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How to Find the drawn net("MET1" "drawing") in the layout.

ShrikantTI
Requirement is that I need to find if there are any existing nets or paths in the layout so that I can connect the rest except those paths. Another issue is that when i draw the path the skill command does not recognize it as net until there net expression is given unlike in schematic it takes a predefined value. I tried to explore using shapes but did not have much definitive solution. Please can you help? Also how to find which all terminals is the path or net connected? I need to get the name of the terminals from the subblock as the terminals of the subblocks are not visible. Thanks, Shrikant
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  • Andrew Beckett

    The database can be used to represent logical connectivity either separate from or together with physical geometries. That way you can represent in the database how terminals of devices should be connected despite the fact that the physical routing has not been implemented yet. As you do the physical routing you can associate the geometries with the nets - and then the shapes are marked as being associated with the net. You can show (in the layout editor) flight lines for nets to show the logical connectivity if you wish (this is on the Display Options form) to show lines between pins on instances and also top level pins - assuming that the device has instTerm objects created too to associate the instance terminals with specific nets. Layout XL does this when it creates devices - the connectivity is set up in the database.

    Nets (like most database objects) can be deleted with dbDeleteObject().

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    The database can be used to represent logical connectivity either separate from or together with physical geometries. That way you can represent in the database how terminals of devices should be connected despite the fact that the physical routing has not been implemented yet. As you do the physical routing you can associate the geometries with the nets - and then the shapes are marked as being associated with the net. You can show (in the layout editor) flight lines for nets to show the logical connectivity if you wish (this is on the Display Options form) to show lines between pins on instances and also top level pins - assuming that the device has instTerm objects created too to associate the instance terminals with specific nets. Layout XL does this when it creates devices - the connectivity is set up in the database.

    Nets (like most database objects) can be deleted with dbDeleteObject().

    Regards,

    Andrew.

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