Schematic terminals location and position for automated routing.

Hi,

 I am trying to create a testchip schematic from a inputfile. But i am facing a small problem.

i.e when i am trying to find the loaction of the terminals whether they are  top , bottom, left , right .. some times it is working . but some times it is giving nil. which i don't understand at all. Instead of beating around the bush i am trying to find an alternate solution.

 Here is the sample code that i am trying to creat for a single instance.

 /**

SchConnectivity("Marvel8_testchips" "SingleCell" "padlib_m6p50derclrev18" "PGB_CSEA_CMGPxA_DxAA_BxL")

**/

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Procedure 1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
procedure( SchConnectivity(templibName tempcellName sourcelibName sourcecellName "tt")
  let( (masterId x y cvId instTermBbox instTermBboxInCv
        instTermLLX instTermLLY instTermURX instTermURY
        wireOriginX wireOriginY wireSpace wireWidth wireLength
        deltaX deltaY wireLabel wireOrientation wireJustification
        wireEndX wireEndY termWire Loc_x Loc_y Inst_num  cells  direction
        accessdirection 
  )

;; Opening the Created Cell View ;;

cvSinglecell = dbOpenCellViewByType(templibName tempcellName "schematic" "" "a")
geOpen(    ?lib   "Marvel8_testchips"
        ?cell  "SingleCell"
        ?view  "schematic"
        ?mode  "a"
        )

/*************************************************************************
; symbolId = dbOpenCellViewByType( "ifxbasic" "c_term" "symbol" "" 'r )
; instId = schCreateInst( cvSinglecell  symbolId "I23" -10:5 "R0" )
*************************************************************************/

;; Deleting all the content in the present Cell View
schSelectAllFig( cvSinglecell )
schHiDelete()

Loc_x = 0
Loc_y = 0

cells = 1000
Inst_num = sprintf(nil "IN%d" cells)
symbolId2 = dbOpenCellViewByType( sourcelibName sourcecellName "symbol" "" 'r )
instId2 = schCreateInst( cvSinglecell  symbolId2  Inst_num   Loc_x:Loc_y "R0" )
dbClose(symbolId2)
dbSave(cvSinglecell)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

    x=1
    y=1
    wireSpace=0.0625
    wireWidth=0
    wireLength=0.6
    cterm_num = 0

Instance_BBox = cvSinglecell~>instances~>bBox
println(Instance_BBox )
foreach( inst cvSinglecell~>instances
      printf( "Instance : %s\n" inst~>name )
      ; Print all the Instance terminals for each instance found
      ; in the CV.
      foreach( instTerm inst~>instTerms
          ; For each instance terminal, i.e D-S-B-G, get the bbox
          ; of the  terminal's little square then use dbTransformBBox
          ; to transform the pin bbox to the cellview
          instTermBbox=car(instTerm~>term~>pins~>fig~>bBox)
          instTermBboxInCv=dbTransformBBox(instTermBbox
                           inst~>transform)
          printf( " Instance Terminal= %s : absBbox=%L :
                  relBbox=%L\n" instTerm~>name
          instTermBbox instTermBboxInCv)
          ; get the X/Y coordinates from the BBOX
          instTermLLX=xCoord(lowerLeft(instTermBboxInCv))
          instTermLLY=yCoord(lowerLeft(instTermBboxInCv))
          instTermURX=xCoord(upperRight(instTermBboxInCv))
          instTermURY=yCoord(upperRight(instTermBboxInCv))
          wireOriginX=(instTermLLX+instTermURX)/2
          wireOriginY=(instTermLLY+instTermURY)/2
       
    ;; Reading the lable

direction =    instTerm~>term~>pins~>accessDir
    accessdirection = caar(direction)
     println(accessdirection)

        case(lowerCase(accessdirection)
            ("top"
              deltaX=0
              deltaY=wireLength
              wireLabel="Drain"
              wireOrientation="R270"
              wireJustification="lowerRight"
            )
            ("bottom"
              deltaX=0
              deltaY=-wireLength
              wireLabel="Source"
              wireOrientation="R90"
              wireJustification="lowerLeft"
            )
            ("right"
              deltaX=wireLength
              deltaY=0
              wireLabel="Bulk"
              wireOrientation="R180"
              wireJustification="lowerRight"
            )
            ("left"
              deltaX=-wireLength
              deltaY=0
              wireLabel="Gate"
              wireOrientation="R0"
              wireJustification="lowerLeft"
            )
            ("nil"
              printf("cannot access direction !!! \n")
            )
          )

        wireEndX=wireOriginX+deltaX
        wireEndY=wireOriginY+deltaY

        ; Create the wire
          termWire=schCreateWire(cvSinglecell "draw" "full"
          list(wireOriginX:wireOriginY wireEndX:wireEndY)
          wireSpace wireSpace wireWidth)
        ; Create the Label
        schCreateWireLabel(cvSinglecell car(termWire)
                             wireEndX:wireEndY wireLabel
                              wireJustification wireOrientation
                              "fixed"  wireSpace nil)

        ; Create the c_term
        cterm_num = cterm_num  +1
        ctermInst_num = sprintf(nil "IN%d" cterm_num)
        ctermid = dbOpenCellViewByType( "ifxbasic" "c_term" "symbol" "" 'r )
        ctermID2 = schCreateInst( cvSinglecell  ctermid   ctermInst_num  wireEndX:wireEndY wireOrientation )
        dbClose(ctermid)

       
        ) ; foreach
    ) ; foreach

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
dbSave(cvSinglecell)
dbClose(cvSinglecell)
)
)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; END OF Procedure 1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 

 If you see the above script ther is a line

direction =    instTerm~>term~>pins~>accessDir

from where i get which side the terminal is located.

But it doesn't work for every thing. Please let me know if you know any other way.

With Regards

Kishan VNs