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What is the best practice/method to define and route a net in a specific order and...

F150
What is the best practice/method to route a net in a specific order.
 
Also-
 
What is the best practice/method to define and route a net in a specific order AND control the length of certain individual segments of that net (i.e. a net has 4 pins and must be routed in a certain pin order- furthermore the trace length between the first and second pins need to be controlled and also –the overall length of the entire net needs to be controlled).
 
  • Khurana

    I think you are asking about net schedule feature.  A net route order can be defined by going to Logic > Net Schedule > click on the pins > right click > select done.  For length control you will need to create pin pair and then define min/max propagation delay in Allegro Constraint Manager, which is available in Allegro Performance or higher.

  • KeithP
    I would use SigXplorer from the Allegro Contraint Manager. Here you can modify the topology (net order) add your rules (pin pairs or length) and then apply the topology to as many nets as you need.
  • F150
    Thanks- I tried your suggestion and it works fine…but- I can’t seem to copy- the scheduled net with a pin pair defined- to other nets. If this is possible- do you know how to do it?  
  • Khurana

    In Constraint Manager, go to File > Import > Topology > select the .top file.  This will import as an electrical constraint set (ECSet).  To assign this ECSet, to the net(s) just left click in the Reference Electrical Constraint Set column cell(s) and select the ECSet (the name of ECSet will be same name as topology file).

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