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" <[EMAIL PROTECTED]> To: <[email protected]> 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" <[EMAIL PROTECTED]> > To: <[email protected]> > 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 > > >
