When an FMC is attached to the VCU128 board FMC+ HSPC connector J18, it is
automatically added to the JTAG chain through the electronically controlled single-pole
single-throw (SPST) switch U72. The SPST switch is in a normally closed state and
transitions to an open state when the FMC is attached. Switch U72 adds an attached FMC
to the FPGA JTAG chain as determined by the FMCP_HSPC_PRSNT_M2C_B
signal.
The JTAG connectivity on the VCU128 board allows a host computer to download bitstreams to the FPGA using the Xilinx tools. In addition, the JTAG connector allows debug tools such as the Vivado® serial I/O analyzer or a software debugger to access the FPGA. The Xilinx tools can also program the Quad SPI flash memory.