"Cobbe,John" wrote:

> Hi Kiernan
> You will not be able to route on the internal plane layers.

There is a way to do this.  You can define a new split plane region
for every net you will route on the plane.  If there are just a few nets
left to route, and they won't mind a lot of extra capacitance, then this
will work.  Many times, there might be a reset signal, voltage reference
or some other signal that can be routed on the plane layer to allow other
nets the room to be routed on the signal layers.

Usually, I can find some awful "knot" that the autorouter has created
that blocks many routes form being made.  After a manual cleanup
pass to remove the knots and traces that have been placed to violate
the layer bias, it is possible to complete the routing with little trouble.

Jon

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