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How to set / overwrite instance inherited netset property in layout view?

sl3j

 How to set / overwrite instance inherited netset property in layout view?

I am trying something like this

dbCreateProp(myInst "vdd"  "netSet"    vdd1)

It does not seem to work, the connectivity in Layout XL does not show any change!

The signal vdd1 already alread exists in the layout.

 Any way to change signal mapping of instance terminals?

 

Parents

  • In general inherited connections in layout are a slightly different concept, because you always have physical connectivity - you want to connect up based on wires connected to pins. I don't believe adding a netSet on an instance will override the connectivity because presumably any nets within the instance would have a pin with a netExpr on (that you're attempting to override) but the instance would have instTerms which are connected to a specific net at this level. An instTerm connected to a net will always override whatever the netExpr said.

    Not sure if that was very clear - it's hard to describe without an example. So maybe talking this through with customer support would make sense?

    Regards,

    Andrew.

Reply

  • In general inherited connections in layout are a slightly different concept, because you always have physical connectivity - you want to connect up based on wires connected to pins. I don't believe adding a netSet on an instance will override the connectivity because presumably any nets within the instance would have a pin with a netExpr on (that you're attempting to override) but the instance would have instTerms which are connected to a specific net at this level. An instTerm connected to a net will always override whatever the netExpr said.

    Not sure if that was very clear - it's hard to describe without an example. So maybe talking this through with customer support would make sense?

    Regards,

    Andrew.

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