JTAG SMT2 Resource Center

Welcome to the resource center for the JTAG SMT2!

Here you will find all the reference materials that Digilent has created for the JTAG SMT2, as well as links to any external content we have tracked down. If you are interested in purchasing the JTAG SMT2, visit the product page on our main website: JTAG SMT2

The Joint Test Action Group (JTAG)-SMT2 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 iMPACT™, ChipScope™, and EDK. Users can load the module directly onto a target board and reflow it like any other component.

The JTAG SMT2 uses a 3.3V main power supply and a separate 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 5V and bus speeds of up to 30MBit/sec. The JTAG bus can be shared with other devices as systems hold JTAG signals at high-impedance, except when actively driven during programming. The SMT2 module is CE certified and fully compliant with EU RoHS and REACH directives. The module uses a standard Type-A to Micro-USB cable available for purchase from Digilent, Inc.

Users can connect JTAG signals directly to the corresponding FPGA signals as shown in Figure 1. For best results, mount the module adjacent to the edge of the host PCB over a ground plane. Although users may run signal traces on top of the host PCB beneath the SMT2, Digilent recommends keeping the area immediately beneath the SMT2 clear. Note: Keep the impedance between the SMT2 and FPGA below 100 Ohms to operate the JTAG at maximum speed. The SMT2 improves upon the SMT1 with the addition of three general purpose IO pins (GPIO0 – GPIO2) and support for interfacing IEEE 1149.7-2009 JTAG targets in both 2 and 4-wire modes.

NOTE: This cable is not needed for Digilent FPGA boards as our boards are designed with this functionality natively.


  • Schematic – Schematic currently unavailable, please see the reference manual for product detail
  • Reference ManualWiki PDF
    • Technical description of the JTAG SMT2 and all of its features. The Wiki may contain more up-to-date information than the PDF.
  • Sell SheetPDF
  • 3D CAD modelZIP
    • 3D CAD model provided as PNG and STP files.

Product Compliance

  • HTC: 8471801000
  • ECCN: EAR99