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philtor | when running synth_lattice for machX03 I see the following results: Number of cells: 190, CCU2D 14, LUT4 113, TRELLIS_FF 63 (those last 3 add up to 190) - what is CCU2D in this context? | 17:28 |
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lofty | philtor: a two-LUT4 SLICE in carry chain mode | 18:21 |
lofty | The ECP5 has the CCU2C, but the C and D have inverted carry senses | 18:22 |
philtor | Would I expect to see much difference between diamond synth results and yosys synth results? | 18:24 |
lofty | Yosys is usually worse, but not that much worse. Easiest way to check is to just try building it with diamond. | 18:25 |
philtor | (just trying to reassure coworker that yosys should be fine to use for a small machx03 design - ultimately in the 2100 LUT part) | 18:25 |
philtor | Yeah, then I have to fire up diamond and figure out how to use it ;-) | 18:25 |
lofty | Pfft | 18:26 |
lofty | philtor: the machxo defaults focus more heavily on area than for ecp5; if there's a complaint about speed, there's plenty of headroom available | 18:27 |
philtor | speed shouldn't be an issue for this project. Area is at a premium | 18:28 |
philtor | There's nothing going at faster than 60Mhz here | 18:29 |
lofty | ... Yeah, well, you might be a little surprised how much some features help | 18:33 |
so-offish | Hi everyone, I'm interested in using the Surelog->UHDM->Yosys flow to do more complete formal methods. | 18:35 |
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titan | Hi. Does anyone manage to encode all fsm into bianry rather than one-hot? | 22:30 |
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