Ok, you're cheating by using via-in pad ;-) I think the "generic" breakout (at least for us hobby types) is one trace between pads, and one between vias. So you can bring out two (signal) rows on top, two rows (through vias) to some other layer, and one more row for each additional layer. In your example, you're bringing out eight signal rows, so: two on top, two on next, and four more layers for the rest, or six signal layers.
If you can get two traces between pads, that's an extra row that can come out on top. If you can get two traces between vias, it's three rows for the first non-top layer, and two rows for each layer beyond that. For your example, that's three on top, three on next, and one more layer for the next two. You should have been able to do it with only three signal layers. between: 1 1/2 2 signal rows ----------- 1 1 1 1 2 1 1 1 3 2 1 1 4 2 2 2 5 3 2 2 6 4 3 2 7 5 4 3 8 6 5 3 9 7 6 4 10 8 7 4 None of this includes the power block at the center, or other power pins. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user