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Subject: Re: [geda-user] Hierarchical design, pin number not needed
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <20160126021440.f61e6e8be6bf4da5d2bafb25@gmail.com>
Date: Mon, 25 Jan 2016 18:54:43 -0700
Message-Id: <8DF71CDE-4E0D-481B-B240-99FAFE082328@noqsi.com>
References: <20160125193136 DOT c1297d2b8e17f291e2250a4c AT gmail DOT com> <9763429C-BEFE-443F-B4E7-EDB3BA4FF55D AT noqsi DOT com> <20160125223859 DOT 8f1120bf6f98c3ca60ee2b00 AT gmail DOT com> <8FA3D453-216B-489F-8862-EA004827B590 AT noqsi DOT com> <20160126021440 DOT f61e6e8be6bf4da5d2bafb25 AT gmail DOT com>
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On Jan 25, 2016, at 6:14 PM, Nicklas Karlsson =
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:

>>>>> Then using hierarchical design netlist complain if there are no =
pin numbers in symbol although in pcb it seems everything work OK =
without the pin numbers.
>>>>=20
>>>> It doesn=92t work OK if you=92re not flattening hierarchy.
>>>=20
>>> The number is in the symbol but not in the schematic underneath. How =
is the number used? Or what purpose does it fulfill?
>>=20
>> There=92s no way get get pin attributes or connections without the =
pin number in the back end. The hierarchy traversal in the core can =
=93cheat=94 because it completely removes the pin from the netlist =
structures. A hierarchical back end needs the pin, though, and therefore =
needs the pin number.
>=20
> So if hierarchical back end needs the pin how does it use it then =
there is only refdes and no pin number on sub sheet? Would it possible =
to add an enumerator in between instead?

It depends on the back end. The older SPICE back ends relate the numeric =
part of a spice-IO device=92s refdes to a pinseq attribute on the =
subcircuit symbol. My gnet-spice-noqsi imitates the gnetlist core =
behavior, relating the refdes on an io symbol to the a pinlabel on the =
subcircuit symbol. I don=92t know what other hierarchy-aware back ends =
do.

>=20
> Nicklas Karlsson
>=20

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



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