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KireinaHoro avatar KireinaHoro commented on June 14, 2024

I think in practice RAM like this would be possible to infer by the EDA tool, so there's not a strict need to blackbox this case. I'm currently using the blackbox flow to make sure I don't accidentally create RAM that could not be inferred by Vivado; do we have some sort of checks for this purpose?

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Dolu1990 avatar Dolu1990 commented on June 14, 2024

should be able to be blackboxed into a Ram_2wrs

But shoudnl't as the idea is to be very accurate about what it is (Ram_1r_1wrs which doesn't exists)

I think in practice RAM like this would be possible to infer by the EDA tool,

Ahh on the big vendors yes, but on smaller things / darker place, things can break very easily
For vivado, i only use blackboxing when using byte enable or multiple write ports

do we have some sort of checks for this purpose?

See https://github.com/SpinalHDL/VexiiRiscv/blob/litex/src/main/scala/vexiiriscv/soc/litex/Soc.scala#L295 for instance only ask blackboxing on byte enable rams

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