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How do you route multiple nets (like buses) efficiently in Allegro PCB Editor?

Electro Node

Hi everyone,

I’m working on a DDR design with multiple data buses, and routing nets individually feels quite time-consuming.
Is there a way in Allegro to route multiple nets together while maintaining consistent spacing?

I need to route multiple nets in one go. Would love to hear your approach!

Thanks!

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  • techiecs
    0

    If you want to route multiple nets together in one go while maintaining a consistent spacing, then you can use the Interactive group routing in layout editor, which is routing of more than one net concurrently. You can use this feature when routing a bus with traces that follow the same path and have common physical and electrical rules.

    To specify the nets for group routing, select the elements (such as clines, pins, vias, and ratsnests) from which to route either by using the Temp Group option from the add connect pop-up menu or selecting the elements with a window. Routing proceeds from the selected elements.

    When group routing, you can change the spacing mode between traces to either 'Current mode', which is the default mode, traces continue at the same spacing with which they started. Or you may choose 'Minimum DRC mode', where adjacent traces are separated by the line-to-line space specified in the applicable spacing constraint set. Traces from the same differential pair traces are spaced by the applicable differential pair gap. Or you may choose 'User-defined' and then enter a spacing value.

    Attaching a link which talks about Interactive Group Routing and how it works:
    https://ask.cadence.com/ASK/techpub-viewer?xmlName=algroroute.xml&title=Allegro+X+User+Guide%3A+Routing+the+Design+--+Interactive+Group+Routing+-+Interactive+Group+Routing&c_version=25.1&path=algroroute%2Falgroroute25.1%2FInteractive_Group_Routing.html&pageName=techpub-viewer

    Request you to please explore this if it may help with your requirement.

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