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        Sat, 23 Jul 2016 23:58:11 -0700 (PDT)
Date: Sun, 24 Jul 2016 08:58:10 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Stay or go? --> Pin mapping
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> >> > With attribute handling I mean pin mapping, BOM generation and similar which is handled thru attached attributes. I think gschem use non of the attributes itself, just assign and display which work great.
> >>
> >> Yes but to be fair slotting has it's issues.
> >
> > Attribute for pin may be changed from layout in pcb or assigned later in workflow. This is a feedback issue and attribute is not interpreted by gschem.
> >
> > If gschem assign pinnumber which I think slotting mechansim do, it must interpret the attributes and define rules for them. There is a problem because same symbol may be used at different positions for different packages and package may not be known or changed afterwards. I think point to mapping with attribute or embedded would or have solved it. Not all circuits end up on a circuit board and for these package pin numbers may not make any sense and better removed.
> >
> > This pin mapping selection is also a problem for some circuits available in different packages.
> 
> To be fair most of the time when you change the parts symbol for
> something like an fpga there is no good way to make the new extra pins
> fit in the space that was there.

Then changing symbol gschem provide no help, it must fit there it was before. If slots are used for example one pin slot it would be possible. Add more pins, change footprint and it is a matter of getting pin mapping correct.

> Have you ever used a suite that supported changing packages which
> actually handled it correctly more than 90% of the time? I have used a
> few and the 10% when it failed drove me nuts.

Yes you nailed the problem. Pin mapping must be stored somewhere and changed then changing footprint or slot. Mapping may happen then transferring to pcb or not at all if using other back end there no footprint exist.

Gschem is a symbolic graphical representation of the circuit there labels usually are used for the pins although labels in the form of a number may make sense for connector pins. Footprints usually have numbered pins but no labels.