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constraining no. of metal layers in Cadence SoC encounter

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Hi all! Please let me know if there is any form in the tool Cadence SoC encounter where we can declare no. of routing layers for our design with limited no. of metals say 5. But my tool & Technology supports 8 Layer Metal. One solution what I found is during design Import we can call technolgy file(.lef) of say 5 Layer metal. Is there any other place in the entire flow where I can constrain say to 5LM in the tool? Thanks in Adv!
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  • Hi ,

                        1. In the place stage you will be using trialroute for nets so there you can use
                                                              setTrialRouteMode  -maxRouteLayer  <value>
                                                              setPlaceMode -maxRouteLayer <value>
                        2.In CTS(If you actual routing of CTSnets later)
                                            setTrialRouteMode -maxRouteLayer <value>
                           In CTSspecfile dont forget to include
                                             TopPreferredLayer      <value>
                                             BottomPreferredLayer   <value>
                          3.set_attribute -net <netname> -top_preferred_routing_layer <value> --bottom_preferred_routing_layer <value> 

    Hope this helps you !

    Thanks n Regards
    NAADHAN      
                                        

Reply

  • Hi ,

                        1. In the place stage you will be using trialroute for nets so there you can use
                                                              setTrialRouteMode  -maxRouteLayer  <value>
                                                              setPlaceMode -maxRouteLayer <value>
                        2.In CTS(If you actual routing of CTSnets later)
                                            setTrialRouteMode -maxRouteLayer <value>
                           In CTSspecfile dont forget to include
                                             TopPreferredLayer      <value>
                                             BottomPreferredLayer   <value>
                          3.set_attribute -net <netname> -top_preferred_routing_layer <value> --bottom_preferred_routing_layer <value> 

    Hope this helps you !

    Thanks n Regards
    NAADHAN      
                                        

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