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Date: Fri, 17 Feb 2012 12:42:55 -0500
Message-Id: <201202171742.q1HHgtaM032232@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: geda-help AT delorie DOT com
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	<CAErn8cJO8mV6qCFSrrKgQ1iDYQzb4nUwxFjN_2+hLgX+Dbp5Gw AT mail DOT gmail DOT com>
	(message from Luis Emiro Linares on Fri, 17 Feb 2012 11:16:16 -0500)
Subject: Re: [geda-help] How can I route multi-pad signals?
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	<201202151829 DOT q1FITZgo006033 AT envy DOT delorie DOT com> <CAErn8cJO8mV6qCFSrrKgQ1iDYQzb4nUwxFjN_2+hLgX+Dbp5Gw AT mail DOT gmail DOT com>
Reply-To: geda-help AT delorie DOT com


> The chip is the FDMF6707 DrMOS module from Fairchild.

The datasheet for that has a suitable footprint and a sample pcb
layout for that.  You'll need to use polygons (not traces) to connect
them up that way, and use the 's' key to make each polygon "solid".

> 1. Could you please elaborate on how, if the pads have different pin
> numbers, the autorouter will know?

The datasheet shows the pinout, with the various pins (er, pads)
numbered from 1 to 43.  You should copy that numbering.  Thus, there
will be eight pins that are connected to the VSWH net, and the
autorouter will know that all eight need to be connected.

> 2. For the gschem symbol, Is it valid for me to define a multi-pad
> signal (i.e. PGND) by setting its pinseq and pinnumber both equal to a
> comma-separated list of the pad numbers to which it corresponds in the
> footprint?

No.  You need to make individual symbols pins for each physical
electrical connection.  You should have 43 pins in your symbol when
you're done.

Note: the easiest way to make symbols for these types of chips is to
use something like djboxsym or tragesym, which take a *list* of pins
and make the symbol for you.

http://www.gedasymbols.org/user/dj_delorie/tools/djboxsym.html