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Finding the leaf clock nets in the design

ssuhas

Hi,

I am applying NDR's only to the clock nets. But when I see manually the clock routed after CTS. Only certain clock have been applied NDR.But I have not applied NDR for leaf nets. SO wanted to find the leaf clock nets of the design. Can you please tel me how do we find the leaf clock nets in SOCE.

If possible please let me the changes to be done in the clock speacfication file after applying NDR and performing CTS.

 

Thanks

 

Parents

  • I'm not sure I completely understand the question. Are you saying that you want all of your clocks to use the NDR, but some of them are not using it? 

    Make sure you have the NDR description at the top of your .ctstch file:

    #-- Wide_wire Route Type --
    RouteTypeName DBLWIDE
    TopPreferredLayer 4
    BottomPreferredLayer 3
    NonDefaultRule DBLWIDE
    End

    Then make sure that each clock section uses it:

    RouteClkNet    YES
    RouteType      DBLWIDE
    LeafRouteType  DBLWIDE

     If you want the leaf nets to use a different rule, you can specify that, but the rule needs to be defined at the top of the .ctstch file.

    Hope this helps,

    - Kari

Reply

  • I'm not sure I completely understand the question. Are you saying that you want all of your clocks to use the NDR, but some of them are not using it? 

    Make sure you have the NDR description at the top of your .ctstch file:

    #-- Wide_wire Route Type --
    RouteTypeName DBLWIDE
    TopPreferredLayer 4
    BottomPreferredLayer 3
    NonDefaultRule DBLWIDE
    End

    Then make sure that each clock section uses it:

    RouteClkNet    YES
    RouteType      DBLWIDE
    LeafRouteType  DBLWIDE

     If you want the leaf nets to use a different rule, you can specify that, but the rule needs to be defined at the top of the .ctstch file.

    Hope this helps,

    - Kari

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