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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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  • You are going to need some sort of via...

    I suspect you have some clearance issues that Specctra is adhering to.  This is most likely the cause of the failure.

    If you try to hand route from any pin on the BGA do you get errors (in Specctra)?  If so these will prevent the autorouter from completing.

    There are some good "do" files on the Cadence sourcelink to help you get started routing...

Reply

  • You are going to need some sort of via...

    I suspect you have some clearance issues that Specctra is adhering to.  This is most likely the cause of the failure.

    If you try to hand route from any pin on the BGA do you get errors (in Specctra)?  If so these will prevent the autorouter from completing.

    There are some good "do" files on the Cadence sourcelink to help you get started routing...

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