Mail Archives: geda-user/2015/12/09/02:06:05
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On Dec 8, 2015, at 5:29 PM, gedau AT igor2 DOT repo DOT hu wrote:
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> On Tue, 8 Dec 2015, DJ Delorie wrote:
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>>=20
>>>> So already the refdes isn't a unique identifier for a symbol...
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>>> In such case it is a slot and the slot number could also be used?
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>> Sometimes. Other times, like large MCUs, there are no slots, just
>> different symbols using the same refdes, which the netlisters just
>> merge together.
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>> 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.
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> Refdes+pin sounds like a good identifier on PCB-side, but not on =
gschem-side.
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> 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.
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> 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):
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> Vcc U1-4
> GND U1-4
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> 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:
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> GND U1-4
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> 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
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> Regards,
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> Igor2
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John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com
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