The Joint Test Action Group (JTAG)-SMT4 is a compact, complete, and fully self-contained surface-mount programming module for Xilinx field-programmable gate arrays (FPGAs). The module can be accessed directly from all Xilinx Tools, including Vivado, and Vitis. Users can load the module directly onto a target board and reflow it like any other component.

The JTAG-SMT4 uses a 3.3V main power supply (VDD) and an independent Vref supply to drive the JTAG signals. All JTAG signals use high speed 24mA three-state buffers that allow signal voltages from 1.8V to 3.3V, and bus speeds up to 30MBit/sec. The UART signals are driven directly by the USB controller (referenced to the 3.3V VDD supply) and support bus speeds up to 12Mbaud. The JTAG bus can be shared with other devices as the SMT4 signals are held at high impedance, except when actively driven during programming. The SMT4 module is CE certified and fully compliant with EU RoHS and REACH directives. The module routes the USB D+ (DP) and D- (DM) signals out to pads, providing the system designer with the ability to choose the type of USB connector and its location on the system board.