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TM4C EPI-Fpga interface Problem.We are doing FPGA-EPI INTERFACE IN gpmode .

Krishnan G Nair
Expert 1235 points

Hello,

We are using GPMODE fpga INTERFACE BETWEEN CONTROLLER AND FPGA. Controller PIN is made up using

GPIOPinWrite(GPIO_PORTK_BASE, GPIO_PIN_4, GPIO_PIN_4);
GPIOPinTypeGPIOOutput(GPIO_PORTK_BASE, GPIO_PIN_4);

But before this a glich is coming a( noise type signal) which FPGA IS IDENTIFING,WHY IS IT COMING,HOW CAN IT BE AVOIDED...................

Regards,

Krishnan

  • 0
    TI__Guru**** 244400 points
    Hello Krishnan,

    Till the time the IO is configured the pad is an input. At the same time the FPGA is also an input/ So there is a floating wire which can get coupled to any other trace in the proximity. The simplest solution is to have a Pull Down or Pull Up external to the devices and on the board. Also this is very much dependent on the type of noise that you are seeing.

    Regards
    Amit