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by sweetjuly
757 days ago
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You can definitely go considerably faster. A lot of these FOSS cores are either outright unoptimized or target ASICs and so end up performing very badly on FPGAs. A well designed core on a modern FPGA (not one of these bottom of the barrel low power Lattice parts) can definitely hit 250+ MHz with a much more powerful microarch. It's neither cheap nor easy which is why we tend not to see it in the hobby space. That, and better FPGAs tend not to have FOSS toolchains and so it doesn't quite meet the libre spirit. But, yes, even at 250MHz trying to run Chipyard on a softcore would certainly be an exercise in patience :) |
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