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OrCAD Capture DRC does not catch dangling off-page

Allan M

Hi Cadence Community,

I have a design with two pages:

Page 1 has a component with 3 passive pins, 2 of which are connected to a named net and the remaining pin is unconnected.  There are 3 named off-page connectors on page 1.  Two of these off-page connectors are connected to the two nets that terminate at the aforementioned connector on page 1 but the remaining off-page reference a net that is not connected to anything on that page.

On page 2, there are 3 off-page connections that match those on page 1.  The net not connected on page 1 has two connections on page 2.

Why does the DRC not catch the dangling off-page on page 1? (Yes, I do I have the "Check off-page connector connections" option checked.)  Obviously, the presence of the off-page connector on Page 1 implies that I intend to connect that net to something on page 1.  The DRC does not notice anything wrong.

This is a simplified example of a more complex multi-page schematic I have where I must resolve many of these dangling off-page connectors that must be terminated to pins present on page 1.  Because the DRC is not catching them, I must manage these manually by visual inspection and I might miss one.

Is there a way to get the DRC to catch these?  Is this a bug or a deficiency in the DRC algorithm?

Thanks,

Allan

  • oldmouldy

    Which exact version are you using?

    Works as expected for me with 16.6.s050.

    Checking Off-Page Connections

    WARNING(ORCAP-1594): The off-page connector does not have any wire connected. C

  • Allan M

    Same version.  What is the DRC error you are getting?  Perhaps the following description would be more helpful to reproduce the problem:

    Wire List

    Offpage DRC Bug                               Revised: Friday, June 26, 2015
    C:\local\work\misc\testbug\offpagebug.dsn     Revision: 0

    <<< Component List >>>
    CON3                          J101      CON3
    CON3                          J201      CON3
    1k                            R201      1k

    <<< Wire List >>>

      NODE  REFERENCE    PIN #   PIN NAME           PIN TYPE       PART VALUE

    [00001] SIG1
            J101            1       1               Passive        CON3
            J201            1       1               Passive        CON3

    [00002] SIG2
            J101            2       2               Passive        CON3
            J201            2       2               Passive        CON3
            R201            1       1               Passive        1k

    [00003] SIG3
            J201            3       3               Passive        CON3
            R201            2       2               Passive        1k

    J101 is on page 1.  J201 and R201 are on page 2.  Sig1, Sig2 and Sig3 have off-page connectors on both pages 1 and 2.

    The following is my DRC report:

    Date and Time : 06/26/15 17:19:06

    --------------------------------------------------
    Checking Schematic: SCHEMATIC1
    --------------------------------------------------
    Checking Electrical Rules

    Checking For Single Node Nets

    Checking For Unconnected Bus Nets

    Checking Off-Page Connections

    Reporting Ports

    Reporting Off-Page Connections
        sig1
        sig2
        sig3

    Reporting Globals

    INFO(ORCAP-2207): Check Bus width mismatch

    Checking Physical Rules


    Checking Pins and Pin Connections

    --------------------------------------------------
    Checking Schematic: SCHEMATIC1
    --------------------------------------------------

    INFO(ORCAP-2242): Checking Incorrect Pin Group Assignment

    Report for Invalid References

    Report for Duplicate References

    --------------------------------------------------
    Checking Entire Design: offpagebug
    --------------------------------------------------

    Checking Power Pin Visibility  

    Checking Normal Convert View Sync  
    INFO(ORCAP-36105): Checking Missing Pin Numbers  

    Checking Device with Zero pins  

    Checking Name Property for Hierarchical Instances  

    INFO(ORCAP-2211): Check High Speed Properties Syntax

    INFO(ORCAP-2212): Check Power Ground Mismatch

    Reporting Unused Refdes in multiple part packages
    Part                           Quantity                           Reference
    -----------------------------------------------------------------------------------------

  • oldmouldy
    In my case, the Off Page has no wire, hence it is detected as not having a wire, see the message. In your case, you have a dangling wire, Configure the Custom DRC for Hanging Wires and run that, then you will get a DRC reported.
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