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Converting a Special Route to a Regular Wire

jgentry

I've finally delved into the 'dbCreateRestrictedViaCell' and 'dbCreateVia' commands.  Pretty slick!  However, I'm having trouble with "Special Route" versus "Regular Wire".  When I create vias on non-power/ground nets, I don't want my vias to end up in the "SPECIAL NETS" section of the DEF.  One way to do this is:
 
  dbCreateVia $netPtr $viaCellPtr $cX $cY
...then...
  convertSNetToNet -nets $net
  setNet -net $net -type regular
  editSelect -nets $net
  editChangeStatus -to FIXED

  However, this is HORRIBLY slow to do each time I create a new via.  I've removed this from the via-generation code and instead moved it into its own "convertSNetToNet" proc that can be run after via-generation is finished.  Anyone know of a better way? 

  • You could try editAddVia (along with setViaEdit to set parameters). I'm not sure if vias created this way would be marked as SPECIAL or REGULAR when adding a via to a REGULAR net. I've only used it for SPECIALNETs so far. Also, I'm not sure if these commands are slower than the dbCreate commands you are currently using. Worth a try though! Let us know what you find out if you try these.

     - Kari

  •  time {
      editAddVia $x $y
    }
    9201 microseconds per iteration

    time {
      agCreateVia regular_wire $loLayer $loRect $hiLayer $hiRect
    }
    2787 microseconds per iteration

    time {
      agCreateVia regular_wire $loLayer $loRect $hiLayer $hiRect
      agConvertSNetsToNets rptr_in
    }
    5115 microseconds per iteration

     

    Looks like the fastest method is to still create all the vias I need with 'agCreateVia' (my own wrapper on dbCreateVia and dbCreateRestrictedViaCell) and then call agConvertSNetsToNets (wrapper around the first-post's code).  

  • I want to convert my special net to regular wire in my design, If i m trying mention commands it remains special nets only:

    convertSNetToNet -nets $net
      setNet -net $net -type regular
      editSelect -nets $net
      editChangeStatus -to FIXED

    Can you help me in this?

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