Apple to Move a Part of Its Embedded Cores to RISC-V

• phison

  1 0 10.0 C

  Phison PS2303 (PS2251-03) framework

Here's one with a 250MHz 8051: https://github.com/flowswitch/phison/wiki/PS2303

They don't need anything as powerful as ARM (and thus avoid the licensing fees), and it's a very price-sensitive market, so a fast 8051 + accelerator hardware is enough.

No doubt some of the more expensive ones may be ARM-based, but I think the 8051-based ones far outsell them in volume.

• picorv32

  15 2,770 5.2 Verilog

  PicoRV32 - A Size-Optimized RISC-V CPU

  

That is, reducing the number of LUT required to implement a CPU of a given ISA.

A basic RV32 CPU is down to 500-700 LUT.

    https://github.com/YosysHQ/picorv32

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• serv

  19 1,244 7.7 Verilog

  SERV - The SErial RISC-V CPU

https://github.com/olofk/serv

• Projects

  7 349 5.2 C++

  Ted Fried's MicroCore Labs Projects which include microsequencer-based FPGA cores and emulators for the 8088, 8086, 8051, 6502, 68000, Z80, Risc-V, and also Typewriter and EPROM Emulator projects. MCL51, MCL64, MCL65, MCL65+, MCL68, MCL86, MCL86+, MCL86jr, MCLR5, MCLZ8 (by MicroCoreLabs)

There is a difference, but not much!

    https://github.com/MicroCoreLabs/Projects/tree/master/MCL51

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