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Re:Berkeley Out-of-Order RISC-V Processor (Boom) (2020) by rwmj on Wednesday October 29, 2025 @11:40AM (#45748322)
Rocket-chip is widely used (https://github.com/chipsalliance/rocket-chip). It can fit on smaller FPGAs.

If you want something very tiny and completely understandable, and don't mind that it's 32 bit, then PicoRV32 (https://github.com/YosysHQ/picorv32).

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