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Is Any version of allegro supports broad coupled differential pair routing?
No. There are various work arounds though. e.g. from the Cadence SourcelinkProblem statement: I would like route my differential pairs in a tandem fashion on adjacent layers. Is there a way to do this in Allegro PCB Editor or Allegro Router? Solution: Currently you cannot automatically route tandem differential pairs in Allegro PCB Editor/Router, but this can be accomplished manually. The rules setup in Constraint Manager will not have any effect when routing the differential pair on different layers though.To route a differential pair on tandem layers follow these steps (assuming the routing will be done on the top layer and layer 2).1) Pick Net-1 of the differential pair and start the route, right mouse button (RMB) and select "Single Trace Mode".2) Route the single trace just a small segment on the top layer, left mouse click to add a corner , right mouse click and select done.3) Select Net-2 of the differential pair, swap the route layer to layer 2, route Net-2 to where you ended Net-1 of the differential pair and add a corner to coincide with the net on the top layer, right mouse click and select done. You should now have the segment on the top layer for Net-1 and the segment for Net-2 on layer 2 exactly on top of each other.4) Select Net-1 or Net-2, right mouse click and unselect "Single Trace Mode", the differential pair will now route together. Finishing the route works the same way as when beginning the routing of the differential pair on the same layer.Cheers,KP