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PCB autorouter(spectraa) not converging

bennyn1

 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 it did not converge(couldnt route the board fully).Then i tried to route it in Spectra still it didnt converge.Increasing the number of layers didnt help.What is wrong?? Is it because of BGA package? Or is it because I did not use padstacks.

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  • redwire

    bennyn1 said:
    Also it seems that one has to manually fanout a BGA package first with proper vias.

     

    Definitely do NOT have to add manually.  You have a clearance issue if Specctra is not fanning out the BGA properly.  Like I said in my previous post, you need to test this by routing by hand to see if you are getting errors.  If your clearances are correct then you would not be asking.

    DO files are on Cadence's customer support website sourcelink.cadence.com

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  • redwire

    bennyn1 said:
    Also it seems that one has to manually fanout a BGA package first with proper vias.

     

    Definitely do NOT have to add manually.  You have a clearance issue if Specctra is not fanning out the BGA properly.  Like I said in my previous post, you need to test this by routing by hand to see if you are getting errors.  If your clearances are correct then you would not be asking.

    DO files are on Cadence's customer support website sourcelink.cadence.com

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