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Gated flop count

kazad

Hi

I am trying to get the no. of gated flop count within Encounter.

Can anyone throw any idea/procedure on this?

Thanks

Khandaker

  • sizeof_collection [get_cells -hier -filter " is_integrated_clock_gating_cell == true"]

  •  Hi Khandaker,

     

    I think this is what you want

        unset -nocomplain designMetrics

       dbForEachCellInst [dbHeadTopCell] inst {

            if {[dbIsInstStdCell $inst] && [dbIsCellSequential $cell]} {
                set designMetrics(seqArea) [expr $designMetrics(seqArea) + ${instArea}]
                incr designMetrics(seqCount)
            }
        }

     

    good luck,

    gh-

  • proc GateFlopCnt { } {
    set x  [get_cells -hier  -filter  " is_integrated_clock_gating_cell == true"]
    set cnt 0
    foreach_in_collection y $x {
           set inst [filter_collection [all_fanout -from [get_object_name $y]/Q -endpoints_only] { is_integrated_clock_gating_cell == true }]
            foreach_in_collection i $inst {
                     incr cnt
                  }
          }
    puts "$cnt"
    }


    Misread the question earlier sorry about that.Let me know if you think the logic is skewed.

  • Hi Gh

    This gives all the sequential elements in the design. But I after the flops those clock nets are coming from the clock-gating cell outputs.

    Thanks

    Khandaker

     

     

  • Minor modification : instead of "set inst [filter_collection [all_fanout -from [get_object_name $y]/Q -endpoints_only] { is_integrated_clock_gating_cell == true }] " we should be using as the above was assigning only the clock gating cell. set inst [filter_collection [all_fanout -from [get_object_name $y]/Q -only_cells] { is_integrated_clock_gating_cell == false && is_sequential == true }]

  • Hi Vinshu

    Thanks very much for the procedure. It really helped my need.

    Cheers

    Khandaker

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