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how to write a SKILL code for PCELL powergrid

techrddyz

Hi all,

I am new to SKILL coding. I am trying to create a power grid PCELL using SKILL. The user can switch on and off layers/vias depending on needs. I found some SKILL code online and modified to meet my need. Now, i can create metals (ex. M3) but I dont know how i can turn it on and off when the user checks on/off the checkbox on the 'Edit Instance Properties' window. please see my code below. 

procedure(powerGridPcell(cv "dnn")
let( (rectRodObj)

Nx=7
temp = 1
for(i 0 Nx
temp = 0.63 * i
rectRodObj = rodCreateRect(
?cvId cv
?layer list("M3" "drawing")
?bBox list(0:temp+0.125 5.04:temp+0.505)
)
);End for i

); let
); procedure


;; Create the PCell, the "drawing routine" is encapsulated in the
;; powerGridPcell function which does all the work

pcDefinePCell(
list(ddGetObj("test_rudy") "power_grid_pcell" "layout")
(
)
let( ((cv pcCellView))
powerGridPcell(cv)
); let
)

;; Create the CDF for the 'l' and 'w' parameters
let( (cellId cdfId)
when(cellId = ddGetObj("test_rudy" "power_grid_pcell")
;; if the cell CDF already exists, delete it
when( cdfId = cdfGetBaseCellCDF(cellId)
cdfDeleteCDF(cdfId)
)
;; create the base cell CDF
cdfId = cdfCreateBaseCellCDF(cellId)
;; create the parameters
cdfCreateParam( cdfId
?name "visibilityM3"
?prompt "M3"
?defValue "true"
?type "boolean"
?display "t"
)

cdfSaveCDF(cdfId)
); when
); let

Thanks

  • Hi Lawrence,

    sorry about that. please find below my code with the 'when' condition added around the powerGridPcell_via() function

    ;; Create the PCell, the "drawing routine" is encapsulated in the
    ;; powerGridPcell function which does all the work
    pg_layer_list = list(
    list("M1")
    list("M2" "V1")
    )
    coordIndex = 1
    ;;create metal layers
    procedure(powerGridPcell_metal(cv drawMetal rowCol metalLayer)
      let( (rectRodObj)
          for(i 0 rowCol
    if(drawMetal == t
     case(metalLayer
        ("M1"
        coordIndex = 0.63 * i
        rectRodObj = rodCreateRect(
    ?cvId    cv
    ?layer   list(metalLayer "drawing")
    ?bBox    list(0:coordIndex+0.125 5.04:coordIndex+0.505)
        )
        )
    ("M2"
        coordIndex = 0.63 * i
        rectRodObj = rodCreateRect(
    ?cvId    cv
    ?layer   list(metalLayer "drawing")
    ?bBox    list(coordIndex+0.125:0 coordIndex+0.505:5.04)
        )
        )
      );case
    ); if
          );End for i
      ); let
    ); procedure
    ;create vias
    procedure(powerGridPcell_via(cv v_layer row col v_xStart1 v_yStart1 v_xStart2 v_yStart2 v_xPitch v_yPitch v_w v_l v_row v_col rowPitch colPitch)
       for(i 0 row ;row
          for(j 0 col ;col
    if(mod(j 2) == 0 && mod(i 2) == 0 then
    tempx1 = colPitch * (j/2) + v_xStart1
    tempy1 = rowPitch * (i/2) + v_yStart1
    dbCreateViaShapeArray(cv v_layer nil tempx1 tempy1 v_xPitch v_yPitch v_w v_l v_row v_col)
    else
    tempx1 = colPitch * (j/2) + v_xStart2
    tempy1 = rowPitch * (i/2) + v_yStart2
    dbCreateViaShapeArray(cv v_layer nil tempx1 tempy1 v_xPitch v_yPitch v_w v_l v_row v_col)
    );if
          );for
       );for
    )
    pcDefinePCell(
      list(ddGetObj("test_rudy") "power_grid_pcell_test" "layout")
      (
    (M1 t)
    (V1 t)
    (M2 t)
      )
      let( ((cv pcCellView))  
    powerGridPcell_metal(cv M1 7 nth(0 nth(0 pg_layer_list)))
    powerGridPcell_metal(cv M2 7 nth(0 nth(1 pg_layer_list)))
         when(V1
    powerGridPcell_via(cv nth(1 nth(1 pg_layer_list)) 7 7 0.195 0.195 0.825 0.825 0.16 0.16 0.08 0.08 2 2 1.26 1.26)       ;V1
         );when
      ); let
    )
    ;; Create the CDF 
    let( (cellId cdfId)
      when(cellId = ddGetObj("test_rudy" "power_grid_pcell_test")
        ;; if the cell CDF already exists, delete it
        when( cdfId = cdfGetBaseCellCDF(cellId)
          cdfDeleteCDF(cdfId)
        )
        ;; create the base cell CDF
        cdfId = cdfCreateBaseCellCDF(cellId)
        ;; create the parameters
        cdfCreateParam( cdfId
          ?name    "M1"
          ?prompt  "M1"
          ?defValue    "true"
          ?type    "boolean"
          ?display    "t"
        )
        cdfCreateParam( cdfId
          ?name    "V1"
          ?prompt  "V1"
          ?defValue    "true"
          ?type    "boolean"
          ?display    "t"
        )
        cdfCreateParam( cdfId
          ?name    "M2"
          ?prompt  "M2"
          ?defValue    "true"
          ?type    "boolean"
          ?display    "t"
        )
        
        cdfSaveCDF(cdfId)
      ); when
    ); let

  • Rudy,

    For various strange historical reasons, you should assume that boolean parameter values are either t/"TRUE" or nil/"FALSE". What's happening in this case is that V1 ends up being "FALSE" when you turn it off and since you're just using when(V1...   it's still executing the branch (because "FALSE" is non-nil and hence is true). So best to be complete:

    when(V1==t || V1=="TRUE"
    ...
    )

    If you do that, it works fine. I'd do the same for your M1/M2 switches too elsewhere in the code.

    Regards,

    Andrew.

  • Thanks Andrew and Lawrence. adding V1==t || V1=="TRUE" works great.

    Rudy
  • in reply to techrddyz

    Hi, can anyone please help me with achieving the same pwrgrid pcell using the graphical method of creating a pcell. I want to be able to turn ON and turn OFF specific metal layers and vias. I was able to create the parameter boxes that can be checked/unchecked( in the instance property form). From the Pcell plugin, I dropped down to parameterized layers--> Define. And then I set them to be boolean using Parameters-> Edit.

    But checking or unchecking the boxes has no effect on the visibility. I know I need to define something more, but don't know what and how to.

    Can you please help me? I appreciate any help on this.

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