[PCB_FORUM] setting diff pairs to only route on a certain layer pair in stackup?

Hey,

Don't know if this is possible, but here is what I 
want to be able to do.

First, I'm on WIN2000 using Allegro PCB Editor 15.2 
s111 (9-13-05).

I would like a way to setup a constraint in Allegro so 
that Diff. Pairs would route between a single layer 
pair.

I have 4 layer pairs in a 24 layer brd, and I want to 
set up a "if/then" situation, such that if the diff 
pair starts on one layer of a layer pair, then it 
could only change to the other layer within that same 
layer pair, instead of switching to a completely 
different layer pair.

Am I expecting too much - or is there a way to do this?

Thanks in advance for any help I can get! ;-)

Natalie DeGennaro
Cisco Systems

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