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| Forty-Bot | does the --freq option for nextpnr actually do anything? | 17:56 |
|---|---|---|
| ZirconiumX | It sets the target frequency of nextpnr | 17:57 |
| Forty-Bot | yeah, but that change the behavior at all | 17:57 |
| ZirconiumX | Yes | 17:57 |
| daveshah | For designs with one clock domain, it doesn't change optimisation significantly | 17:57 |
| Forty-Bot | ah, ok | 17:57 |
| daveshah | There's no timing driven rip up or anything | 17:57 |
| daveshah | For multiple clock designs, timing constraints will affect relative tradeoff between domains to some extent | 17:58 |
| Forty-Bot | from experimenting, I found that a design which sometimes synthesizes above target and sometimes below it seems to meet/fail-to-meet at the same ratio even with --freq | 17:58 |
| Forty-Bot | which is rather surprising | 17:59 |
| daveshah | That's probably mostly just the pseudorandom nature | 17:59 |
| Forty-Bot | yeah; I was expecting nextpnr to "try harder" to meet timing or something | 18:00 |
| daveshah | Changing seed will have similar effect probably | 18:00 |
| daveshah | No there's nothing like that yet | 18:00 |
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