himbaechel/gowin: add timing information #1345
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Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
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gatecat
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Aug 21, 2024
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It would be nice to get BRAM timings added at some point, depending on the clock-to-out time it's not uncommon for it to actually be the critical path. |
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This wires up enough of the Apicula timing data to give an Fmax for most designs. There are gaps in the implementation, but those gaps also existed in nextpnr-gowin, so it's not much of a loss.
The Fmax numbers do appear to be optimistic though - compared to the vendor tooling the numbers are about 20% higher and I don't entirely trust them. However, if the optimistic numbers say that a design doesn't meet timing, it definitely doesn't.