Place instance or Shape on any angle in Cadence

Discussion in 'Cadence' started by vtcad, Jul 31, 2007.

  1. vtcad

    vtcad Guest

    I'm looking for a skill routine to place either an Instance or Set of
    shapes at any specified angle (will be used for placing die inside
    package at an angle), is there any code out there already.

    thanks for the help,
     
    vtcad, Jul 31, 2007
    #1
  2. The attached SKILL code was written for OA-enabled versions of the tools (e.g.
    IC61) to illustrate how to rotate cells to arbitrary angles. It should also work
    with IC5141 if you remove the stuff at the end which uses dbCreateMarker()
    (since that function doesn't exist in CDB).

    The idea is that it creates a pcell called "rotator", which you provide the lib,
    cell, view, angle and magnification of the cell you want to place at an
    arbitrary angle and magnification when you instantiate rotator.

    Regards,

    Andrew.

    ;------------------------------------------------------------------------
    ; This example illustrates how to implement a generic instance
    ; rotator with arbitrary angles.
    ;
    ; The code may not fully handle connectivity.
    ;
    ; If the master changes after the pcell has been evaluated, that will
    ; not be immediately reflected, as that would not trigger a pcell
    ; re-evaluation.
    ;
    ; This code is not intended to rotate pcells - that is best handled
    ; in the pcell itself, using the dbTransformCellView() function directly.
    ; If a pcell is rotated, only the default pcell parameters will be used.
    ;
    ; Andrew Beckett and Gilles Lamant
    ; 17th January 2006
    ;------------------------------------------------------------------------

    pcDefinePCell(
    list(ddGetObj("mylib") "rotator" "layout")

    ;----------------------------------------------------------------
    ; Formal parameters
    ;----------------------------------------------------------------
    (
    (angle 0.0)
    (magnification 1.0)
    (lib "")
    (cell "")
    (view "")
    (nsides 16)
    )

    ;----------------------------------------------------------------
    ; Code itself
    ;----------------------------------------------------------------
    let((inst master success)
    ;----------------------------------------------------------------
    ; Do some sanity checking to ensure the placed cellView exists
    ;----------------------------------------------------------------
    when(ddGetObj(lib cell view)
    master=dbOpenCellViewByType(lib cell view)
    when(master
    ;--------------------------------------------------------
    ; Create the instance and then flatten it to 32 levels
    ; of hierarchy
    ;--------------------------------------------------------
    inst=dbCreateInst(pcCellView master "" 0:0 "R0")
    dbFlattenInst(inst 32 t t)
    ;--------------------------------------------------------
    ; Some shape types (ellipses) do not rotate as expected,
    ; so need to convert them to polygons
    ;--------------------------------------------------------
    foreach(shape pcCellView~>shapes
    case(shape~>objType
    ("ellipse" dbConvertEllipseToPolygon(shape nsides))
    )
    )
    dbCreateLabel(pcCellView "text" 0.0:0.0
    sprintf(nil "Ang:%g Mag:%g" angle magnification)
    "lowerLeft" "R0" "stick" 1.0)
    ;----------------------------------------------------------------
    ; Transform the whole cellView, using an arbitrary magnification
    ; and angle
    ;----------------------------------------------------------------
    dbTransformCellView(pcCellView magnification angle)
    success=t
    ) ; when
    ) ; when
    ;----------------------------------------------------------------
    ; Place a marker if the cellView cannot be opened
    ;----------------------------------------------------------------
    unless(success
    getWarn()
    dbCreateMarker(
    pcCellView
    sprintf(nil "Cellview %L/%L/%L cannot be opened" lib cell view)
    "pcellRotator"
    list(0:0 0:1 1:1 1:0)
    nil
    t t "error"
    ) ; dbCreateMarker
    ) ; unless
    ) ; let
    ) ; pcDefinePCell
     
    Andrew Beckett, Sep 17, 2007
    #2
Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.