The JTAG-HS1 programming cable is a high-speed programming solution for Xilinx® FPGAs. It is fully compatible will all Xilinx tools, and can be seamlessly driven from iMPACT™, ChipScope™, and EDK. The HS-1 attaches to target boards using Digilent’s 6-pin, 100-mil spaced programming header, or Xilinx’s 2×7, 2mm connector (using the included adaptor).

The JTAG-HS1 is powered from a PC’s USB port, and will be recognized as a Digilent programming cable when connected to a PC, whether or not it is attached to the target board. A separate Vdd pin is provided on the HS1 to supply JTAG signal buffers. The high speed, 24mA, three-state buffers allow target boards to drive the HS1 with signal voltages from 1.8V to 5V, with bus speeds of up to 30MBit/sec. The HS1’s Vdd pin must be tied to the same voltage supply that drives the JTAG port on the FPGA.

JTAG signals are held in high-impedance except when actively driven during programming, so the JTAG bus can be shared with other devices. The HS1 uses a standard Type-A to Micro-USB cable (included with the HS1) that attaches to the end of the module opposite the system board connector. The HS1 is small and light, allowing it to be held firmly in place by the system board connector.

  • Small, complete, all-in-one JTAG programming solution for Xilinx FPGAs
  • Separate Vref drives JTAG/SPI signal voltages; Vref can be any voltage between 1.8V and 5V.
  • High-Speed USB2 port that can drive JTAG/SPI bus at up to 30Mbit/sec
  • JTAG/SPI frequency settable by user
  • Compatible with all Xilinx tools
  • Uses micro-AB USB2 connector
  • SPI programming solution (modes 0 and 2 supported)
  • Fully supported by the Adept SDK, allowing custom JTAG/SPI applications to be created

Software Support

In addition to working seamlessly with all Xilinx tools, the HS1 is supported by Digilent’s Adept software and the Adept SDK (the SDK can be freely downloaded from Digilent’s website). Adept includes a full-featured programming environment, and a set of public APIs that allow user applications to directly drive the JTAG chain.

Using the Adept SDK, custom applications can be created to drive JTAG ports on virtually any device. The HS1 also supports SPI modes 0 and 2. By using the API’s provided by the SDK applications can drive any SPI device supporting those modes. Please see the Adept SDK reference manual for more information.

The HS1 is also supported by Digilent’s AVR programmer that can target any AVR device.

Absolute Maximum Ratings

Symbol Parameter Condition Min Max Unit
Vdd Operating supply voltage -0.3 4.0 V
Vref I/O reference/supply voltage -0.3 6 V
VIO Signal Voltage -0.3 6 V
Iik,Iok TMS, TCK, TDI, TDO, DC Input/Output Diode Current VIO < -0.3V -50 mA
VIO > 6V +20
Iout DC Output Current ±50 mA
Tstg Storage Temperature -20 +120 ºC
ESD Human Body Model JESD22-A114 2000 V
Charge Device Model JESD22-C101 500 V

DC Operating Characteristics

Symbol Parameter Min Typ Max Unit
Vdd Operating supply voltage 2.97 3.3 3.63 Volts
Vref I/O reference/supply voltage 1.65 2.5/3.3 5.5 Volts
TDO Input High Voltage (VIH) 0.75 x Vref 5.5 Volts
Input Low Voltage (VIL) 0 0.25 x Vref Volts
TMS, TCK, TDI Output High (VOH) 0.85 x Vdd 0.95 x Vdd Vdd Volts
Output Low (VOL) 0 0.05 x Vdd 0.15 x Vdd Volts

AC Operating Characteristics

HS1 JTAG/SPI signals are driven according to the timing diagram below. TCK frequencies from 30MHz to 8 KHz are supported, at integer divisions of 30MHz from 1 to 3750. Common frequencies include 30MHz, 15MHz, 10MHz, 7.5MHz, and 6HMz.

Symbol Parameter Min Max
Tck Tck period 33ns 2.185ms
Tckh, Tckl Tclk pulse width 20ns 1.1ms
Tcd Tclk to TMS, TDI 0 15ns
Tsu TDO Setup time 19ns
Thd TDO Hold time 0

Design Notes

The HS1 is designed to drive JTAG/SPI signals on target boards that have less than 100ohms of series resistance. Higher resistance may result in degraded operation.

Supported Target Devices

The JTAG-HS1 is capable of targeting the following Xilinx devices:

  1. Xilinx FPGAs
  2. Xilinx Zynq-7000
  3. Xilinx CoolRunner™/CoolRunner-II CPLDs
  4. Xilinx Platform Flash ISP configuration PROMs
  5. Select third-party SPI PROMs
  6. Select third-party BPI PROMs

The following devices cannot be targeted by the JTAG-HS1:

  1. Xilinx 9500/9500XL CPLDs
  2. Xilinx 1700 and 18V00 ISP configuration PROMs
  3. Xilinx FPGA eFUSE programming

Remote device configuration is not supported for the JTAG-HS1 when used with Xilinx’s iMPACT software. Note: Please see the “Introduction to Indirect Programming – SPI or BPI Flash Memory” help topic in iMPACT for a list of supported FPGA/PROM combinations. Note: Please see the “Configuration Memory Support” section of Xilinx UG908 for a list of the FPGA/PROM combinations that Vivado supports.