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Other CAD Tools >> Physical Verification, Extraction and Analysis >> Assura LVS unbound pin problem
https://designers-guide.org/forum/YaBB.pl?num=1191995096

Message started by skylerweaver on Oct 9^th, 2007, 10:44pm

Title: Assura LVS unbound pin problem
Post by skylerweaver on Oct 9^th, 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

Title: Re: Assura LVS unbound pin problem
Post by bernd on Oct 10^th, 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

Title: Re: Assura LVS unbound pin problem
Post by didac on Oct 10^th, 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.