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Assura LVS unbound pin problem (Read 9207 times)
skylerweaver
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Assura LVS unbound pin problem
Oct 09th, 2007, 10:44pm
 
I am trying to verify my layout with Assura and everything passes with the exception of pins:

"Pins  8 || 0"

I have read on here that this is common and can be fixed by placing a label on a shape and then Create > Pins from labels...
but this still doesn't work.

The error log says that all of the pins are unbound. Thus Assura can't see them. They are all on Metal 1 and 2.



If it helps, I am working with JAZZ 0.18um
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bernd
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Re: Assura LVS unbound pin problem
Reply #1 - Oct 10th, 2007, 2:22am
 
This basically results that your Assura extract.rul did not recognized the way you draw your pins in the layout editor.

Is there a design manual for your design kit, which probably explains how to
draw the pins that Assura can recognize it?

It would help to know:
- On which database you run your LVS check on Cadence DFII or GDSII?
- How and with which layers do you usually draw your pins in the layout editor?
- How does your pin recognition section in the Assura extract.rul file look
 like?


My Assura code looks like follows:

;; Create labels form DFII pins
         m1_text      = pinText( "METAL1" )
     ...
;; Pin creation for GDSII
     m1_text        = textToPin( 131 type(  0 ) )

;; Establish/Extract connectivity section
geomConnect(
     ...
     label( m1_text m1 )
     ...
) ;; close geomConnect


This allows me to draw pins in the layout editor with the
'Create -> Pin' command on the metal layer of the interconnect
and realizes pins in GDSII if the interconnect has a label, which
can be added by 'Create -> Pin' as well.

There is also an old thread discussing this issue. http://www.designers-guide.org/Forum/YaBB.pl?num=1160022166

Bernd
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didac
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things in life

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manresa,spain
Re: Assura LVS unbound pin problem
Reply #2 - Oct 10th, 2007, 6:54am
 
Hi,
I agree with bernd, I've worked with three PDK's of three different foundries and in each one you should draw the pins and labels different so ASSURA can recognize the pins,better check your foundry documentation or contact directly to the foundry.
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