| ID: | 6309 |
| From: | rn...@igor2.repo.hu |
| Date: | Tue, 23 Jan 2024 05:38:47 +0100 (CET) |
| Subject: | Re: [pcb-rnd] please alpha test: sch-rnd hierarchic design |
| in-reply-to: | 6308 from rn...@igor2.repo.hu |
On Mon, 22 Jan 2024, rnd2@igor2.repo.hu wrote: > > >On Sat, 20 Jan 2024, rnd2@igor2.repo.hu wrote: > >Progress on these missing features: > >- hlibrary: that's the next thing I start working on Finished the initial implementation and documentation (a section under the same old URL). This means (as an option) hierarchic child sheets can be picked up from search paths now. IMPORTANT: while reading the document, please make sure you are also looking at the examples it links, using the latest svn version of sch-rnd. Without exploring the examples, the text won't make much sense. While working on this, I figured there is a major difference to gschem (and probably lepton) that should be mentioned: we don't have a hotkey to descend into hierarchic sheets. It's because... 1. gschem doesn't have an explicit abstract model but things are randomly done by the gui and/or by gnetlist. This is an ugly part: in theory everything is decided in gnetlist, but there is no feedback from there to the GUI so some of the mechanisms (like slotting and hierarchy) are re-created in the GUI, while other mechanism (like spice related things) are not and are happening only in gnetlist. But the GUI never ever has a full overview or understanding of the project: it doesn't really have a concept of networks or the full hirearchy. Instead on the GUI things happen locally. For the hierarchy this means you can descend and come back up locally through a sheet ref symbol. 2. In contrast sch-rnd implements every mechanism the same way and the same implementation drives the GUI and the netlist output by producing the same abstract model. So the GUI has the same full overview an understanding (the abstract model) that the export code is working from. Thus sch-rnd needs to load these sheets anyway, latest when the compilation starts dealing with them. So instead of hiding these sheets, they simply appear in the sheet selector. Best regards, Igor2
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