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  3. Net-tie without manually specifying net names

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Net-tie without manually specifying net names

pertinax
pertinax 6 months ago

I want to create a net-tie in the schematic and layout. I.e., a schematic symbol with two pins and a corresponding footprint with two shorted pins.  See the screenshots below.

I have read this document https://www.parallel-systems.co.uk/wp-content/uploads/2020/02/Netshort_Definition.pdf and also this RAK https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000007MqM1UAK&pageName=ArticleContent.

Without adding any properties, the shorted footprint causes DRC errors in the layout. In my case I get "SMD Pin to Pin Spacing" DRC. It is possible to add a NET_SHORT property, either to the schematic component as described in the first document or in the layout using the "net short" command. However, this requires either specifying the exact net names in the schematic property or manually performing the net short in the layout.

In the second document above, I read about the PIN_SHORT property. Apparently it can be added to the schematic symbol, giving the names of the pins, and the "packager" will automatically create the NET_SHORT property during packaging. I added the property PIN_SHORT=1:2 to the schematic symbol, with pin names for the pins set to "1" and "2". This did not work.

I read that the packager needs the option "PROCESS_PIN_SHORT_PROP 'ON'" for this to work (page 12 of the RAK). However, I don't know if this is applicable to Orcad X Professional (PCB Editor 23.1), or where to add this said option. According to the document, it needs to be added to the "project cpm file" or "site cpm file".

Thanks for any help!

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  • AC202502108327
    0 AC202502108327 6 months ago

    To create a net-tie without manually specifying net names in OrCAD PCB Editor, ensure the following:

    1. Add the property PIN_SHORT=1:2 to the schematic symbol with correct pin names.
    2. Verify that the packager option PROCESS_PIN_SHORT_PROP 'ON' is enabled.
    3. Locate the CPM file under your project directory or site settings and edit it to include this option.
    4. If issues persist, double-check pin assignments and packaging rules in the schematic.
    5. Consult Cadence support if the option isn't recognized in version 23.1.
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  • AC202502108327
    0 AC202502108327 6 months ago

    To create a net-tie without manually specifying net names in OrCAD PCB Editor, ensure the following:

    1. Add the property PIN_SHORT=1:2 to the schematic symbol with correct pin names.
    2. Verify that the packager option PROCESS_PIN_SHORT_PROP 'ON' is enabled.
    3. Locate the CPM file under your project directory or site settings and edit it to include this option.
    4. If issues persist, double-check pin assignments and packaging rules in the schematic.
    5. Consult Cadence support if the option isn't recognized in version 23.1.
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  • pertinax
    0 pertinax 6 months ago in reply to AC202502108327

    Hello, I cannot make this work. I have found one CPM-file in C:\Cadence\SPB_23.1\share\cdssetup\projmgr and it has this option enabled.

    Is the packager and cpm-files used with PCB Editor? When googling and reading configuration options it seems the CPM-files are used by another tool called projmgr or Project Manager. Tried to run this tool and successfully created a project, but when trying to launch design entry it tried to start "Concept HDL" and failed with a license error. Perhaps the PIN_SHORT method is not supported by OrCAD Capture?

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