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Subject: Re: [geda-user] Pin mapping (separate symbols from mappings)
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From: John Doty <jpd AT noqsi DOT com>
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Date: Mon, 19 Oct 2015 08:40:22 -0600
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On Oct 19, 2015, at 1:25 AM, Nicklas Karlsson =
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:

>>> One geda-gaf issue is that the fundamental pin ID is
>>> refdes/pinnumber, confused a bit by slotting. That would be very
>>> hard to change, but I think mapping (original refdes)/(original
>>> pinnumber) to (as-built refdes)/(as-built pinnumber) is possible.
>>=20
>> This fails if we switch to symbolic pins, which won't have "original
>> pinnumber" any more.  Consider:
>>=20
>> http://www.delorie.com/pcb/symsym.html
>>=20
>> Which gate is "U1/pin-A" ?
>=20
> Symbol pinnumber will not help either unless there are as many symbols =
as slots.

You need as many symbols as you have functions, yes. And you need a way =
to distinguish them.

> A mapping between symbol pins and footprint pin number will solve the =
problem either as is now with pinseq or external mapping. For external =
mapping there must be a method to uniqely identify each symbol. A method =
to uniqely identify a symbol is by refdes and slot number, slot number =
would number the instance of this symbol within the same refdes.

That=92s a way. It=92s consistent with what geda-gaf has, although =
slotting is arguably a messy feature rather than a clean fundamental =
capability. Users of the older SPICE back-ends might find further =
entanglement of pinseq vexing, although that is not much of a problem =
with gnet-spice-noqsi.

>=20
> As is now there is pinseq for mapping to footprint but with this =
solution it is not possible change mapping in the schematic.

I do believe we need a way to override pin attributes in instances. =
Embed the symbol and edit? I don=92t like embedding upstream in source =
schematics, but in annotated products I think it=92s OK. Or should we =
have some attached attribute syntax for modifying pin attributes?

> Value, slot number and footprint may also work as pin mapping selector =
and by this method it would be possible to store mapping information =
externally if a different footprint library is used.
>=20
> I would probably think about if it would be possible to use value, =
slot number and footprint as a pin mapping selector because this would =
give a rather natural workflow, pin mapping could wait until layout =
should be done.
>=20
>=20
> Nicklas Karlsson
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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