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 How to find floating metals or unconnected layers in layout. 

Last post Tue, Mar 12 2013 10:15 AM by Alex Soyer. 3 replies.
Started by hacksgen 12 Mar 2013 06:55 AM. Topic has 3 replies.
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  • Tue, Mar 12 2013 6:55 AM

    • hacksgen
    • Not Ranked
    • Joined on Fri, Feb 19 2010
    • Posts 2
    • Points 40
    How to find floating metals or unconnected layers in layout. Reply

    Hi Everyone,

     This is my first post here. I have a custom mixed signal layout which has been designed and redesigned many times. Although I am fairly sure that no floating metals or unconnected layers exist in my layout however I would like to know if it can be verified somehow in cadence. 

    Is there any way I can find out if there are any unconnected layers in my layout (perhaps skill code or some function in cadence virtuoso layout editor).

    Thanks,

     

     
    • Post Points: 20

  • Tue, Mar 12 2013 7:23 AM

    • Alex Soyer
    • Top 75 Contributor
    • Joined on Tue, Jan 12 2010
    • Sophia-Antipolis, Alpes-Maritimes
    • Posts 70
    • Points 1,330
    Re: How to find floating metals or unconnected layers in layout. Reply

    hello,

    have you tried Tools -> Find/Replace ?

    Search for: Any Shape in Current Cellview

    Click on Add Criteria

    Choose: No net name

    Thanks,

    Alex
    • Post Points: 20

  • Tue, Mar 12 2013 8:14 AM

    • hacksgen
    • Not Ranked
    • Joined on Fri, Feb 19 2010
    • Posts 2
    • Points 40
    Re: How to find floating metals or unconnected layers in layout. Reply

     Hi Alex,

     Thans for the reply. But that doesn't seem to work as it also highlights metals which are connected to transistors and normal capacitors as well as decoupling capacitors etc..

    The layout was done using both layout-L and layout -XL so as such the connectivity reference of nets between the schematic and the layout might not be one to one.I think this is why it is  also highlighting layout nets and devices which are connected in schematic but cadence thinks that it is unconnected in layout when I apply the above search as you suggest. 

     Please understand the layout is DRC clean as well as LVS checks passes successfully.

    is there any other solution.

     

    Thanks and Regards,

     
    • Post Points: 20

  • Tue, Mar 12 2013 10:15 AM

    • Alex Soyer
    • Top 75 Contributor
    • Joined on Tue, Jan 12 2010
    • Sophia-Antipolis, Alpes-Maritimes
    • Posts 70
    • Points 1,330
    Re: How to find floating metals or unconnected layers in layout. Reply

    Hi,

    I'm sorry but from my side I don't know any other command to do that especially if you connectivity is not compliant with Layout XL.

    Thanks,

    Alex

     
    • Post Points: 5
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Started by hacksgen at 12 Mar 2013 06:55 AM. Topic has 3 replies.