SERV - The SErial RISC-V CPU
SERV has an RV32I ISA. It is really light. I am sure it will fit.
:computer: A damn small msp430-compatible customizable soft-core microcontroller-like processor system written in platform-independent VHDL.
If you insist on 16-bit you could check out the neo430
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A circuit simulator that doesn't look like it was made in 2003
5 projects | news.ycombinator.com | 14 Dec 2022
SUGGEST AN OPEN SOURCE RISC-V CORE DESIGNED IN VERILOG
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RISCV CPU using PL on Pynq Z2 Development Board
1 project | reddit.com/r/FPGA | 14 Nov 2022
How many LUT for an 8 bit CPU?
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Minimax: a Compressed-First, Microcoded RISC-V CPU
4 projects | reddit.com/r/FPGA | 26 Oct 2022