Re: gEDA-user: trace routing "style" in PCB

["Bert Douglas" <bertd@xxxxxxxxxxxxx>]

Thanks much for the response Harry.

I have a question about pcb and netlist input files.  Is there a way to
split a net into two parts in the file, so that two different "style"
specifications can be given to two different parts of the net?

A few points regarding previous email:
-  This "style" specification is only for a relatively small number of
wires, not for the whole schematic, definitely not for large busses.

-  I am basically worried about what happens after a year or two and the
customer wants a new version of the board.  I want to be able to edit the
schematic, move the parts around, do autoroute, and make the board.  I don't
want to lose valuable information, or have to do a lot of manual checking
and editing.

- As to your desire to avoid adding "unnecessary" information to the
schematic, I am open to alternative possibilities.  Perhaps this information
could be stored in a config file that is used by gsch2pcb.

Thanks again,
Bert Douglas


----- Original Message ----- 
From: "harry eaton" <bumpelo@xxxxxxxxxxx>
To: <geda-user@xxxxxxxx>
Sent: Wednesday, January 05, 2005 6:46 PM
Subject: Re: gEDA-user: trace routing "style" in PCB


> PCB supports per-net styles, but there is no requirement that tracks on
that
> net route with the given style. The auto-router will use the given style
> when routing. I guess that Protel's auto-router uses size attributes from
> the individual schematic wires. This puts serious restrictions on how you
> draw the schematic. Probably you need to draw the schematic with the
actual
> geometry of the layout, where each track on the board is represented by a
> wire on the schematic. I'm sure it makes for great fun on the power,
ground
> and bus nets.
>
> Personally, I think there is way too much desire to put unnecessary
> information on the schematic. Recently I changed a circuit design to swap
> aluminum electrolytic caps in place of tantalums to save costs in mass
> production. It required a change to the BOM and the layout, but the
> schematic wasn't touched. I guess that's a bad thing in some folks eyes.
>
> harry
>
> ----- Original Message -----
> From: "Bert Douglas" <bertd@xxxxxxxxxxxxx>
> To: <geda-user@xxxxxxxx>
> Sent: Wednesday, January 05, 2005 1:56 AM
> Subject: Re: gEDA-user: trace routing "style" in PCB
>
>
> > I want to annotate/tag wires on the schematic with information to
control
> > the trace width.
> > This needs to be done more finely than at the net level, as not all
> portions
> > of the same net need to carry same amount of current.
> >
> > I have done this sort of thing with Protel.
> >
> > I get the feeling that gschem/pcb do not have the infrastructure needed
to
> > support this kind of feature.
> >
> > Regards,
> > Bert Douglas
>
>
>