Re: gEDA-user: gschem: How to overwrite invisible attributes?

[Wojciech Kazubski <wk0@xxxxx>]

Sunday 30 of March 2008 21:46:56 John Luciani napisał(a):
> On Sun, Mar 30, 2008 at 2:41 PM, Stefan Salewski <mail@xxxxxxxxxxxx> wrote:
> > Hello,
> >
> >  there exists symbols with net attributes which are not
> >  visible/accessible when symbol is inserted in a schematic, for example
> >
> >  net=Vcc:14
> >
> >  Problem: I am using many different positive supply voltages, i.e. 5V and
> >  3.3V. I want that this symbol has 3.3V supply, but I have no Vcc defined
> >  (or maybe Vcc is defined to be +5V).
> >
> >  Can I simple add a new attribute to the symbol to overwrite the
> >  invisible/hidden "net=Vcc:14" for pin 14 with something like "net=
> >  +3.3V:14" ?
> >
> >  I think that I have read that this overwriting of attributes shall work
> >  -- but I can't find it again.
>
> Why not just remove the hidden nets from the symbols? With mulitple
> values of Vcc (or GND) the hidden nets create a lot of hidden problems.
>
> (* jcl *)
>
> P.S. I have a script that removes the hidden nets and generates
> appropriate power symbols.

Replace net= attributes with something else, for example power= attributes in 
each sybol with hidden power pins (keeping the same syntax for simplicity). 
Then a special tool can be created to add an external net= attribute or 
add/create the suitable power symbol.

Wojciech Kazubski


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