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| Lofty | daveshah: what's the default state of iCE40 pullups? Wondering because of https://twitter.com/The6P4C/status/1271791013216976897 | 13:07 |
|---|---|---|
| daveshah | it's on if they are unused or the pin is not included in the design; off if the pin is included | 13:07 |
| daveshah | they are also on if the chip isn't configured | 13:08 |
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| cr1901_modern | git rev-list HEAD@{1}..HEAD | wc | 19:08 |
| cr1901_modern | 1783 1783 73103 | 19:08 |
| cr1901_modern | Oh my... :o | 19:08 |
| cr1901_modern | (And that was since January!) | 19:08 |
| cr1901_modern | I know I'm a bit late to the party, but what is "abc9" and how does it differ from "abc"? | 19:37 |
| Lofty | cr1901_modern: two things; ABC9 is box-aware (e.g. memories and flops are things that cannot be mapped by ABC but are important to know about), and it uses a generalised delay model (e.g. input->output path is measured in picoseconds, and varies for paths, which reflects real-life hardware better) | 19:44 |
| Lofty | Another important box is carry logic, where ABC9 can prune carry chains it can prove are unneeded | 19:44 |
| cr1901_modern | Is it a special input arg to abc or? I don't think I've ever conciously used it | 19:45 |
| Lofty | For Yosys flows, you can enable it with -abc9 | 19:46 |
| Lofty | https://github.com/ZirconiumX/yosys-cookbook/blob/master/ecp5.md | 19:46 |
| tpb | Title: yosys-cookbook/ecp5.md at master · ZirconiumX/yosys-cookbook · GitHub (at github.com) | 19:46 |
| Lofty | (and should for ECP5) | 19:46 |
| Lofty | (and Xilinx) | 19:46 |
| Lofty | (in Intel, I don't give you a choice; you get ABC9 :P) | 19:47 |
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