When routing multilayer boards it is often desirable to have a signal routed
on a particular layer. For example: power signals on top, digital on an
inner layer, analog on a different inner layer etc. It would be really nice
to be able to add a preferred layer to a signal and/or a class for the
autorouter.
It is true that you can currently autoroute one group of signals with a set
of layer costs and then route the next group with a different cost, but this
method often ends up with very undesirable results. Typically the first
group of signals routed will cut off the other signals from their logical
path because the autorouter is only considering the group of signals it is
currently routing.
Thanks,
Brian Albiston
Hood Technology
