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problems when using techGetSpacingRule

Adhil

Hi

1. Im trying to execute the following command:

techGetSpacingRule( tfId "minSpacing" "PC" "CA")

but the it returns nil. is this because the techfile.tf is improperly written, or are there any other reasons

 2. in totally unrelated issue, what is the difference between a master and a supermaster?

 

Adhil.

Parents
  • skillUser

    Hi Adhil,

    Are you sure that the rule is encoded in the tech file?  You could inspect the minSpacing rules to see what is present, for example:

     setof(minsp techGetSpacingRules(tfId) car(minsp)=="minSpacing")
=> (("minSpacing" 1.0 "Nwell") 
     ("minSpacing" 0.3 "Oxide") 
     ("minSpacing" 0.3 "Poly") 
     ("minSpacing" 0.4 "Nimp") 
     ("minSpacing" 0.4 "Pimp")
     ("minSpacing" 0.2 "Cont") 
     ... 
     ("minSpacing" 0.0 "Metal3" "Via2") 
     ("minSpacing" 0.2 "Oxide" "Poly") 
     ("minSpacing" 0.2 "Poly" "Cont")
   )

    So my example shows three two-layer minSpacing rules.

     

    For the other question, for PCells the "master" of the PCell is termed the superMaster, if looking up from the instance you will see the master first (that is to say the cell that has this particular set of parameter values) and above this is the superMaster (the parent that is stored on disk).  The superMaster is the "default" PCell, but even if you were to place an instance with default parameters a (sub)-master would be created.  If you are looking 'down' from the PCell you have the PCell master, a sub-master(s) and then the instance(s).  Although this may be confusing, I hope that it answers your question and maybe sheds some light on the terminology used.

    Regards,

    Lawrence.

Reply
  • skillUser

    Hi Adhil,

    Are you sure that the rule is encoded in the tech file?  You could inspect the minSpacing rules to see what is present, for example:

     setof(minsp techGetSpacingRules(tfId) car(minsp)=="minSpacing")
=> (("minSpacing" 1.0 "Nwell") 
     ("minSpacing" 0.3 "Oxide") 
     ("minSpacing" 0.3 "Poly") 
     ("minSpacing" 0.4 "Nimp") 
     ("minSpacing" 0.4 "Pimp")
     ("minSpacing" 0.2 "Cont") 
     ... 
     ("minSpacing" 0.0 "Metal3" "Via2") 
     ("minSpacing" 0.2 "Oxide" "Poly") 
     ("minSpacing" 0.2 "Poly" "Cont")
   )

    So my example shows three two-layer minSpacing rules.

     

    For the other question, for PCells the "master" of the PCell is termed the superMaster, if looking up from the instance you will see the master first (that is to say the cell that has this particular set of parameter values) and above this is the superMaster (the parent that is stored on disk).  The superMaster is the "default" PCell, but even if you were to place an instance with default parameters a (sub)-master would be created.  If you are looking 'down' from the PCell you have the PCell master, a sub-master(s) and then the instance(s).  Although this may be confusing, I hope that it answers your question and maybe sheds some light on the terminology used.

    Regards,

    Lawrence.

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