Hi all, On Mon, 2009-06-22 at 21:46 -0400, Harry Eaton wrote: > > Stefan Salewski <[email protected]> wrote: > > > > I wonder if the PCB autorouter should be more closely bound to the > > gschem schematics. For example, in the schematics we may specify > > priority of nets (fast signals, power, ...), trace width or clearance > > for net segments. Maybe by attributes? I have no idea how commercial EDA > > software handles this. > > This is the point of "(6) use routing styles in the netlist to have > per-net routing styles." > It doesn't provide "priority" (whatever that is), but it allows you to > specify a routing style for each net which includes trace width, > clearance, and via parameters. This is a feature that pcb's > netlist-file format (and auto-router) has supported for many years > now. > > It makes sense for the gschem netlist generator to support it; I'm > supposing from your comment that it doesn't already. That is not the > fault of the autorouter, it came first. >
<to be included in wiki> > One major drawback at the moment is that all of the net is expected to > have the same characteristics, so if for example you make a "power" > net style that is 20 mils wide with 15 mil clearance, it won't be able > to connect to a fine-pitch part because the constraints can't be met > due to the part characteristics, but it will route what it can. If you > manually create "breakouts" that the autorouter can connect to without > violating constraints, it can then make the connections. Be sure that > any such breakouts have either vertically or horizontally oriented > lines or a via where you want the connection made because the > autorouter will not connect to any diagonal copper. > </included in wiki> More insight :-) Kind regards, Bert Timmerman. > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
