On 08/03/2010 10:54 AM, Andrew Poelstra wrote:
My problem is that I'm used to thinking of layers as physical layers, and I'm confused about the logistics of using virtual layers.
What I think we've been meaning as we talk about virtual layers is either a layer group of two or three that has vias between, or a subset of that for a special purpose. A very useful subset of 3 board layers that are going to have vias between would be a power routing group that has all the same size traces. The same 3 board layers that are going to have vias between could also have virtual groups with narrower traces. another virtual group could be controlled impedance traces that use only two of the above three physical layers because they have the correct thickness and relative positions. Then one could happily route with vias and trying to route out of the virtual group would not work, and probably remind you of the rules you wrote for the virtual layer. JG -- Ecosensory Austin TX _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
