FreeLists / si-list / [SI-LIST] BGA Fan Out

[Fred Townsend <fred@xxxxxxxxxxxxx>]

I have a client that is proposing the following for his BGA fan out. 

BGA = 17 x 17 x 1mm with 0.6mm pads

power is applied to the inside 9x9 grid leaving 4 rows, each side, on 
the outside for signals.

4 layer stackup = sig/gnd/3 voltage split plane/sig with 4 mil sig to 
plane spacing

vias are limited to a 10 mil drill size

min trace to trace = 4/4/4 mils

has anyone ever heard of doing such a thing?


Fred Townsend
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