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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 11:06:02 -0600
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On Oct 19, 2015, at 10:40 AM, DJ Delorie <dj AT delorie DOT com> wrote:

>=20
>>> Where did U2 come from?  My sample schematic would have U1-1 and =
U1-1.
>>=20
>> You have to have some way to distinguish them.
>=20
> If the tool *requires* that each symbol be unique, then either=85

It only requires they be unique if they refer to distinct entities. And =
that, fundamentally, is in the mind of the designer.

For particular purposes, the gnetlist back ends could do a better job of =
detecting confusion. There=92s some of that in gnet-spice-noqsi: no more =
=93invalid wanted_pin=94 errors, but a more useful: "pinseq=3D~A not =
found for refdes=3D~A
This may indicate an erroneously duplicated refdes.\n=94.

>=20
> 1. It must not let the user provide non-unique symbols, or
>=20
> 2. It must produce a hard error when it detects non-unique symbols, or
>=20
> 3. It must provide some user-independent way of making the symbols =
unique.
>=20
> gaf currently does none of these.
>=20

Rigid thinking, taking away the user=92s freedom to use the tool as =
their problem requires. (3) requires  clairvoyance.

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



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