gEDA-dev: Contributing symbols

[John Luciani]

On 10/22/06, Andreas Kemnade <andreas at kemnade.info> wrote:

> 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.

One way to do this would be to break the LMX9820A into two symbols --
one containing power and ground (or maybe just ground) and the other
containing signals (LMX9820A.sym for signals, LMX9820A_pwr.sym
for power and grounds). If both symbols have the same refdes they will
map to a signal footprint.

When troubleshooting a board it can be useful to have a schematic that
shows how all pins are terminated. By having two symbols you can remove the
clutter of 43 ground connections yet (in a different place) show where your pins
are connected.

(* jcl *)

---
http://www.luciani.org