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16.3,Constraint Manager

  • Allegro Constraint Manager (CM) Vs Specctraquest reports Delay

    We are wondering why we are seeing some differences in Allegro 16.3 CM reports and post layout extracted specctraquest reports for diff pairs signals (specifically electrical length and physical length) for prop delay in relative prop delay for the matched length group. We have set up all board parameters...
    Posted to PCB Design (Forum) by qwerty on Thu, Mar 31 2011
  • Differential Pair - Z Axis Spacing

    I am working with several hundered diff pairs and need to maintain a pair to pair minimum spacing on both the same and adjacent layers. Is there a way to set this up in constraint manager? I am running 16.3 Also, is there a new "Best Practices" paper for working with Differerential pairs in...
    Posted to PCB Design (Forum) by Liana on Tue, Feb 15 2011
  • Different Force and Sense Line Widths using Pin Pair Physical Constraints

    Hi all, I have been trying to find a method to specify different line widths for the same net. Specifically, I need a force line and sense line to be routed separately to single DuT pin. These lines should be different line widths since the force line carries high current and the sense line doesn't...
    Posted to PCB Design (Forum) by jackg23 on Tue, Feb 1 2011
  • PCB autorouter(spectraa) not converging

    Hi, I am making my first pcb with a xilinx fpga device(256 pin BGA package).I am simply connecting the all I/O's to 4 standard 40 pin connectors.Are padstacks necessary for PCB routing??.I have drawn the schematic in Capture imported it to Layout_Plus and autorouted it. But after 3 hours of autorouting...
    Posted to PCB Design (Forum) by bennyn1 on Thu, Sep 2 2010
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