Re: gEDA-user: random project idea

[DJ Delorie <dj@xxxxxxxxxxx>]

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.


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