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    USB Device(USB-JTAG Programmer) Not Recognized in my desktop

    Discussion in 'Desktop Hardware' started by hangnan, May 24, 2017.

  1. hangnan

    hangnan Newbie

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    I'd designed a USB-JTAG Programmer with FT2232D( http://www.kynix.com/Detail/108466/FT2232D.html). I programmed Xilinx spartan3 FPGA 2 times yesterday and everything was perfect. But today when I connect it to my desktop I see the following message: "USB device not recognized"

    [​IMG]
    [​IMG]

    I saw a post about same problem: "If enumeration is failing, something in the hardware is broken. This could be a damaged chip (make sure you always power the chip completely , so don't let VCCIO be unpowered if you power VCC)."

    I've connected the VCCIO of the FT2232D to the VCC of the FPGA board with a jumper, so when the FPGA board is off VCCIO can be unpowered.

    Can anyone tell me wheather my chip is damaged or not? Or how I can check it?

    Here is my board's schematic:

    [​IMG]
    (board schematic)
     
    hangnan, May 24, 2017
    #1