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64bit RISC5 is cheap & has significant advantages around address space, computational efficiency, and suitability for high-performance applications while being
by OrvalWintermute 1y ago
64bit RISC5 is cheap & has significant advantages around address space, computational efficiency, and suitability for high-performance applications while being more future-proof for complex systems.
It is cheap also, with the F133*, priced at approximately $1.00 to $1.50 per unit in bulk
If looking more for US stuff (fabbed in South Korea), PIC64GX1000 can be as little as $21 but much more capable.
- jecel 1y agoPlease note that RISC-V and RISC5 are different projects: https://riscv.org https://riscv.org https://riskfive.com https://riskfive.com Despite the name of the second site, the actual processor is called RISC5 (see the menu on the left) and is part of the Oberon project by Niklaus Wirth.
- mk_stjames 1y agoI think the point of this project hinges on putting the CPU arch down to the FPGA - buying prebaked silicon in the form of an off the shelf risc-v CPU defeats most of the purpose. The purpose being everything can be built from the bottom up and at no point is any part of it out of the scope of inspection. You never actually know what is spun into a that PIC64GX1000 because you didn't place and route and oversee the fab yourself. Just because an ISA is 'open' like risc-v does not mean you know how it was implemented on-die. Having all the verilog and using Yosys+nextpnr to generate the layout for the FPGA is (about) as close to knowing the provenance of the whole stack as you can ever get.