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I have the following questions regarding orcad.
We draw the circuit diagrams and make the connections in the schematic. We create a netlist. And then we import it to the layout.
1. After importing netlist to the layout the designer should not be able to make any modifications (adding connection or component,deleting connection or component) in the layout. If yes then how?
2. But in some cases the designer may want to modify the connections and the components. In such case is it possible for the designer to modify the connections and components in the schematic and update it in the existing layout? if yes then how?
If answer for the question1 is No then,
3. Is it possible for the designer to make the modifications in the layout itslef and apply these updates to the existing schematic? if yes then how?
I will attempt to answer what you ask,
1 When you Package a board from a schematic Netlist in Allegro it is possible for the designer to add extra footprints to the board if they want. It is also possible to change the Net Logic or nets. This could be done by placing a extra symbol on the board or editing the nets with net logic. They could also leave pins unconnected or un routed or short out ground planes with vias. It would certainly be possible to not have a board that matches the schematic but this is true for a bunch of PCB tools not just what cadence offers.
2 It is possible to Forward Annotate changes from the schematic "Nets, Footprints" etc to the board.
3 Not directly, but it may be possible to use NetLogic to rename a net in the PCB editor then if the designer had access to the schematic he / she could back annotate the changes.