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Generate netlist with subckt statement for top level

Octavian

I'm generating a netlist from CIW using:

simulator('spectre)
design("libName" "cellName" "viewName")
createNetlist()

This works fine but I would like to enclose the top level cell in .subckt/ends statements, similar to other cells in the hierarchy. Is that possible using the skill/ocean interface?

 

Thanks,

--Tavi

Parents

  • Hi Tavi,

    How about the code below. Note that if you want to switch it back in the same session, you'd have to do:

    asiSetNetlistFormatterClass(asiGetTool('spectre) 'spectreFormatter)

    Look at the comments at the top to see the function to initialize the alternative formatter which includes the header for the subckt. The IC616 solution that I mentioned below also incorporates the changes needed (with a recent enough MMSIM version) so that the netlist can still be simulated, using a new switch for spectre to tell it the top subckt to simulate, which the solution below doesn't implement. But if you only want it to produce a netlist, this solution should be sufficient.

    Regards,

    Andrew. 

    /* abSpectreTopSubckt.ils

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       May 16, 2006 
Modified   
By         

Defines a new formatter, which adds subckt definition around
top level circuit.

Does this by extending the spectreFormatter. Note we could directly
define methods for the spectreFormatter, since it doesn't define
them itself, but then there is the risk that a future release
might define methods for spectreFormatter - so better to extend
rather than make that assumption.

To install, call (abRegisterSpectreTopCVFormatter)

***************************************************

SCCS Info: @(#) abSpectreTopSubckt.ils 05/16/06.18:06:00 1.1

*/

;------------------------------------------------------------------------
; Need to have these contexts loaded - in the right order - so
; that the spectreFormatter class can be extended
;------------------------------------------------------------------------
(foreach context '("oasis" "asimenv" "analog" "spectrei" "spectreinl")
  (unless (isContextLoaded context)
          (loadContext 
           (prependInstallPath (strcat "etc/context/" context ".cxt")))
          (callInitProc context)
          )
  )

;------------------------------------------------------------------------
; Define the class for the formatter. 
;------------------------------------------------------------------------
(defclass abSpectreTopCVFormatter (spectreFormatter)
  ()
  )

/***************************************************************
*                                                              *
*              (abRegisterSpectreTopCVFormatter)               *
*                                                              *
*              Register the formatter with Artist              *
*                                                              *
***************************************************************/

(defun abRegisterSpectreTopCVFormatter ()
  (let (tool)
       (setq tool (asiGetTool 'spectre))
       (asiSetNetlistFormatterClass tool 'abSpectreTopCVFormatter)
       )
  )


/***********************************************************************
*                                                                      *
* (nlPrintTopCellHeader ((formatter abSpectreTopCVFormatter) cellView) *
*                                                                      *
*    Method for top level header - call the standard subckt header     *
*                                                                      *
***********************************************************************/

(defmethod nlPrintTopCellHeader ((formatter abSpectreTopCVFormatter) cellView)
  (nlPrintSubcktHeader formatter cellView)
  ;----------------------------------------------------------------------
  ; don't want comments twice, so don't call the standard formatter?
  ;----------------------------------------------------------------------
  ; (when (nextMethodp) (callNextMethod))
  )

/***********************************************************************
*                                                                      *
* (nlPrintTopCellFooter ((formatter abSpectreTopCVFormatter) cellView) *
*                                                                      *
*    Method for top level footer - call the standard subckt footer     *
*                                                                      *
***********************************************************************/

(defmethod nlPrintTopCellFooter ((formatter abSpectreTopCVFormatter) cellView)
  (nlPrintSubcktFooter formatter cellView)
  (when (nextMethodp) (callNextMethod))
  )
     

     

Reply

  • Hi Tavi,

    How about the code below. Note that if you want to switch it back in the same session, you'd have to do:

    asiSetNetlistFormatterClass(asiGetTool('spectre) 'spectreFormatter)

    Look at the comments at the top to see the function to initialize the alternative formatter which includes the header for the subckt. The IC616 solution that I mentioned below also incorporates the changes needed (with a recent enough MMSIM version) so that the netlist can still be simulated, using a new switch for spectre to tell it the top subckt to simulate, which the solution below doesn't implement. But if you only want it to produce a netlist, this solution should be sufficient.

    Regards,

    Andrew. 

    /* abSpectreTopSubckt.ils

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       May 16, 2006 
Modified   
By         

Defines a new formatter, which adds subckt definition around
top level circuit.

Does this by extending the spectreFormatter. Note we could directly
define methods for the spectreFormatter, since it doesn't define
them itself, but then there is the risk that a future release
might define methods for spectreFormatter - so better to extend
rather than make that assumption.

To install, call (abRegisterSpectreTopCVFormatter)

***************************************************

SCCS Info: @(#) abSpectreTopSubckt.ils 05/16/06.18:06:00 1.1

*/

;------------------------------------------------------------------------
; Need to have these contexts loaded - in the right order - so
; that the spectreFormatter class can be extended
;------------------------------------------------------------------------
(foreach context '("oasis" "asimenv" "analog" "spectrei" "spectreinl")
  (unless (isContextLoaded context)
          (loadContext 
           (prependInstallPath (strcat "etc/context/" context ".cxt")))
          (callInitProc context)
          )
  )

;------------------------------------------------------------------------
; Define the class for the formatter. 
;------------------------------------------------------------------------
(defclass abSpectreTopCVFormatter (spectreFormatter)
  ()
  )

/***************************************************************
*                                                              *
*              (abRegisterSpectreTopCVFormatter)               *
*                                                              *
*              Register the formatter with Artist              *
*                                                              *
***************************************************************/

(defun abRegisterSpectreTopCVFormatter ()
  (let (tool)
       (setq tool (asiGetTool 'spectre))
       (asiSetNetlistFormatterClass tool 'abSpectreTopCVFormatter)
       )
  )


/***********************************************************************
*                                                                      *
* (nlPrintTopCellHeader ((formatter abSpectreTopCVFormatter) cellView) *
*                                                                      *
*    Method for top level header - call the standard subckt header     *
*                                                                      *
***********************************************************************/

(defmethod nlPrintTopCellHeader ((formatter abSpectreTopCVFormatter) cellView)
  (nlPrintSubcktHeader formatter cellView)
  ;----------------------------------------------------------------------
  ; don't want comments twice, so don't call the standard formatter?
  ;----------------------------------------------------------------------
  ; (when (nextMethodp) (callNextMethod))
  )

/***********************************************************************
*                                                                      *
* (nlPrintTopCellFooter ((formatter abSpectreTopCVFormatter) cellView) *
*                                                                      *
*    Method for top level footer - call the standard subckt footer     *
*                                                                      *
***********************************************************************/

(defmethod nlPrintTopCellFooter ((formatter abSpectreTopCVFormatter) cellView)
  (nlPrintSubcktFooter formatter cellView)
  (when (nextMethodp) (callNextMethod))
  )
     

     

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