[SI-LIST] High speed signal on top layer

Hi all,

We are layout one 3.0Gbps high speed backplane. The original design style
is routing the edge coupling differential signals in the internal layer,
with adjacent GND plane. Now we met the layer limitation, and here is the
questions,
1. Can we routing the differential pair on the top layer with GND plane
on the second layer? In my knowledge, it seems functional but odd.
Please give your advice.
2. Can we use one continuous power plane (12v or 5v) as the reference
plane to the high speed signals? For example, if 3.0Gbps signals on top
layer works, can the second layer be +12v power plane?

Thanks in advance,
Best Regards,
George
USI Shanghai RD Center

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