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Date: Fri, 17 Feb 2012 13:05:17 -0500
Message-ID: <CAErn8cKU79Rw77CKG16w7Qcvp4Ey58J9E+VNGN41K8e=CPNWbw@mail.gmail.com>
Subject: Re: [geda-help] How can I route multi-pad signals?
From: Luis Emiro Linares <macgyveremir AT gmail DOT com>
To: geda-help AT delorie DOT com
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Thanks for the suggestion on the tools. As an exercise, I generated
this footprint with a python script of my own. Now, on the gschem
side, given that I need to make as many clones of each repeated pin as
necessary, is it OK to do the following?:

1. Place all clone pins of a common signal (say, VSWH) overlaped, so
they show up as a single pin
2. Hide the name and pin number for all but one of the pins, so it
doesn't look cluttered

On Fri, Feb 17, 2012 at 12:42 PM, DJ Delorie <dj AT delorie DOT com> wrote:
>
>> 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



-- 

Luis Emiro Linares García
------------------------------
Físico - Ingeniero Electrónico
Universidad de los Andes
Bogotá D.C., Colombia.