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LVS - not compared, number of port 0 in layout

ISHITA AGGARWAL

Hello,

so after making layouts, when I try to run DRC and LVS chceks, DRC runs successfully without any errors, but when i try to run LVS for the same layout, it shows an error which says "not compared" and the number of ports are shown as 0 for layout.

Can you please help me resolve this issue. Awaiting response.

Thank you.

Ishita Aggarwal

  • Which LVS tool are you using? Please also share the full error.

    Andrew

  • in reply to Andrew Beckett

    Sir, I am using Calibre nmLVS.

    This is the error I got.

    CELL COMPARISON RESULTS ( TOP LEVEL )



                     #   #         ########################  
                      # #          #                      #  
                       #           #     NOT COMPARED     #  
                      # #          #                      #  
                     #   #         ########################  


      Error:    Different numbers of ports (see below).
      Error:    Power net missing in layout. Ground net missing in layout.

    LAYOUT CELL NAME:         ND2
    SOURCE CELL NAME:         ND2

    --------------------------------------------------------------------------------------------------------------

    INITIAL NUMBERS OF OBJECTS
    --------------------------

                    Layout    Source         Component Type
                    ------    ------         --------------
     Ports:              0         5    *

     Nets:               9         6    *

     Instances:          2         2         MN (4 pins)
                         2         2         MP (4 pins)
                    ------    ------
     Total Inst:         4         4


    NUMBERS OF OBJECTS AFTER TRANSFORMATION
    ---------------------------------------

                    Layout    Source         Component Type
                    ------    ------         --------------
     Ports:              0         5    *

     Nets:               8         5    *

     Instances:          2         0    *    MP (4 pins)
                         0         1    *    NAND2 (3 pins)
                         1         0    *    SMN2 (4 pins)
                    ------    ------
     Total Inst:         3         1


           * = Number of objects in layout different from number in source.


    **************************************************************************************************************

  • in reply to ISHITA AGGARWAL

    Calibre is a tool from Siemens EDA (formerly Mentor Graphics), not Cadence. As such, this is not really the best place to ask about issues with another vendor's tool - perhaps you should contact their customer support or post the question on one of their forums?

    Regards,

    Andrew

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