Re: gEDA-user: nets in symbols

[Seb James <seb@xxxxxxxxxxxxxxxxxxxxx>]

On Monday 26 February 2007 22:34, Marc Moreau wrote:
> On Mon, 26 Feb 2007 16:06:57 +0000
>
> Seb James <seb@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > Problem 2
> > --------------
> > I am placing this symbol in a design which is split into two regions,
> > with opto-isolators connecting them. This means I have two ground nets,
> > and I also have two 5V nets.
> >
> > Instead of using the nets GND and +5V, I have gnd_left and gnd_right and
> > +5v_left and +5v_right.
> >
> > But... the nets in my symbol are GND and +5V. What is the best way to
> > redefine these nets? Should I manually add the 50 or so ground/power pins
> > to my symbol, so that I can wire each ground pin to either gnd_left or
> > gnd_right in my schematic? Or is there another way of setting what the
> > "GND" net in my symbol actually connects to? Can I redefine the nets for
> > those pins after I placed the symbol in my schematic?
>
> This is why I don't use 'hidden' nets, they get in the way when using
> multiple gnd/vcc.
>
> I group all the vcc and gnd together by expected application, and add a
> line in the schmatic. All the pins are the same length so a line is easy
> draw.  But if an other application comes up, I have all my different nets
> available.
>
> Also, Looking at your symbol, it might be nice to split your symbol by
> application. ie one symbol for each isolated half.  Just give them the same
> refdes and all is well.
>
> I attached my 4part example.  Look at power and ADC. they show what I did.
>
> I used djboxsym.pl[1] to make my symbols.
>
> [1] http://www.gedasymbols.org/user/dj_delorie/tools/djboxsym.html
>
> -Lares

Thanks both to you and to John Griessen for your suggestions. I will consider 
them carefully in the next couple of days to get this design finished.

best regards,

Seb


_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user