I have been working on designs of processors for FPGAs for quite a while. I have looked at the uBlaze, the picoBlaze, the NIOS, two from Lattice and any number of open source processors. Many of the open source designs were stack processors since they tend to be small and efficient in an FPGA. J1 is one I had pretty much missed until lately. It is fast and small and looks like it wasn't too hard to design (although looks may be deceptive), I'm impressed. There is also the b16 from Bernd Paysan, the uCore, the ZPU and many others. Lately I have been looking at a hybrid approach which combines features of addressing registers in order to access parameters of a stack CPU. It looks interesting. Anyone else here doing processor designs on FPGAs? -- Rick

Sounds like something where you'd get more responses on Are you cross-posting? -- Bill Sloman, Sydney

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What's Your Favorite Processor on an FPGA?

Apr 20, 2013 82 Replies

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Jasen Betts 13 years ago

Over half the OS calls are identical,

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Jasen Betts 13 years ago

Replying to myself, that doesn't make DOS any closer to CP/M than linux is to unix.

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DecadentLinuxUserNumeroUno 13 years ago

I think Bill Gates' early endeavors involved DR. Did j'all just miss that one?

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