ContributionsMost RecentMost LikesSolutionsRe: Possible Compatibility Issue Between Intel Cyclone 10 GX Dev Kit and Xilinx FMC-105-Debug @FvM Thank you so much! Switching S5.1 worked. It seems the FMC was intercepting the JTAG chain. Re: Possible Compatibility Issue Between Intel Cyclone 10 GX Dev Kit and Xilinx FMC-105-Debug I was given the two boards and told to use them together. I thought the person who gave me them would have checked the compatibility before doing so. Thank you for your response @ak6dn. Possible Compatibility Issue Between Intel Cyclone 10 GX Dev Kit and Xilinx FMC-105-Debug I am working with the Cyclone 10 GX Dev Kit and have successfully run programs on it before. I am trying to use the Xilinx FMC to debug signals from the FPGA and eventually communicate with another device. Whenever I have the FMC plugged in to the Cyclone 10 GX, the JTAG chain is broken. It throws an error saying it can only see the USB blaster and not the FPGA device. When I remove the FMC, everything works fine. Is there a hardware compatibility issue here? If yes, what mezzanine cards would work with the Cyclone 10 GX? Xilinx FMC 105 Debug Intel Cyclone 10 GX Dev Kit User Guide