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net assignment question

masamasa

hello

how can i assign a net as a ground or power?

based on the artical below, i should identify the power and ground nets in order to maximize the performance but i do not know how.

https://community.cadence.com/cadence_blogs_8/b/pkg/posts/how-to-maximize-performance-when-your-package-layout-gets-complicated

i assume i need to assign some nets as ground or power in the constraint manager.

currently all nets on the netlist are assigned as a signal net so any command takes a long time to execute.

  • steve

    In Constraint Manager go to Properties - Net Properties - General and add a Voltage value for the Power and GND nets. They will then display differently in the design (so not point to point but show a square with a cross in the middle on each pin). 

  • masamasa
    in reply to steve

    thank you steve

    i was able to set up the ground and power nets and saw a cross in the middle on each pin.

    but i do not see any significant performance difference on each command yet.

    you always help me a lot.

    anyway thank you again.

  • masamasa
    in reply to masamasa

    one more question,

    i got this message after i run the performance advisor on dbdoctor.

    * PLANE_FL3 net has VOLTAGE property, but the ratsnest schedule is is NOT  "POWER_AND_GROUND".

    how can i set the nets with the voltage property i specified as "power and ground" on the ratsnest schedule?

     

  • steve
    in reply to masamasa

    Try Edit - Properties on the net (Find pane) then choose Ratsnest_Schedule and set Power and Ground. Not convinced this will give you a huge saving either.

  • masamasa
    in reply to steve

    thank you steve

    i was able to setup the ratsnest schedule.

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