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| ZirconiumX | So, I've been adding asynchronous set for synth_intel_alm, and now Yosys is spewing "Warning: Complex async reset for dff '\Q'." | 14:10 |
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| ZirconiumX | https://gist.github.com/ZirconiumX/fcd6761a630b3688956a9a63a0b13ed8 | 14:12 |
| tpb | Title: dff_sim.v ยท GitHub (at gist.github.com) | 14:12 |
| daveshah | Yes, that's a standard warning for DFF with both set and clear | 14:18 |
| daveshah | They are usually not implementable, although it seems Intel is an exception | 14:18 |
| ZirconiumX | https://www.intel.com/content/www/us/en/programmable/quartushelp/13.0/mergedProjects/hdl/prim/prim_file_dffeas.htm | 14:20 |
| tpb | Title: DFFEAS Primitive (at www.intel.com) | 14:20 |
| ZirconiumX | This is my reference here | 14:20 |
| mwk | intel and old xilinx | 14:20 |
| mwk | I have that issue on my TODO list for that reason | 14:20 |
| mwk | yosys will warn you, but will make the right-ish cell anyway, except | 14:21 |
| mwk | 1) it ignores the priority of the reset/set on input and always assumes priority of reset over set (which is what most vendors pick anyway, I think) | 14:22 |
| mwk | 2) it will emit dumb redundant logic on the set input | 14:22 |
| ZirconiumX | 1) holds for Intel, judging by the truth table | 14:23 |
| mwk | so... ignore the warning, I'll fix it sooner or later | 14:23 |
| ZirconiumX | Noted | 14:25 |
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| ZirconiumX | ...Would it be better to use asynchronous load over async reset/set? | 14:46 |
| ZirconiumX | Since now I have async reset/set, and async load/data | 14:50 |
| ZirconiumX | Which is effectively a duplicate | 14:50 |
| mwk | not really a duplicate, reset/set is strictly better | 15:06 |
| mwk | if you try to implement async set/reset in terms of async load, it's too easy to end up in glitchland | 15:06 |
| mwk | also, it may be a good idea to use both and save some logic | 15:08 |
| mwk | $_DLATCHSR_* maps cleanly to async load/data + async reset + async set | 15:08 |
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| mwk | (yosys doesn't emit them at this point, but that's *also* on my list) | 15:10 |
| daveshah | ECP5 actually has async load too, but it's totally unused by the vendor tools (unless you create an ncl file) | 15:15 |
| ZirconiumX | Okay, fair | 15:16 |
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