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Constraints,DRC error

  • Allegro PCB Designer : Interlayer Spacing ?

    Hi, I'm currently working with Cadence 16.5 and I would like to add an interlayer spacing constraint for two adjacent layers, in order to prevent interlayer crosstalk between differential pairs. I spent some hours looking for a solution, and I found this post : http://www.cadence.com/Community/forums...
    Posted to PCB Design (Forum) by mxlecanu on Thu, Jul 26 2012
  • 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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