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Mail Archives: geda-user/2014/03/12/10:11:20

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Date: Wed, 12 Mar 2014 19:41:05 +0530
Message-ID: <CALT8Ef686r+PJsUyZkU-uK535=2dGgmuaM1ixCgP739PCJ-sYg@mail.gmail.com>
Subject: Re: [geda-user] Declare a pin as GND in symbol
From: Shashank Chintalagiri <shashank DOT chintalagiri AT gmail DOT com>
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As an aside, and building on what Steve said, having the nets precisely
named can occasionally (or, for me, almost always) be a problem. The pad
will subsequently always connect to GND, and not PGND or AGND or what have
you. In order to switch later, you need to change the attribute which is
then hidden in a printout of the schematic or can prove just as messy, if
not more, as simply having an extra pin. The problem tends to be more
pronounced when all the supply pins are hidden, because then if you're
feeling lazy during the schematic capture, you realize the problem late
into routing and don't always immediately realize what is wrong.

One possible option, though with its own troubles, is that pins in the
footprint with the same name are always connected. The reason its
problematic is that footprints then start becoming part dependent, which is
probably even harder to track except maybe for very exotic parts.

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<p dir=3D"ltr">As an aside, and building on what Steve said, having the net=
s precisely named can occasionally (or, for me, almost always) be a problem=
. The pad will subsequently always connect to GND, and not PGND or AGND or =
what have you. In order to switch later, you need to change the attribute w=
hich is then hidden in a printout of the schematic or can prove just as mes=
sy, if not more, as simply having an extra pin. The problem tends to be mor=
e pronounced when all the supply pins are hidden, because then if you&#39;r=
e feeling lazy during the schematic capture, you realize the problem late i=
nto routing and don&#39;t always immediately realize what is wrong. </p>

<p dir=3D"ltr">One possible option, though with its own troubles, is that p=
ins in the footprint with the same name are always connected. The reason it=
s problematic is that footprints then start becoming part dependent, which =
is probably even harder to track except maybe for very exotic parts.</p>


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