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Subject: Re: [geda-user] netlisting libraries
From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <CAM2RGhRsUOWb+j24Np2myPDkA9o6L5+KVOrTH=zUJH4XF85zow@mail.gmail.com>
Date: Wed, 26 Aug 2015 15:59:41 -0400
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On Aug 26, 2015, at 3:31 PM, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:

> On Wed, Aug 26, 2015 at 1:21 PM, John Doty <jpd AT noqsi DOT com> wrote:
>> 
>> On Aug 26, 2015, at 12:58 PM, Roland Lutz <rlutz AT hedmen DOT org> wrote:
>> 
>>> On Wed, 26 Aug 2015, John Doty wrote:
>>>> The overloading of pinseq is really the only one I’ve found troublesome, so gnet-spice-noqsi gives you other ways to handle slotted devices.
>>> 
>>> I've never understood the motivation for the SPICE netlist backends to use pinseq= at all.  Is this just a hack to get the unslotted pinnumber?  Or is there some other mechanism involved?
>> 
>> I believe it’s copied from the Viewlogic architecture. It never worked right there, either.
> 
> I thought you use pinseq refer to spice models and pinnumber refers to
> pins on a part as packaged.

Yes, but the problem is that we also use pinseq to define pin mapping for slotting. The package presented to the gnetlist back end for a slotted component has more than one pin with the same pinseq. Which is which? And hidden pins have *no* pinseq. So, for slotted components I usually use pin numbers in spice-prototype attributes.

> The part that is screwy is how we pretend
> that symbols are light (package & footprint agnostic) when changing
> their footprint changes their pin numbers.

DJ’s database idea has grown on me over the years. Draw light source schematics, forward-annotate reference designators, footprints, pin assignments, part numbers, etc. for the as-built drawings.

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