Tracing a net

If you are running Cadence 6.1.4 and the nets are not that big (not supply nets), then you can use Connectivity->Nets->Mark Net, and then use Connectivity->Nets->Save All Mark Nets  to save the results to a cell. You could then plot the new cell.

Derek

Hi Derek,

I'd really like to say that I'm using Cadence 6.x!  Well, that is not exactly true.  Do you have any ideas on making this work in Cadence <6.x? (5.1.x)  THANKS!

John Wilwert 

Actually, we are still using 5.1.41.x and don't know when we'll be on 6.1.x. I just happen to know about that particular feature and knew it would be easier than a new ruledeck for Assura. We use a third party verification tool to extract our supply nets for separate viewing/plotting. Unfortunately, I can't help you with Assura.

Derek

Hi John

Perhaps you can code something similar to:

drcExtractRules(
   layerDefs( "df2"
      m1=layer("Metal1")
      m1Pins=textToPins("Metal1")
      ...
   ) ;layerDefs

   geomConnect(
      via( cont m1 poly psub ... )
      label( m1Pins m1 )
   ) ;geomConnect

   vddM1=geomGetNet(m1 "VDD")
   vddM2=geomGetNet(m2 "VDD")
   ...
   vddM8=geomGetNet(m8 "VDD")
) ;drcExtractRules

Now open drc and set avParameters ?outputErrorLib to "Output Error Lib". In "View Additional Functions" secton of the drc form, please select "Create New Layout Database". In the outFile form, save lvs layer "vddM1" ... "vddM8" to the actual DFII layers. Now run drc. You will get a new library with the vdd net.

Best regards
Quek 

Quek,

Thanks for jumpimg in on this - I really appreciate the help.

Everything looks good.  I am down to the part:

In the outFile form, save lvs layer "vddM1" ... "vddM8" to the actual DFII layers.

How (and where) do I do this?  I am stopped cold on this part.  Any thoughts?

Again, THANK YOU!

John Wilwert 

Hi John

Here are the steps:

In the outFile form, please do the following:
a. Fill in the name of a new library
b. Enter a path for the new libary
c. Enter the name of the tech library
d. For "Assura layer name", enter the name of the layer that appears in the rules file
e. For "Layer name", enter the name of the layer that appears in LSW
f. Add the layer to the text box
g. Repeat for all other layers

Please see the sample below. : )

Best regards
Quek

Quek

Thanks - So how do I get to this form?  Where can I find it?

Also, I suspoect that this form writes or appends a file somewhere.   Maybe, I could just write or append the file.

Thanks,

John Wilwert 

Hi John

At the end of the lvs form, please enable "View Additional Function". Then enable "Create New Database" option and press the button.


Best regards
Quek

Quek,

Thanks - I found the form and followed it through.

 I guess I need to back up a little and clearify a point.  The net I need to plot may be any net a designer chooses.  So it may ot may not have a pin on it.  In the past, I've just placed an "X" on the net using the TEXT.drawing layer.  It think this slightly changes the code above.  Could you help me  get this coding correct?  Sorry for this oversight.

Thanks,

John Wilwert 

Hi John

Please use this:

layerDefs( "df2"
   myText=text("TEXT")
   ...
)

geomConnect(
   ...
   label(myText m1)
   ...
)

The above would create net labels instead of pin labels.

Best regards
Quek