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| famubu[m] | Yeah I was mistaken. | 02:44 |
|---|---|---|
| famubu[m] | Yosys log shows the number of FFs changing. | 02:44 |
| famubu[m] | DFFCE value increases as design size increases. | 02:44 |
| famubu[m] | But the utilization report generated by nextpnr doesn't show a register count. | 02:45 |
| famubu[m] | Instead it only mentions LUT count. | 02:45 |
| famubu[m] | Does that mean LUTs are used for making registers? | 02:46 |
| famubu[m] | This is the relevant part from yosys log: https://bpa.st/RY6A | 02:46 |
| tpb | Title: View paste RY6A (at bpa.st) | 02:46 |
| famubu[m] | And this is the utilization report from nextpnr: https://bpa.st/DP3Q | 02:46 |
| tpb | Title: View paste DP3Q (at bpa.st) | 02:46 |
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| jix | SLICE is used for registers | 06:22 |
| jix | (at least the gowin architecture docs say that a configurable logic slice can contain registers, I haven't used anything gowin myself) | 06:24 |
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| famubu[m] | I see. | 08:36 |
| famubu[m] | But slice contains both register and LUT, I think. | 08:36 |
| famubu[m] | I don't know why nextpnr only mentions slices and LUT count. | 08:36 |
| famubu[m] | I had thought it was because no registers were being used. | 08:37 |
| famubu[m] | Wild guess: Would Slices - LUT count give register/FF count? | 08:37 |
| famubu[m] | yosys synthesis log mentions FFs and LUTs. But not the utilization report from nextpnr. | 08:37 |
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