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Subject: Re: [geda-user] gsch2pcb after refdes-renum? (If implemented syncronization detail)
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <alpine.DEB.2.00.1512090417270.9035@igor2priv>
Date: Tue, 8 Dec 2015 21:05:51 -1000
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On Dec 8, 2015, at 5:29 PM, gedau AT igor2 DOT repo DOT hu wrote:

>=20
>=20
> On Tue, 8 Dec 2015, DJ Delorie wrote:
>=20
>>=20
>>>> So already the refdes isn't a unique identifier for a symbol...
>>>=20
>>> In such case it is a slot and the slot number could also be used?
>>=20
>> Sometimes.  Other times, like large MCUs, there are no slots, just
>> different symbols using the same refdes, which the netlisters just
>> merge together.
>>=20
>> At best, "refdes + pinnumber" may be a unique identifier, *except*
>> that changing the refdes and/or pin numbers changes the identifier...
>> and those are the things we want to change.
>=20
> Refdes+pin sounds like a good identifier on PCB-side, but not on =
gschem-side.
>=20
> When I use stock dual-opamp-1.sym (slotted) pin+refdes it's not unique =
in the sense that there are two instances of the very same power pins (4 =
and 8) on the schematics.
>=20
> If I connect Vcc to pin 4 on slot 1 and gnd to pin 4 on slot 2, I get =
the following netlist (in the gsch2pcb flow):
>=20
> Vcc U1-4
> GND U1-4
>=20
> Same happens without slotting. However, if I take only one slot and =
connect both Vcc and GND to the same pin 4, only one net remains:
>=20
> GND U1-4
>=20
> This suggests the pcb gnetlist backend (or maybe gnetlist) already =
uses a per gschem-component identifier and refdes or refdes-pin doesn't =
fully identify a component or a pin.

What happens in this case depends on how the back end retrieves the =
connection information from the core. My check-duplicates back end will =
detect such cases. =
http://www.gedasymbols.org/user/john_doty/tools/check-duplicates.html

>=20
> Regards,
>=20
> Igor2
>=20

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



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