Comments (1)
GregAC
commented on July 19, 2024
The protocol is documented here: https://ibex-core.readthedocs.io/en/latest/03_reference/load_store_unit.html#protocol
It is effectively custom, though it came to us from the PULP project and in turn that has gone to the OpenHW group who have produced the Open Bus Interface: https://github.com/openhwgroup/obi/blob/072d9173c1f2d79471d6f2a10eae59ee387d4c6f/OBI-v1.6.0.pdf
However last I checked our protocol isn't quite OBI compatible, in particular it's got rules about feedthroughs that we violate (The valid input from the data memory response is combinationally connected to the valid output from the data memory request)
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