months ago

requiring compressed_resp.instr to be 0 if rejected
requiring result to be 0 when not providing a result to the CPU

christian-herber-nxp commented 6 months ago

@mpezzin @Silabs-ArjanB Please give this a solid check. Besides the non-normative addition to the appendix, I did make two small changes to the spec itself. I assume change on the compressed interface was an oversight, as this is well in line with issue. But I think the requirement on result is also important, as this helps to prevent big multiplexers.