Re: gEDA-user: Slotting and visible power connections

["Mark Rages" <markrages@xxxxxxxxx>]

On Tue, Nov 4, 2008 at 7:42 PM, Joerg <joergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Sorry for asking a lot here lately but I believe others will hit this
> snag as well and I could not find much info about it, not even via a web
> search outside geda.seul.org:
>
> Often power pins must be made visible. For example if you have to filter
> the supply for digital parts or opamps separately for each instance. Or
> if you use a 74HC14 at 5V and another 74HC14 on the same schematic at 3.3V.
>
> Those power pins show up on every single slot. Looks quite ghastly on a
> schematic. So the LM358 dual-opamp was to be my first part made with
> gEDA. I tried this:
>
> Slotdef=2: 5,6,7
> Slotdef=1: 3,2,8,4,1
>
> That butchered it. Connected both outputs to pin 1 and assigned pin 7 to
> the supply (which should have been the 2nd output). Somehow I'd have to
> have power pins on slot 1 but none on all the others.
>
> Is there a somewhat orthodox way to do this? A method where renumbering
> at a later point doesn't break refdeses?
>

I don't know about renumbering, but the standard way to handle this is
to use two different symbols with the same refdes.   You could use one
symbol for each slot in a dual part, with one having power pins
included.  Or as I do, have a two-pin symbol for the power pins, then
two instantiations of the LM358 op-amp symbol for the two op-amps.  As
long as all three have the same reference designator, the netlister
will do the right thing.

Regards,
Mark
markrages@gmail
-- 
Mark Rages, Engineer
Midwest Telecine LLC
markrages@xxxxxxxxxxxxxxxxxxx


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