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Program FPGA from SDK and FMC

Former Member

Hi,
I have a custom board that is connected to the FMC connector. The board itself houses a chip which gets signals from the FPGA. The board is passive.

When I connect the custom board to the Zedboard, and try to program the FPGA from the Xilinx SDK, I get an error that it can't connect to the zedboard:

ERRORt: FPGA Configuration failed.
Connection to Board Failed


    Unknown Error Occured
    Cable is not powered-on

If I disconnect the custom board and try to program the FPGA, it works.

Please help.

Thanks,
David.

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    If you will look at the schematic referenced above on page 2, there is a circuit that selects the source of the JTAG TDI-USB signal that is connected to the JTAG logic that drives the J17 USB port. If FMC-PRSNT is inactive then the Zynq TDO output (TDO-FPGA) drives the signal and, in that case, the JTAG 'loop' consists only of the Zynq device. If FMC-PRSNT is active then the Zynq TDO output is routed out to the FMC-TDI JTAG signal and the returning FMC-TDO signal drives the TDI-USB signal. This creates a JTAG 'loop' consisting of the Zynq device AND the FMC card JTAG circuit.

     

    If your FMC card does not have an active device with a JTAG interface, or if you do not want to include the FMC cards device in the JTAG chain, the FMC card should provide a jumper or other provision for bypassing the JTAG chain by connecting the FMC-TDO directly to the FMC-TDI signal.

     

    If you do not wish to bypass the JTAG device on your FMC card you can add a description of the FMC card JTAG device (a BSDL file) so that the program driving the JTAG chain, the SDK in the case, understands the registers added to the chain by the additional device.

     

    -Gary

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    If you will look at the schematic referenced above on page 2, there is a circuit that selects the source of the JTAG TDI-USB signal that is connected to the JTAG logic that drives the J17 USB port. If FMC-PRSNT is inactive then the Zynq TDO output (TDO-FPGA) drives the signal and, in that case, the JTAG 'loop' consists only of the Zynq device. If FMC-PRSNT is active then the Zynq TDO output is routed out to the FMC-TDI JTAG signal and the returning FMC-TDO signal drives the TDI-USB signal. This creates a JTAG 'loop' consisting of the Zynq device AND the FMC card JTAG circuit.

     

    If your FMC card does not have an active device with a JTAG interface, or if you do not want to include the FMC cards device in the JTAG chain, the FMC card should provide a jumper or other provision for bypassing the JTAG chain by connecting the FMC-TDO directly to the FMC-TDI signal.

     

    If you do not wish to bypass the JTAG device on your FMC card you can add a description of the FMC card JTAG device (a BSDL file) so that the program driving the JTAG chain, the SDK in the case, understands the registers added to the chain by the additional device.

     

    -Gary

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