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overlapping polygon checking command in encounter

vicky

 I would like to know is there a command that checked for polygon overlap. I need to check the overlap of a instance box with a power domain which is non rectangular in shape. I am trying to use this command "dbIsBoxOverlappingBox" which does not always give me the overlap correctly.

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  • Hi Vicky,

    Sorry for the delayed response on this one.  It slipped through the cracks, but in case you or anyone else is interested in a solution to this question, here is a way to get the boxes for a rectilinear power domain and check which instances in the design are within that rectilinear box:

    set pd [dbGetPowerDomainByName PDpll]
    set group [dbPowerDomainGroup $pd]
    dbForEachGroupBoxListBox $group box {
      set boxPtr [dbBoxPtrBox $box]
      dbForEachCellInst [dbHeadTopCell] inst {
        set instBox [dbInstBox $inst]
        if {[dbIsBoxOverlappingBox $boxPtr $instBox]} {
          Puts "inst: [dbInstName $inst] is overlapping"
        }
      }
    }

    I was going to show a dbGet-style implementation of similar, but I found a couple of limitations in the dbGet schema which limit it from being useful in this case.  I'll work with our developers on a making this easier with a couple of enhancements.  For now, I hope this example is helpful.

    Thanks,
    Bob

Reply

  • Hi Vicky,

    Sorry for the delayed response on this one.  It slipped through the cracks, but in case you or anyone else is interested in a solution to this question, here is a way to get the boxes for a rectilinear power domain and check which instances in the design are within that rectilinear box:

    set pd [dbGetPowerDomainByName PDpll]
    set group [dbPowerDomainGroup $pd]
    dbForEachGroupBoxListBox $group box {
      set boxPtr [dbBoxPtrBox $box]
      dbForEachCellInst [dbHeadTopCell] inst {
        set instBox [dbInstBox $inst]
        if {[dbIsBoxOverlappingBox $boxPtr $instBox]} {
          Puts "inst: [dbInstName $inst] is overlapping"
        }
      }
    }

    I was going to show a dbGet-style implementation of similar, but I found a couple of limitations in the dbGet schema which limit it from being useful in this case.  I'll work with our developers on a making this easier with a couple of enhancements.  For now, I hope this example is helpful.

    Thanks,
    Bob

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