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 PCB design and Layout 

Last post Thu, Nov 22 2012 9:35 PM by ScottCad. 1 replies.
Started by Wonderman 20 Nov 2012 01:00 AM. Topic has 1 replies and 728 views
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  • Tue, Nov 20 2012 1:00 AM

    • Wonderman
    • Not Ranked
    • Joined on Mon, Nov 19 2012
    • Posts 7
    • Points 140
    PCB design and Layout Reply

    Hi everybody,

    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?

    Filed under: ,
    • Post Points: 20
  • Thu, Nov 22 2012 9:35 PM

    • ScottCad
    • Top 50 Contributor
    • Joined on Sat, May 26 2012
    • Roswell, GA
    • Posts 193
    • Points 3,185
    Re: PCB design and Layout Reply

    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.

    Scott  

    • Post Points: 5
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Started by Wonderman at 20 Nov 2012 01:00 AM. Topic has 1 replies.