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Physical constraint error

Neha Anu

Hi everyone,

I imported a .brd file from the Allegro PCB Editor to specctra for autorouting.I set the electrical and physical and spacing rules for the all the nets in the Allegro PCB Editor Constraint Manager but when i exported that to the Specctra Autooruter the spacing rules are not visible.Moreover the nets are routing without these spacing rules(Wire to wire spacing,wire to via spacing etc).But these are following the electrical and physical rules.Can anyone please give a solution to route the nets with the spacing constraints also?Is there any command to autoroute the nets including the spacing rules?

Thanks in advance

Neha.

 

  • BillZ

    Hi,

    If you export the brd to Specctra and Launch the router (Specctra) yo have to load the rules.do file. The spacings will then be applied.

    If you launch the router from inside PCb Editor the rules are loaded.

    Route>Route Editor

    Regards,

    BillZ

    EMA Design Automation

  • Neha Anu

    Hi BillZ,

    I usually launch the router from PCB Editor.All the rules except the spacing rules for some nets are not loading.Some of the nets have the spacing rules also for example the wire to wire clearance etc.How can i overcome this situation?

    Thanx

    Neha.

     

     

  • Ejlersen

    Hi Neha

    The best thing I can come up with is that you have DRC modes turned off for the constraints that are not getting passed to Specctra.

    Go to Analyze->Analysis modes in Constraint Manager (Setup->Constraints->Modes in PCB Editor)

    Select Spacing Modes and make sure that the constraints are checked in the list. Do the same for same-net-spacing if you have such constraints setup.

    NB: All new constraints introduced in PCB Editor by default have DRC mode set to OFF for backward compability reasons. 

    Best regards

    Ole

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