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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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  • avant
    0 avant 6 months ago

    I generally use a zero-ohm resistor to tie two nets together.

    You can create a footprint with two pins and a drawn line between the pins.

    Put the drawn line onto a non-etch layer and remember to add this layer to your artwork layer.

    DRC won't flag this as an error, but I'd add a note that this short is intentional on the fab drawing. The fab shop will flag it during a net check.

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  • avant
    0 avant 6 months ago

    I generally use a zero-ohm resistor to tie two nets together.

    You can create a footprint with two pins and a drawn line between the pins.

    Put the drawn line onto a non-etch layer and remember to add this layer to your artwork layer.

    DRC won't flag this as an error, but I'd add a note that this short is intentional on the fab drawing. The fab shop will flag it during a net check.

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