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Specify the metal Layers in SOC encounter

amythpai

Hello,

 I am a newbie at placement and routing. I want the routing to be done using only metal 3,4 and 5 ( basically other than metal 1 and 2).

Can anyone please advise me as to where I have to mention this and the command used to get routing metal layers set? 

 

Any help in this regard is appreciated!

Thank you 

Parents
  • Thank you for your Quick reply. Actually I have tried this but it resulted in a lot of DRC violations. My probelm is that I had initially routed using default option for routing layers. I ran the verify geometry command and it didnot result in any violations. But when I exported the gds file in to virtuoso and ran the DRC check it resulted in 15k errors. I found that many of the errors were not detected by the SOC encounters Verify Gemetry option were now getting detected by the Virtuoso DRC which looks strange. Then I tried to route using metal layers 3 to 5 only but it resulted in DRC violations at the SOC encounter stage itself. Will changing the cell utilisation or the size of the floorplan make a difference. If not can you suggest any other method? Thank you for your help!
Reply
  • Thank you for your Quick reply. Actually I have tried this but it resulted in a lot of DRC violations. My probelm is that I had initially routed using default option for routing layers. I ran the verify geometry command and it didnot result in any violations. But when I exported the gds file in to virtuoso and ran the DRC check it resulted in 15k errors. I found that many of the errors were not detected by the SOC encounters Verify Gemetry option were now getting detected by the Virtuoso DRC which looks strange. Then I tried to route using metal layers 3 to 5 only but it resulted in DRC violations at the SOC encounter stage itself. Will changing the cell utilisation or the size of the floorplan make a difference. If not can you suggest any other method? Thank you for your help!
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