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| cr1901_modern | https://github.com/YosysHQ/yosys/issues/2481 Could someone explain to me why cells beginning with "$__" are special, and how they differ from internal cells starting with "$" and "$_"? | 20:42 |
|---|---|---|
| mwk | there are three kinds of internal cells | 20:46 |
| mwk | $lowercase, $_UPPERCASE_, $__UPPERCASE | 20:46 |
| mwk | the first two are generic cell types supported by all passes | 20:46 |
| mwk | $lowercase is generally multi-bit parametrizable before-mapping cells, $_UPPERCASE_ are single-bit paremeterless cells | 20:47 |
| mwk | and $__UPPERCASE are flow-specific cell types that only exist for a short moment and usually don't have proper models etc. | 20:48 |
| cr1901_modern | $__UPPERCASE is my intended cell type- the attrmvcp pass breaks when I try to move attributes to an $__UPPERCASE cell. They will immediately be techmapped to the "real" cell type (hopefully w/ attrs intact) | 20:52 |
| cr1901_modern | Is this considered a bug, or do I need to just suck it up and expose those cells as blackboxes in my cells_sim.v file? | 20:53 |
| cr1901_modern | (without an internal prefix) | 20:53 |
| mwk | are you reading cells_sim.v with -icells param? | 20:55 |
| mwk | this should solve the "cannot get direction" problem | 20:55 |
| cr1901_modern | Right now the cells aren't _in_ the cells_sim.v file | 20:56 |
| cr1901_modern | but noted | 20:56 |
| cr1901_modern | They are created as part of iopadmap | 20:56 |
| cr1901_modern | Are they supposed to exist already in the cells_sim.v file? | 20:56 |
| mwk | depends | 20:57 |
| mwk | if you want to simulate partially-synth'd designs, that tends to be useful | 20:57 |
| mwk | but hmmm | 20:57 |
| mwk | I wonder if the proper thing here could be to improve iopadmap | 20:57 |
| mwk | and/or attrmvcp so that you can specify a particular port manually | 20:58 |
| cr1901_modern | Do you have a moment to look over my branch (machxo2) if I highlight the relevant code? | 21:00 |
| cr1901_modern | >and/or attrmvcp so that you can specify a particular port manually | 21:06 |
| cr1901_modern | Tbh, I'm not sure how attrmvcp works even after reading the help and trying to create my own select queries. I ended up copying from the greenpak backend. | 21:06 |
| cr1901_modern | (attrmvcp seems to need _two_ separate selections to work? Idk) | 21:06 |
| cr1901_modern | (afk for now- sorry, nevermind) | 21:11 |
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