Generate X versus Y plot with OCEAN or Skill (example Eyedi

F

Fritz Lange

Guest
Hy,

Does somebody know how to setup a X versus Y Plot in OCEAN or Skill?

I want to generate a Eye diagram automatically
For that I need to plot on the X-Axis a Sawtooth signal instead of the time
axis

I searched in the online help documents, but I found nothing.


Thanks for any help


Best regards

Norman
 
In the Waveform Window, setup the X-axis
to another variable.
I don't remember the exact menu commands
right now but you shouldn't have trouble
doing this.

Using the waveform function you can certainly
do this in skill (awe* functions i guess).

stéphane

"Fritz Lange" <fl@web.de> wrote in message
news:c81uth$9le$1@mamenchi.zrz.TU-Berlin.DE...
Hy,

Does somebody know how to setup a X versus Y Plot in OCEAN or Skill?

I want to generate a Eye diagram automatically
For that I need to plot on the X-Axis a Sawtooth signal instead of the
time
axis

I searched in the online help documents, but I found nothing.


Thanks for any help


Best regards

Norman
Click to expand...
 
Hi Norman,

The first thing to say is that there is an eyeDiagram function in IC50, based on
some code I wrote a while back, which may do what you want.

Secondly, to do an X versus Y in SKILL, you can use:

/*******************************************************************
* *
* (abChangeXAxis yVar xVar) *
* *
* Return a new waveform object with the x axis set to the y values *
* of the second argument. *
* *
*******************************************************************/

(procedure (abChangeXAxis yVar xVar)
(let (newWave)
(setq newWave (drCreateEmptyWaveform))
(drPutWaveformXVec newWave (drGetWaveformYVec xVar))
(if (eq (drGetWaveformXVec yVar) (drGetWaveformXVec xVar))
/* if the x axes are the same for both, it's simple */
(drPutWaveformYVec newWave (drGetWaveformYVec yVar))
/* otherwise need to use value() to interpolate */
(let (xVec yVec len)
(setq xVec (drGetWaveformXVec xVar))
(setq len (drVectorLength xVec))
(setq yVec (drCreateVec (drGetWaveformYType yVar) len))
(for ind 0 (sub1 len)
(drAddElem yVec (value yVar (drGetElem xVec ind)))
)
(drPutWaveformYVec newWave yVec)
)
)
newWave
)
)

Regards,

Andrew.

On Fri, 14 May 2004 10:10:44 +0200, "Fritz Lange" <fl@web.de> wrote:

Hy,

Does somebody know how to setup a X versus Y Plot in OCEAN or Skill?

I want to generate a Eye diagram automatically
For that I need to plot on the X-Axis a Sawtooth signal instead of the time
axis

I searched in the online help documents, but I found nothing.


Thanks for any help


Best regards

Norman
Click to expand...
--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd
 
Hi Andrew,

Unfortunately I don't have the possibility to work with IC50.

But your SKILL function is maybe the beginning of a solution to my problem.

I works very well when I use normal waveform expressions like

XPLOTVAL= v("/XOUT")
YPLOTVAL=v("/SIGNALOUT")
plot(abChangeXAxis(YPLOTVAL XPLOTVAL) )

for example

But when I try to use your procedure in combination with the clip function
like

XPLOTVAL= clip(v("/XOUT") 400n 1u)
YPLOTVAL=clip(v("/SIGNALOUT") 400n 1u)
plot(abChangeXAxis(YPLOTVAL XPLOTVAL) )

it doesn't work anymore

I tried to puzzle out how to fix your routine to get it working with the
clip command, but I lack of the know-how in SKILL programming to do this in
an acceptable time.

To you have a clue?

Best regards

Norman



"Andrew Beckett" <andrewb@DELETETHISBITcadence.com> schrieb im Newsbeitrag
news:f39aa0pk43s41hli9btfplf44aokajvm7o@4ax.com...
Hi Norman,

The first thing to say is that there is an eyeDiagram function in IC50,
based on
some code I wrote a while back, which may do what you want.

Secondly, to do an X versus Y in SKILL, you can use:

/*******************************************************************
* *
* (abChangeXAxis yVar xVar) *
* *
* Return a new waveform object with the x axis set to the y values *
* of the second argument. *
* *
*******************************************************************/

(procedure (abChangeXAxis yVar xVar)
(let (newWave)
(setq newWave (drCreateEmptyWaveform))
(drPutWaveformXVec newWave (drGetWaveformYVec xVar))
(if (eq (drGetWaveformXVec yVar) (drGetWaveformXVec xVar))
/* if the x axes are the same for both, it's simple */
(drPutWaveformYVec newWave (drGetWaveformYVec yVar))
/* otherwise need to use value() to interpolate */
(let (xVec yVec len)
(setq xVec (drGetWaveformXVec xVar))
(setq len (drVectorLength xVec))
(setq yVec (drCreateVec (drGetWaveformYType yVar) len))
(for ind 0 (sub1 len)
(drAddElem yVec (value yVar (drGetElem xVec ind)))
)
(drPutWaveformYVec newWave yVec)
)
)
newWave
)
)

Regards,

Andrew.

On Fri, 14 May 2004 10:10:44 +0200, "Fritz Lange" <fl@web.de> wrote:

Hy,

Does somebody know how to setup a X versus Y Plot in OCEAN or Skill?

I want to generate a Eye diagram automatically
For that I need to plot on the X-Axis a Sawtooth signal instead of the
time
axis

I searched in the online help documents, but I found nothing.


Thanks for any help


Best regards

Norman


--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd
Click to expand...
 
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