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BGA internal Wire length given

purikku22
hello! its been a while... right now we are doing a ddr3 wiring. i have some few questions regarding constraint settings for propagation delay. the customer provided us the list of BGA internal wire length, where do we input that data in the constraint? we are required to satisfy N(BGA wire interna wire lenght)+Dimm1+Dimm2... we are able to set the prop delay in Dimm1+Dimm2, but we do not know how to input the N value? any help would do. thanks. eric
  • BrynH

     You can do this by adding a Pin Delay to the BGA pins and enabling Pin Delay Analysis ( Setup> Constraints > Modes >Electrical Options).

    The pin delays can be manually added in constraint manager or you can import a pin delay file into Allegro.

    If you search for "Simple example of how to use pin delays with Minimum Propagation Delay" in Sourcelink you'll see a detailed example of this.

     

  • purikku22
    BrynH thanks for the resource. its very helpful. ill try to follow that
    as a reference...ill post again here if it is successful. tnx a lot

    BrynH wrote:
    >
    > You can do this by adding a Pin Delay to the BGA pins and enabling
    > Pin Delay Analysis ( Setup> Constraints > Modes >Electrical Options).
    >
    > The pin delays can be manually added in constraint manager or you can
    > import a pin delay file into Allegro.
    >
    > If you search for "Simple example of how to use pin delays with
    > Minimum Propagation Delay" in Sourcelink you'll see a detailed example
    > of this.
    >
    >
    >
    >
    >
    >
    > You received this email because you subscribed to notifications for
    > the Cadence PCB Design Forum. To unsubscribe, log in, go to forums,
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