Re: gEDA-dev: Diode symbols in GSchem and PCB

[Stuart Brorson <sdb-at-NOSPAMcloud9_dot_net>]

B>> I guess I am confused.  The nand gate in the symbol lib would just
>> keep its old pinnumbers, which would correspond to whatever
>> asssignments are in the .sym file, i.e. the pinouts for a DIP-14 or
>> whatever.   The place wehre this is overwritten is in the .sch file.
>>
>> Perhaps I have missed your point?  If so, please elaborate...
>
> Consider a TC7S00F single nand gate.  Input on pins 1 and 2, output on
> 4, gnd on 3, vcc on 5.  Now consider a 7400FK quad nand gate.  Inputs
> on pins 2/6/13/18 and 3/8/14/19, outputs on 4/9/12/16, gnd on 10, vcc
> on 20.

OK.  But in this case I'd just say: these are two different symbols.
One is a quad nand gate with slotting, and the other is a single
nand.

Making them the same symbol is a whole different issue, introducing
its own set of complexities.   I don't think gEDA supports this now,
nor do I think it should support it in the future.  It implies that we
need that level of indirection between symbols and footprints which we
previously discussed.

Therefore, assuming that such a case calls for two separate symbols,
my humble scheme would never encounter the situation you propose,
right?

>> That's easy.  It's the job of gnetlist to take that info from the .sch
>> file and stick it into the netlist.  AFAIK, gnetlist (& gsch2pcb)
>> already writes pinnumber, pinname, and pinlabel into the netlist.  Or
>> am I wrong?
>
> I didn't see a "pinname" attribute in the master list.

Fine.  If "pinname" not there, it doesn't get written, right?

The only pin attrib you really need for netlisting to PCB is
pinnumber; everything else is gravy.

Stuart


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