Rocket Chip Generator (https://github.com/freechipsproject/rocket-chip)
2f70136f90
There's a register that tracks what word within a Nasti transaction a Smi response cooresponds to, since Smi itself doesn't have any multi-word stuff. This breaks the single-word Nasti to Smi converter due to what's essentially a 0-width wire bug: it ends up doing something like word_offset_into_nasti := nasti_address(3, 3) when "word_offset_into_nasti" should really be a 0-bit register, but due to some log2Up block size calculation logic it's actually a 1-bit register. Thus, this expression ends up grabbing a bit of the address, which causes odd addresses to get buffered incorrectly. My fix is to just special-case the "Nasti bus width is the same as Smi bus width" case. |
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