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The joint test action group (JTAG) HS2 programming cable is a high-speed programming solution for Xilinx® field-programmable gate arrays (FPGAs). The cable is fully compatible will all Xilinx tools and can be seamlessly driven from iMPACT™, ChipScope™, and EDK. The HS2 attaches to target boards using Digilent's 6-pin, 100-mil spaced programming header or Xilinx's 2x7, 2mm connector and the included adaptor. 

The PC powers the JTAG-HS2 through the USB port and will recognize it as a Digilent programming cable when connected to a PC, even if the cable is not attached to the target board. The HS2 has a separate Vdd pin to supply the JTAG signal buffers. The high-speed 24mA three-state buffers allow target boards to drive the HS2 with signal voltages from 1.8V to 5V and bus speeds of up to 30MBit/sec. To function correctly, the HS2's Vdd pin must be tied to the same voltage supply that drives the JTAG port on the FPGA. 

The JTAG bus can be shared with other devices as systems hold JTAG signals at high-impedance except when actively driven during programming. The HS2 comes included with a standard Type-A to Micro-USB cable that attaches to the end of the module opposite the system board connector. The system board connector should hold the small and light HS2 firmly in place.

The JTAG-HS3 is the newest member of our family of affordable high-speed Xilinx® FPGA programming solutions. The HS3 builds on the successful JTAG-HS1 by adding an open-drain buffer to pin 14 allowing for the debugging of Xilinx Zynq-SOC processors. It can be attached to target boards using Xilinx's 2x7 connector*, and is compatible with all Xilinx tools, including iMPACT™, ChipScope™, and EDK. 

When connected to a PC via a standard A to micro-USB cable, the JTAG HS3 receives its power from USB and can be recognized as a Digilent programming cable, even if the HS3 is not attached to the target board. The JTAG bus can be shared with other devices as the HS3's signals are held in high-impedance, except when actively driven during programming. The HS3 is small and light, allowing it to be held firmly in place by the system board connector. 

* This is a unique programming header and is not compatible with the 1x6 MTE Digilent JTAG Connector.

Product Title

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. 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.

JTAG SMT2