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Different instances reference different masters

MichaelKoch

I have a layout with multiple instances of the same cell (libName, cellName, viewName). 

However some of the instances refer to the same master css()~>master and some not.

Looking at the master most of the properties are the same, with the exception of addresses/pointers which are completely different 

and the css()~>modifiedCounter. 

I already found the post called Re: instance->master != dbOpenCellViewByType() but those instances don't seem to have a

superMaster.

The original task was to creep through a design hierarchically, which I would want to do by collecting all the instance masters and then 

crawling through those instead of repeatedly crawling through the masters of all the instances. 

 

Please see the code below to collect all the masters in a table, counting the times these masters were referenced.

    l_insts=sCV~>instances
    t_instType=makeTable("instType" 0)
    foreach(inst l_insts
      printf("  inst~>master %L inst~>master~>superMaster %L %d\n"
         inst~>master inst~>master~>superMaster t_instType[inst~>master])
      t_instType[inst~>master]=t_instType[inst~>master]+1
    )
    foreach(instType t_instType
      printf("  Would check %-30s / %-30s / %-30s %L %d occurences\n"
               instType~>libName instType~>cellName instType~>viewName instType t_instType[instType])
      ; bppCheckVias(list(instType~>libName instType~>cellName instType~>viewName) quiet)
    )

 The output in question looks like: 

 ...

  Would check rbc22s                         / cr_invert_e_h                  / layout                         db:0x1c2b501a 1 occurences
  Would check rbc22s                         / cr_invert_e_h                  / layout                         db:0x1c2b691a 1 occurences
  Would check rbc22s                         / cr_invert_e_h                  / layout                         db:0x1c2b741a 2 occurences

...

  • Andrew Beckett

    Michael,

    If the master does not have a superMaster, perhaps you can try doing:

    dbCheck(sCV)
    dbFix(sCV)

    maybe the instHeaders have got messed up - this can happen if something was once a pcell, but is no longer a pcell. Pretty rare though...

    Otherwise, you should log a service request so somebody in Cadence can look at the data.

    Regards,

    Andrew.

     

  • MichaelKoch

     I was wrong.Either the instances have superMasters or refer to the same master.

    Please close. 

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