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Not able to generate the antenna info for hard blocks

tswong

I've done the steps below to generate the antenna info on abstract generator, but it is fail so far..

1) define the thickness and defaultantenna rule for electricalRules section on techfile.

2) turn on the signal tab of Extract step

3) define "drain" and "gate" for antenna calculation

There is no error message during the generation, but it is still not able to find any antenna information at the exported LEF. I am not sure whether anything is missed. I wonder anyone could give me advise! 

Parents

  • Hi TS

    Sorry for the late reply. I think the recent forum technical issues caused some delays in quite a number of posts.

    No special layer mapping is needed. Check the layerRules section of your Virtuoso techfile. It should contain lines similar to the following:

    layerRules(

     functions(
     ;( layer                       function        [maskNumber])
     ;( -----                       --------        ------------)
      ( Poly                         "poly"          0            )
      ( Oxide                        "ndiff"         1            )
      ( Cont                         "cut"           2            )
      ( Metal1                       "metal"         3            )
    ...


    E.g. if your poly layer is named as "PC" and diffusion layer is named as "RX", then you need to define the following 2 lines in the antenna region box:

    PC and RX = gate
    RX andnot PC = drain

    If "Extract signal nets" is not enabled, please add the following lines to the box for "Layer assignment for antenna extraction":
    PC PC
    RX RX andnot PC
    yourContName yourContName

    If the above still do not work, please go to "File->Export->Options" and upload your options file as an attachment. Thanks.

    Best regards
    Quek

Reply

  • Hi TS

    Sorry for the late reply. I think the recent forum technical issues caused some delays in quite a number of posts.

    No special layer mapping is needed. Check the layerRules section of your Virtuoso techfile. It should contain lines similar to the following:

    layerRules(

     functions(
     ;( layer                       function        [maskNumber])
     ;( -----                       --------        ------------)
      ( Poly                         "poly"          0            )
      ( Oxide                        "ndiff"         1            )
      ( Cont                         "cut"           2            )
      ( Metal1                       "metal"         3            )
    ...


    E.g. if your poly layer is named as "PC" and diffusion layer is named as "RX", then you need to define the following 2 lines in the antenna region box:

    PC and RX = gate
    RX andnot PC = drain

    If "Extract signal nets" is not enabled, please add the following lines to the box for "Layer assignment for antenna extraction":
    PC PC
    RX RX andnot PC
    yourContName yourContName

    If the above still do not work, please go to "File->Export->Options" and upload your options file as an attachment. Thanks.

    Best regards
    Quek

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