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Is sign off LVS check neccessary for Encounter based PnR

Greatrebel

 Hi All,

 I would like to ask whether sign off LVS by tools like Assura and Calibre is really neccessary for Encounter based PnR. Because the layout and schematic are all from the layout generated by Encounter. I think ideally they should be same, not like the custom layout design where the schematic and layout are generated seperately by different engineers. And also Encounter does have some basic connectivity check, sign off LVS seems like not that important. Am I right? 

 

Thank you very much

 

 

Parents

  •  Hi,

     I saw your Assura post, but unfortunately I don't have any experience with Assura.

    Can the foundry give you more information on running LVS with phantom cells? SOMEONE needs to do a signoff LVS. If the foundry won't give you the layouts, then they should be running the LVS. You can have shorts through the substrate, etc.

    Occasionally we will not be able to get GDS for a macro or something, and we can "black box" that macro. But I have not heard of the case where you can't get the layouts of std cells. I suppose you could black-box everything and just verify the routing. Could you contact your Cadence support AE? Or maybe file a Service Request asking how to run Assura LVS when you don't have cell layouts?

    Sorry I'm not more help.

     - Kari

Reply

  •  Hi,

     I saw your Assura post, but unfortunately I don't have any experience with Assura.

    Can the foundry give you more information on running LVS with phantom cells? SOMEONE needs to do a signoff LVS. If the foundry won't give you the layouts, then they should be running the LVS. You can have shorts through the substrate, etc.

    Occasionally we will not be able to get GDS for a macro or something, and we can "black box" that macro. But I have not heard of the case where you can't get the layouts of std cells. I suppose you could black-box everything and just verify the routing. Could you contact your Cadence support AE? Or maybe file a Service Request asking how to run Assura LVS when you don't have cell layouts?

    Sorry I'm not more help.

     - Kari

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