We are now considering how the backplane is to be laid out. One question is
layer stackup. We need at least 6 layers. At a first pass we are
considering either
1.
Signal
Ground
Signal
very thick core
signal
Power
signal
or
2.
ground plane
signal
3V plane
signal
thick core
signal
5V plane
signal
ground plane
Would you care to comment on these please given that we also need to have
fairly uniform trace impedances
I do not want alternating signal/plane layers as we will have some
difficulties getting the backplanes manufactured.
Garry Allen
Australian Broadcasting Corporation
Ultimo
<[email protected]>