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Process antenna violation?

Hoang Nguyen

Hi, 

I already set options to fix process antenna violations:

- setNanoRouteMode drouteFixAntenna true
- setNanoRouteMode routeInsertAntennaDiode true
- setNanoRouteMode routeAntennaCellName FILLANT1 (process C35B4)

However, the Process Antenna violation tool still reported more than 60 violations. I also tried to set routeAntennaCellName to automatic mode but result was the same. In the routed design, I can find only one cell of kind FILLANT1. There is plenty of space around violations points to place diodes but Nanaroute did not do that.

I exported and run verification in Virtuoso but number of violations was still big (~40).

Do you know how to reduce number of process antenna violations in Nanoroute ?

Thank you very much!

Hoang

 

 

 

 

 

Parents

  •  Hi Kari,

    There are some cells named FILLANT1,2,5,10,25 in the CORELIB.lef file (AMS C35B4 tech). They are all defined as CLASS  CORE ANTENNACELL. For example, definition of FILLANT1 is:

    MACRO FILLANT1
      CLASS  CORE ANTENNACELL ;
      FOREIGN FILLANT1 0.000 0.000 ;
      ORIGIN 0.000 0.000 ;
      SIZE 1.400 BY 13.000 ;
      SYMMETRY X Y  ;
      SITE standard ;
      PIN ANT1
        ANTENNADIFFAREA 1.0 ;
        DIRECTION INPUT ;
        PORT
          LAYER MET1 ;
            RECT 0.250 3.450 1.150 4.350 ;
        END
      END ANT1
      PIN gnd!
        ...
      END gnd!
      PIN vdd!
        ...
      END vdd!
    END FILLANT1 

    If I set "automatic"mode, no diode was added. But if I set cell name to FILLANT1, I can find only one cell of that kind was added to fixed the process antenna violation.

    Any suggestion?

     

    Thanks

    Hoang

     

     

Reply

  •  Hi Kari,

    There are some cells named FILLANT1,2,5,10,25 in the CORELIB.lef file (AMS C35B4 tech). They are all defined as CLASS  CORE ANTENNACELL. For example, definition of FILLANT1 is:

    MACRO FILLANT1
      CLASS  CORE ANTENNACELL ;
      FOREIGN FILLANT1 0.000 0.000 ;
      ORIGIN 0.000 0.000 ;
      SIZE 1.400 BY 13.000 ;
      SYMMETRY X Y  ;
      SITE standard ;
      PIN ANT1
        ANTENNADIFFAREA 1.0 ;
        DIRECTION INPUT ;
        PORT
          LAYER MET1 ;
            RECT 0.250 3.450 1.150 4.350 ;
        END
      END ANT1
      PIN gnd!
        ...
      END gnd!
      PIN vdd!
        ...
      END vdd!
    END FILLANT1 

    If I set "automatic"mode, no diode was added. But if I set cell name to FILLANT1, I can find only one cell of that kind was added to fixed the process antenna violation.

    Any suggestion?

     

    Thanks

    Hoang

     

     

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