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Subject: Re: [geda-help] Please help with multiple-pages schematics
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From: John Doty <jpd AT noqsi DOT com>
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Date: Sat, 18 Feb 2017 12:27:37 -0700
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On Feb 18, 2017, at 11:56 AM, Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via =
geda-help AT delorie DOT com] <geda-help AT delorie DOT com> wrote:

>>=20
>> On the other hand, we *do* allow the case of a =93package=94 derived =
from multiple symbol instances. Here, Vasily is trying to use that =
freedom in a way that appears to make sense in his application.
>=20
> Not for such cases, anyway. See (2). Such using can get confusing
> even for the author after a while, especially when schematics are
> large enough.

But it can also reduce confusion to have the same pin appear in multiple =
places. For ACIS on Chandra, in Viewlogic, I had slotted dual opamps =
with power pins on the opamp symbol. This allowed me to be clear about =
the rails a particular opamp used for power, important in a complicated =
system with multiple power rails. But Viewlogic would warn me if I did =
it wrong and shorted one rail to another.

More recently, I=92ve been using gschem with Kai-Martin-style separate =
power symbols for this case. And I did, once, make the mistake of =
choosing a slot from a component that used the wrong rails for the =
purpose. The result was subtle misbehavior of the fabricated circuit. My =
fault, but maybe the tool could help better.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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