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How to traverse the hierarchy in a schematic

aryajur

Hi,

         I am totally new to SKILL. I am trying to write a skill routine to traverse the hierarchy of a schematic. Basically I want to pick each port at the top schematic and go down the hierarchy tracing each net down the hierarchy and listing out to which pin it connects to for certain type of components. 

        What functions can help me in:

1. Listing out the ports on the schematic

2. Listing out the subcircuits in the schematics that I can open and go inside

3. Trace a net to find the components connected to it on a particular schematic.

 

Thanks.

Parents
  • Quek

    Hi aryajur

    I think perhaps you can use the following method to trace schematic net connectivity:
    a. Find all instances and terminals connected to the net using the script below
    b. Open each of the instances and repeat step "a"

    "cv~>instances" gives the list of instance IDs. "cv~>instances~>master" gives the cellview ID of the master cell from which the instances where created. E.g.

    cv=geGetWindowCellView()

    cv~>instances~>name
    ("M2" "M1" "M0" "M7" "M6"
        "M5" "M4" "M3" "PIN4" "PIN1"
        "PIN0" "PIN3" "PIN2" "R2" "R3"
        "R0" "PIN5" "C0"
    )

    The above gives the instance names. But if I were to do this:

    cv~>instances~>master~>name

    I will get "nil". It is expected that both "cv~>instances~>cellName" and "cv~>instances~>master~>cellName" are the same since it is the same cell that is being used. Cell "abc" is used to create instance "I0" in a schematic. The name of the cell master is still "abc". : )


    Best regards
    Quek


    procedure( CCSgetNetObj(myNet)
       prog( (cv allInsts instList term allTerminals)
          cv=geGetWindowCellView()
          allInsts=cv~>instances
          allTerminals=cv~>terminals
          instList=list()
          foreach( inst allInsts
             when( member(myNet inst~>instTerms~>net~>name)
                instList=cons(inst instList)
             ) ;when
          ) ;foreach
          term=car(setof(x allTerminals x~>net~>name==myNet))
          if( term then
              printf("Net %s is connected to instances : %L and terminal : %s\n"
            myNet instList~>name term~>name)
          else
              printf("Net %s is connected to instances : %L\n" myNet instList~>name) 
          ) ;if
          return(list(instList term))
       ) ;prog
    ) ;procedure

    getnetobj.il
Reply
  • Quek

    Hi aryajur

    I think perhaps you can use the following method to trace schematic net connectivity:
    a. Find all instances and terminals connected to the net using the script below
    b. Open each of the instances and repeat step "a"

    "cv~>instances" gives the list of instance IDs. "cv~>instances~>master" gives the cellview ID of the master cell from which the instances where created. E.g.

    cv=geGetWindowCellView()

    cv~>instances~>name
    ("M2" "M1" "M0" "M7" "M6"
        "M5" "M4" "M3" "PIN4" "PIN1"
        "PIN0" "PIN3" "PIN2" "R2" "R3"
        "R0" "PIN5" "C0"
    )

    The above gives the instance names. But if I were to do this:

    cv~>instances~>master~>name

    I will get "nil". It is expected that both "cv~>instances~>cellName" and "cv~>instances~>master~>cellName" are the same since it is the same cell that is being used. Cell "abc" is used to create instance "I0" in a schematic. The name of the cell master is still "abc". : )


    Best regards
    Quek


    procedure( CCSgetNetObj(myNet)
       prog( (cv allInsts instList term allTerminals)
          cv=geGetWindowCellView()
          allInsts=cv~>instances
          allTerminals=cv~>terminals
          instList=list()
          foreach( inst allInsts
             when( member(myNet inst~>instTerms~>net~>name)
                instList=cons(inst instList)
             ) ;when
          ) ;foreach
          term=car(setof(x allTerminals x~>net~>name==myNet))
          if( term then
              printf("Net %s is connected to instances : %L and terminal : %s\n"
            myNet instList~>name term~>name)
          else
              printf("Net %s is connected to instances : %L\n" myNet instList~>name) 
          ) ;if
          return(list(instList term))
       ) ;prog
    ) ;procedure

    getnetobj.il
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