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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 Kari,

     Thank you very much for your reply. We can not get the spice and gds for std cell, IO cell and so on from the foundry. So I can not have the full layout view when imported into Virtuoso. Is that still meanful to do a sign off LVS without the full layout. And you are right, the foundry does not do sign off LVS for us. They said that " you are able to perform LVS with the phantom views of the standard cells"

     But when I run LVS by Assura, it failed, due to Errors exist in the rules file './extract.rul'. The log file shows there is an unbound value called SCraw. It is the first time I use Assura LVS. I posted this question in another post called "Assura LVS failed by an error in the rule file", but have not gotten any response yet.

     

     

Reply

  •  Hi Kari,

     Thank you very much for your reply. We can not get the spice and gds for std cell, IO cell and so on from the foundry. So I can not have the full layout view when imported into Virtuoso. Is that still meanful to do a sign off LVS without the full layout. And you are right, the foundry does not do sign off LVS for us. They said that " you are able to perform LVS with the phantom views of the standard cells"

     But when I run LVS by Assura, it failed, due to Errors exist in the rules file './extract.rul'. The log file shows there is an unbound value called SCraw. It is the first time I use Assura LVS. I posted this question in another post called "Assura LVS failed by an error in the rule file", but have not gotten any response yet.

     

     

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