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Date:	Wed, 26 Aug 2015 16:14:59 -0400
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Subject:	Re: [geda-user] netlisting libraries
From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Wed, Aug 26, 2015 at 3:59 PM, John Doty <jpd AT noqsi DOT com> wrote:
>
> 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.

Slotting is another part of how we implemented light symbols that does
not quite work. Before people think I am re-igniting the heavy vs
light fight it must be said "I like light symbols" the problem is how
it was implemented. It only seems to work for 74xxx series digital
stuff.

>> 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.

I only remember what part of that was supposed to be. I kind of wish
we had more of the blue sky ideas on the wiki so that we can refer
back to them in these moments.

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



-- 
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Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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