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Identifying the fixed cells inthe design

vicky

 Hi,

I would like to know what is the fastest way to identify all the fixed cells in the design. I donot want to loop through all the instances in the design and query for the placement status as it will take huge run times for bigger testcases.

 

Regards

Viijay

  • Hi Vijay,

    I don't think we have a natively defined command that identifies all of the fixed instances in the design, but I think the best solution for you depends on *how* you would like these instances identified.  Do you want a tcl list? A text report? Would you like the tool to select them for further manipulation?

    It shouldn't take too long to loop through all of the instances, even on a big design.  Could you try these options out and let us know what you think of them?

    Option 1: dbGet

    dbGet [dbGet -p top.insts.pStatus fixed].name

    Option 2: FE-TCL

    dbForEachCellInst [dbHeadTopCell] inst {
      if {[dbIsInstPreplaced $inst]} {
        Puts "[dbInstName $inst]"
      }
    }

    Option 3: Use "Edit->Find/Select Object"

    This GUI allows for selection by filter, and maps to:

    selectObjByProp Instance <Status>=<Fixed>

    Hope this helps,
    Bob

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