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  3. DRC on duplicate nets

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DRC on duplicate nets

WC202409216216
WC202409216216 over 1 year ago

Hi, 

Do we have any DRC checking rules that can flag same net name used in different places except it has off-page connector? see highlighted circles in picture below, would like the DRC tool to catch this.

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  • Jeet
    0 Jeet over 1 year ago

    Off-page connectors carry nets (names) between schematic pages within the same schematic folder.

    You can use the signal navigation feature in Capture to navigate the connected signals on a design. This feature allows you to select a signal that you want to trace. Capture then browses for all the connected signals on the design. Finally, you can select and highlight the signals from the browse list.

    To find and navigate the signals on a design
    1. Select the off-page connector, hierarchical port, net or bus to find its connecting signals.
    2. Right-click and choose the Signals option from the pop-up menu.
    3. A browse list appears with all the signals that are connected to the currently selected signal.

    4.Double-click on a signal in this list to navigate to the connected signal.

    Also, I want like to understand if there is some particular requirement due to which you want to use this DRC?

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  • Jeet
    0 Jeet over 1 year ago

    Off-page connectors carry nets (names) between schematic pages within the same schematic folder.

    You can use the signal navigation feature in Capture to navigate the connected signals on a design. This feature allows you to select a signal that you want to trace. Capture then browses for all the connected signals on the design. Finally, you can select and highlight the signals from the browse list.

    To find and navigate the signals on a design
    1. Select the off-page connector, hierarchical port, net or bus to find its connecting signals.
    2. Right-click and choose the Signals option from the pop-up menu.
    3. A browse list appears with all the signals that are connected to the currently selected signal.

    4.Double-click on a signal in this list to navigate to the connected signal.

    Also, I want like to understand if there is some particular requirement due to which you want to use this DRC?

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  • WC202409216216
    0 WC202409216216 over 1 year ago in reply to Jeet

    I understand the offpage connector but it doesn't solve issue here.

    For example, if I accidentally named two nets the same name. I want to DRC check to be able to find out and warning me. Otherwise two nets will be connected together. 

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  • Jeet
    0 Jeet over 1 year ago in reply to WC202409216216

    When signals with the same aliases (names) are on the same schematic page, OrCAD Capture automatically connects them. In the following illustration, C1 and R1 are connected to Net1.

    Are you giving same net names on same schematic page or on different schematic pages?

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  • WC202409216216
    0 WC202409216216 over 1 year ago in reply to Jeet

    I am naming the same net name on the same schematic. I want Cadence to capture the same nets during DRC check. To your example, I want Candence DRC check to tell me there is a NET1 that doesn't have off page connector but connected in two different places. I always explicitly use the off-page connector if I want the net name to be the same to avoid error.

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  • Jeet
    0 Jeet over 1 year ago in reply to WC202409216216

    Can you try using the net names in the Find Window in OrCAD Capture?

    I have searched NET1 in Find window as shown below it is highlighting the nets present on the schematic page.

    There is no DRC in OrCAD from GUI to check the nets which have same name connected in some instances and are not connected from off-page. Are you interested in TCL Scripting to generate this DRC?

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  • WC202409216216
    0 WC202409216216 over 1 year ago in reply to Jeet

    Yes, TCL scripts work for me, can I have one? 

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