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  1. #1
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    Building a programming cable for Xilinx CPLD / FPGA

    Hi,

    I am planning to build a cheap programming cable for Xilinx CPLDs/ FPGAs. I found one in the internet here. But I was confused with the cable wiring diagram. For FPGAs and CPLDs the programming pins are TDI, TDO, TMS and TCK. I could not find all the pins in the diagram. Are they renamed with other names here. Alternatively, does anyone know of any other simple DIY programmer.

    Thanks,
    Hobbyiclearner

    •   Alt6th June 2017, 08:37

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  2. #2
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    Re: Building a programming cable for Xilinx CPLD / FPGA

    You apparently overlooked the programmer schematic on this site. It does the 5 to 3.3V level translation and connects to JTAG interface.



    •   Alt6th June 2017, 11:39

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  3. #3
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    Re: Building a programming cable for Xilinx CPLD / FPGA

    OK. In simple words I hope that the programmer will work for CPLD/ FPGA programming?

    Regards,
    Hobbyiclearner



    •   Alt7th June 2017, 07:15

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  4. #4
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    Re: Building a programming cable for Xilinx CPLD / FPGA

    OK.. I found the ckt in an Xilinx application notes here. So I suppose it should work. I wanted to modify it to add a status LED to indicate if the programming cable works. Does anyone suppose that if I added a LED + resistor in parallel to 5 v supply, will the programmer continue working and indicate that it is getting power supply from FPGA/CPLD side (snapshot of modification attached.)Attachment 139405

    Pls. advise.

    Thanks,
    Hobbyiclearner



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