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No supermaster is created

mantang

Hi

From pcell library tpPcell (I do not have write permission) , I instantiated pcell A in Cell X and  pcell B in Cell Y in stdcellLib . Then I create a top level cell "DRC_TOP" by placing Cell X and Cell Y using  SKILL code "CCFplaceAllnstances" (obtained from this community 1 year ago). I got the following error code (DB-27000) and no supermaster is created. What is supermaster ? Why do I get this warning message ? Although I could place Cell X and Cell Y in DRC_TOP successfully, I try to understand why the SKILL code wants to create supermaster and the purpose of the supermaster ?

CCFplaceAllInstances(?libName "stdcellLib" ?viewName "layout" ?columns 20
   ?spacing 2.0 )

\w *WARNING* (DB-260014): dbOpenBag: Library tpPcell: cannot upgrade library access from read to write.
\w *WARNING* (DB-260014): dbOpenBag: Library tpPcell: cannot upgrade library access from read to write.
\w *WARNING* Parameter 'layer1' already exists.
\w *WARNING* Parameter 'layer2' already exists.
\w *WARNING* Parameter 'w1' already exists.
\w *WARNING* Parameter 'l1' already exists.
\w *WARNING* Parameter 's1' already exists.
\w *WARNING* Parameter 'samepattern' already exists.
\w *WARNING* Parameter 'discription1' already exists.
\w *WARNING* Parameter 'w2' already exists.
\w *WARNING* Parameter 'l2' already exists.
\w *WARNING* Parameter 'errpattern' already exists.
\w *WARNING* Parameter 'discription2' already exists.
\w *WARNING* Parameter 'overlap' already exists.
\w *WARNING* (DB-260014): dbOpenBag: Library tpPcell: cannot upgrade library access from read to write.
\o Loading pCellGen.cxt
\w *WARNING* (DB-270000): dbOpenCellViewByType: Cannot obtain write access for library tpPcell to access design database: library has read access.
\w *WARNING* Pcell evaluation failed. No supermaster was created.
\e *Error* dbPurge: argument #1 should be a database object (type template = "d") - nil
\w *WARNING* (DB-270000): dbOpenCellViewByType: Cannot obtain write access for library tpPcell to access design database: library has read access.

Thanks,

MC

Parents
  • Andrew Beckett

    My guess is that the pPcell library has a libInit.il file which is loading SKILL code that is performing a pcDefinePCell to recreate the pcell. I checked the code, and this message is produced within the pcDefinePCell function, and unless you're calling that yourself (which doesn't seem to be the case), it's likely to be what I say.

    This means that whoever created the tpPcell library has done it incorrectly.

    Regards,

    Andrew.

  • mantang
    in reply to Andrew Beckett

    Hi Andrew,

    Thank you for your information.

    What is the correct way to fix the problem in pPcell library? I do not believe that changing write permission is the correct way.  

    Thanks,

    ManChak

  • Andrew Beckett
    in reply to mantang

    Hi ManChak,

    Changing the permissions is not the right answer. You need to ensure that tpPcell's libInit.il does not call code that calls pcDefinePCell. When you define a PCell this way, the code is stored within the cellView for the pcell (this is the "supermaster") and it does not need to be recreated each time you start Virtuoso. The only things that needed to be loaded each time are any custom functions which are called from within the body of the pcDefinePCell call. 

    So it's a matter of modifying the startup file (libInit.il) for this library to stop it doing the wrong thing.

    Regards,

    Andrew

  • mantang
    in reply to Andrew Beckett

    Hi Andrew,

    Thank you for your help. I saw pdDefinePCelll skill code is loaded by the commands in libInit.il. I will check with the original author of this pcell library.

    Thanks,

    ManChak

Reply
  • mantang
    in reply to Andrew Beckett

    Hi Andrew,

    Thank you for your help. I saw pdDefinePCelll skill code is loaded by the commands in libInit.il. I will check with the original author of this pcell library.

    Thanks,

    ManChak

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