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Substrate is connected to nodes other than VDD or VCC

csst


Dear All

In a standard cell library,  VBP and VBN is used for substrate in schematic
but  layout uses only VDD VSS and you have to add normal well taps.
I get this error in LVS

Rule No.   20 : Please Note that NWEL is connected to nodes other than VDD or VCC
Rule No.   19 : Please Note that PSUB is connected to nodes other than GND or VSS

How it can be fixed?
Same error when i pass, in netlist, VDD in VBP, and VSS in VBN

IC sub-version 5.10.41.500.6.143
Assura sub-version 4.1_USR4

Regards

Parents

  • I've noticed that compare.rul file has these lines

    PWR1 = "*VDD*"
    PWR2 = "*VCC*"
    GND1 = "*GND*"
    GND2 = "*VSS*"


    ; Check if  NWEL is connected to VDD or VCC.
     wela = geomGetNet( wel PWR1 PWR2 )
     wel_wrong = geomAndNot( wel wela )
     errorLayer( wel_wrong "Please Note that NWEL is connected to nodes other than VDD or VCC" )

    ; Check if  PSUB is connected to GND or VSS.
     psuba= geomGetNet( PSUB GND1 GND2 )
     psub_wrong = geomAndNot( PSUB psuba )
     errorLayer( psub_wrong "Please Note that PSUB is connected to nodes other than GND or VSS" )

     
    in geomGetNet() i added "VBP" for NWEL  and "VBN" for PSUB but i'm still getting the same error


    ; Check if  NWEL is connected to VDD or VCC.
     wela = geomGetNet( wel  PWR1 PWR2  "VBP" )
     wel_wrong = geomAndNot( wel wela )
     errorLayer( wel_wrong "Please Note that NWEL is connected to nodes other than VDD or VCC" )

    ; Check if  PSUB is connected to GND or VSS.
     psuba= geomGetNet( PSUB GND1 GND2  "VBN")
     psub_wrong = geomAndNot( PSUB psuba )
     errorLayer( psub_wrong "Please Note that PSUB is connected to nodes other than GND or VSS" )

    i've also tried to directly change PWR and GND variables.

Reply

  • I've noticed that compare.rul file has these lines

    PWR1 = "*VDD*"
    PWR2 = "*VCC*"
    GND1 = "*GND*"
    GND2 = "*VSS*"


    ; Check if  NWEL is connected to VDD or VCC.
     wela = geomGetNet( wel PWR1 PWR2 )
     wel_wrong = geomAndNot( wel wela )
     errorLayer( wel_wrong "Please Note that NWEL is connected to nodes other than VDD or VCC" )

    ; Check if  PSUB is connected to GND or VSS.
     psuba= geomGetNet( PSUB GND1 GND2 )
     psub_wrong = geomAndNot( PSUB psuba )
     errorLayer( psub_wrong "Please Note that PSUB is connected to nodes other than GND or VSS" )

     
    in geomGetNet() i added "VBP" for NWEL  and "VBN" for PSUB but i'm still getting the same error


    ; Check if  NWEL is connected to VDD or VCC.
     wela = geomGetNet( wel  PWR1 PWR2  "VBP" )
     wel_wrong = geomAndNot( wel wela )
     errorLayer( wel_wrong "Please Note that NWEL is connected to nodes other than VDD or VCC" )

    ; Check if  PSUB is connected to GND or VSS.
     psuba= geomGetNet( PSUB GND1 GND2  "VBN")
     psub_wrong = geomAndNot( PSUB psuba )
     errorLayer( psub_wrong "Please Note that PSUB is connected to nodes other than GND or VSS" )

    i've also tried to directly change PWR and GND variables.

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