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  1. #1
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    problem with programming the xilinx fpga

    Hey guys
    I have used XC6SLX9-3TQG144I in my design. according to data sheet the jtag circuit must be like the illustrated image. I have implemented it in my board.
    Click image for larger version. 

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    my problem is that when fpga is not programmed (after connecting power supply) I can program my board successfully. done pin goes high. but after that I can not connect to board with jtag interface. I can not use chipscope. I also can not reprogram it again. could you please tell me what i should do?

    thanks a lot.

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  2. #2
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    Re: problem with programming the xilinx fpga

    Do you have any bitstream security turned on?


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  3. #3
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    Re: problem with programming the xilinx fpga

    thanks for your attention. no i don't have.



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    Re: problem with programming the xilinx fpga

    What kind of message do you get from your programming tool or chip scope? Are you using Impact to program the part? What programmer are you using?

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    Another thought: (this happened to someone I know) if you’ve inadvertently assigned an io port as an output driving low, but it’s connected, say, to a power supply rail, you could be dragging the supply down.


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    Re: problem with programming the xilinx fpga

    Thanks barry for your reply. I found the problem. the problem was the program pin of FPGA was not pulled up.



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