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

["harry eaton" <bumpelo@xxxxxxxxxxx>]

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