Digilent 210-203P User Manual

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

JTAG-SMT1™ Programming Module for Xilinx® FPGAs

Revised March 2, 2015
This manual applies to the JTAG-SMT1 rev. A

DOC#: 502-203

Copyright Digilent, Inc. All rights reserved.

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 5

21.5mm

23 mm

1
2
3
4

8
7
6
5

GND

TCK

TDI

TMS

Vdd (3.3V)
GND
VREF
TDO

The JTAG-SMT1.

 Small, complete, all-in-one JTAG programming solution for

Xilinx FPGAs

 Single 3.3V supply
 Separate Vref drives JTAG 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

 Able to drive JTAG bus at up to 30Mbit/sec
 JTAG/TCK frequency settable by user
 Compatible with all Xilinx tools
 Small form-factor surface-mount module can be directly

loaded on target boards

 Uses micro-AB USB2 connector
 Same circuit is available as a stand-alone programming cable;

see Digilent’s JTAG-HS1.

Features include:

Overview

The JTAG-SMT1 is a compact, complete, and fully self-contained surface-mount programming module for Xilinx®
FPGAs. It can be accessed directly from all Xilinx Tools, including iMPACT, ChipScope™, and EDK. The module can
be loaded directly onto a target board and reflowed like any other component.

The JTAG-SMT1 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. JTAG signals are actively driven only during a programming event and are otherwise held in high­impedance, so the JTAG bus can be shared with other devices.

The SMT1 module is CE certified and fully compliant with the RoHS and REACH directives. It uses a standard Type-A
to Micro-USB cable, also available from Digilent.

The JTAG signals can be connected directly to the corresponding FPGA signals, as shown in the image below. For
best results, the module should be mounted adjacent to the edge of the host PCB over a ground plane. Although
signal traces may be run on top of the host PCB beneath the SMT1, it is recommended the area immediately
beneath the SMT1 be kept clear. For highest speed JTAG operation, impedance between the SMT1 and FPGA
should be kept below 100 Ohms.

JTAG-SMT1 Programming Module for Xilinx® FPGAs

Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.

Page 2 of 5

TCK

JTAG SMT1 FPGA

TMS

TDI

TDO

GND

Vref

VIO
TMS
TCK
TDI
TDO

3.3V
V

IO

GND

Vdd

USB2

Port

2

4

3
5

1

6

8

SMT1 JTAG Port Connections

2 3 41

6 578

3.5mm

2.5mm

5mm4mm

20mm

PCB Edge

Recommended PCB pad geometry

15mm

23mm

21.5mm

3mm

5mm

2mm

4mm

17.5mm

SMT1 bottom-up view

Software Support

In addition to working seamlessly with all Xilinx tools, the SMT1 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 SDK, custom applications can be created to drive JTAG ports on virtually any device. The SDK also
supports SPI ports, allowing applications to drive any SPI device using SPI Mode 0 or Mode 2. Please see the Adept
SDK reference manual for more information.

Mechanical Information