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Re: gEDA-dev: Contributing symbols
On Fri, 20 Oct 2006 08:09:33 -0400
"John Luciani" <jluciani@gmail.com> wrote:
> On 10/20/06, Andreas Kemnade <andreas@kemnade.info> wrote:
>
> > In http://geda.seul.org/wiki/geda:scg drawing power pins is strongly
> > discouraged. I tried to
> > follow the rules in that document as good as possible. In
> > http://geda.seul.org/wiki/geda:faq-gschem hiding power pins is
> > strongly discouraged with good reasons. That's a bit contradictory.
> > What should be donewith multiple GND (not things like separated
> > analog and digital GND) pins? When hiding them, they are merged. But
> > how do I manage to only have one GND pin in the symbol, so I have to
> > attach only one wire for GND?
>
> As you have discoverd the problem with hiding pins is the automagic
> merging. This creates problems if you have a system with multiple
> grounds or want to connect a
> "GND" pin to something other than ground. I would strongly *encourage*
> you to draw
> power and ground pins and have one symbol pin for each.
>
I'll add GND/power pins to my symbols.
To clarify the question I have about multiple GND pins or in general
multiple pins with *exactly* the same function:
Is it possible somehow to have multiple pins in the footprint
for one pin in the symbol?
Here is an extreme example for what I mean:
If I would like to have a symbol for the LMX9820A (a bluetooth chip),
which
has three different sorts of ground pins:
41 RF GND pins
1 Dig_gnd_1 pin,
1 Dig_gnd_2 pin
the symbol would have 43 pins for GND. That would be a horrible mess.
I think it would be enough to have three ground pins (one for each
sort of GND) in the symbol.
Another interesting example
is the IRF7416, a single Power-MOSFET in a
SO-8 package. pins 5-8 are drain, 1-3 are source, 4 is gate.
In the schematic, I would prefer to use a usual normed transistor symbol
with three pins there.
Greetings
Andreas Kemnade
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