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Finding loop in a Routing / Net

amitSkill

Hi,

I am trying to find a loop in a particular net. I am able to get the routing either from net tracer utility or through power plot using DIVA.

Now, I have a cell where I only have that particular routing.

I wanted to find if there is any loop exists. If yes, I wanted the list of shapes and vias associated with that loop.

There cloud be multiple loops. Loops can be filtered out based on the loop length.

Any suggestion will be highly appreciated.

Note : I am able to figure out loops in single layer using DIVA (geomHoles).

Need to trace the loop with multiple layers through vias.

Thanks,

Amit

  • Quek

    Hi Amit

    Currently there is indeed no specific cmds to check for wiring loops so I think your approach of using a physical verification tool such as Diva is good. Perhaps you can consider using a newer tool such as Pegasus (Diva->Assura->PVS->Pegasus), our newest DRC/LVS verification tool.

    Here is some additional info:
    a. Instead of checking and reporting loops, it is possible to just fix them using "critic" cmd from VSR. E.g. you can execute the following in CIW if layoutGXL tokens are available:
    rdeEval("select_all; critic -set [get_selection_set]")

    b. VSR does has a "check_route_quality" TCL cmd which checks for wrongWay, crossing, etc but it does not has a specific option for the checking of loops. Perhaps you can request your local AE support to file an enhancement for it.


    Best regards
    Quek

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