Designer’s Guide Community

zychang

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Posts: 13
Ireland

question on Assura LVS check
Feb 06^th, 2006, 1:50pm

Hi all,

I just found a problem when i was doing LVS check using Assura. the error report shows the pins are not matched. it seems that all the pins i made in the layout cannot be recognized by Assura because the error report shows that there is no pin in the layout. The pins I use are the met-pin and poly-pin. I have tried the symbolic pin and shape pin and I also tried the MET1-dg and MET1-pn layers for them, but none of them seems working. I have no idea what's going on right now. any comments will be appreciated.

p.s. the design passed the LVS check when I was using DIVA in a previous Cadence and hit-kit. For some reasons, I have to upgrade to AMS hit-kit 3.70 and a new version of Cadence (Virtuoso Layout Editor 5.10.41) but the diva rule file doesn't work here. That's why I am using Assura now.

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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: question on Assura LVS check Reply #1 - Feb 7^th, 2006, 10:50am Without knowing the specifics of how the Assura rules have been written, it's hard to give a response here. You might want to ask AMS, since it's their design kit? Regards, Andrew.
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Alef

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Posts: 4

Re: question on Assura LVS check
Reply #2 - Apr 12^th, 2006, 11:02pm

I think, the problem is in extract.rul file for assura. There is no connection for met1 and poly pins in geomConnect part. Usually pins, labels and text pins are described by using label ( ) function in this part. If you can work with your design rules, the usage of label function (and the others) is described in assura LVS development guide.

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basf New Member Offline Posts: 3	Re: question on Assura LVS check Reply #3 - Oct 3^rd, 2006, 6:06am Hello I have the same problem with Assura LVS. I try almost everything but there is no results. There are no pin extraction from layout.
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bernd

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Posts: 229
Munich/Germany

Re: question on Assura LVS check
Reply #4 - Oct 4^th, 2006, 3:04am

I assume that Assura does not realize the DFII specific pin shape.

Have you guys checked the Assura command rule file for the specific connmands?
e.g.
layerDefs( "df2" ... m1 = layer( "METAL1" type( "drawing" ) ) ... ;; create labels form DFII pins m1_text = pinText( "METAL1" ) ... ) ... geomConnect( ... label( m1_text m1 ) ... )

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Just another lonesome cad guy

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jak New Member Offline Posts: 4	Re: question on Assura LVS check Reply #5 - Oct 13^th, 2006, 1:00am have you tried creating pins from labels? it seemed to work for me with Assura.The pins from layout were identified.. Don't know if there is any pitfalls associated with that aproach.
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didac

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Posts: 247
manresa,spain

Re: question on Assura LVS check
Reply #6 - Dec 17^th, 2006, 2:54am

Hi to all,

I've been working several months with Assura and a UMC 180n design kit and as far as I know the only way you can pass the LVS is using labels with the pin name. You must put the label in the same shape(i.e. if the path Input it's drawn in ME4 you must create a label in ME4). We've done this for several layouts and we have success in doing the LVS and the parasitic extraction for post-layout simulations.

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