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J-Link Ultra

J-Link Ultra - Emulator for ARM and Cortex-M3 cores

J-Link Ultra is a JTAG/SWD emulator designed for ARM/Cortex and other supported CPUs. It is fully compatible to the standard J-Link and works with the same PC software.

Based on the highly optimized and proven J-Link, it offers even higher speed as well as target power measurement capabilities due to the faster CPU, built-in FPGA and High speed USB interface.

It connects via USB to a PC running Microsoft Windows 2000, Windows XP, Windows 2003, Windows Vista or Windows 7. J-Link Ultra has a built-in 20-pin JTAG/SWD connector.


  • Fully compatible to the standard J-Link
  • Very high performance for all supported CPU cores
  • Hi-Speed-USB 2.0 interface
  • Serial Wire Debug supported
  • Serial Wire Viewer (SWV) supported
  • SWV: UART and Manchester encoding supported
  • SWO sampling frequencies up to 25 MHz
  • Target power can be supplied
  • Target power consumption can be measured with high accuracy.
  • Direct download into flash memory of most popular microcontrollers supported
  • Any ARM7/ARM9/ARM11, Cortex-M0/M1/M3 core support, including thumb mode
  • Automatic core recognition
  • JTAG speed up to 25 MHz
  • Seamless integration into the IAR Embedded Workbench IDE
  • No power supply required, powered through USB
  • Support for adaptive clocking
  • All JTAG signals can be monitored, target voltage can be measured
  • Support for multiple devices
  • Fully plug and play compatible
  • Standard 20-pin JTAG connector
  • Wide target voltage range: 1.8V - 5.0V
  • USB and 20-pin ribbon cable included
  • Memory viewer (J-Mem) included
  • TCP/IP server included, which allows using J-Link via TCP/IP networks
  • RDI interface available, which allows using J-Link with RDI compliant software
  • Flash programming software (J-Flash) available
  • Flash DLL available, which allows using flash functionality in custom applications
  • Software Developer Kit (SDK) available
  • Embedded Trace Buffer (ETB) support
  • Optical isolation adapter available
  • Target power supply: J-Link can supply up to 300 mA to target with overload protection


Being fastest in its class, the regular J-Link already sets a very high standard for debugging and download performance.

J-Link Ultra raises the bar even higher, aiming to be the fastest emulator available!

SSince the PC-Software, form factor and connectors are the same as for the regular J-Link, it can be used with any software compatible with J-Link and any adapter, such as the JTAG-isolator.
Just like for the regular J-Link, the Flash Breakpoints option for enhanced debugging of programs running in the flash of microcontrollers is available.

The J-Link is natively supported by IAR EWARM, KEIL µVision, Rowley Crossworks, and CodeSourcery G++. With the RDI and GDB-Server extensions, the supported tool-chains also include Atollic TrueStudio, Yagarto, and other RDI or GDB compatible development environments. If your development environment does not supply a Flash Loader for your device, the J-Link Ultra includes flash loaders designed for all popular devices with internal Flash.

The Flash Breakpoints option allows the user to set an unlimited number of breakpoints while debugging within a device’s internal flash memory. This overcomes the hardware breakpoint limitations present in most common microcontrollers (2 on ARM7/9, 4 on Cortex-M0, typically 6 on Cortex-M3 and 8 on Renesas RX).


Model Overview

There is a J-Link or J-Trace model available to fit all project needs. J-Trace is a full superset of J-Link with the added benefit of trace capabilities. J-Trace models are designed for one particular family of cores.

Available models vary in price, speed, and other hardware features such as built-in trace memory and on-board Ethernet, as well as advanced software features. The advanced sotware features are:

  • J-Flash (High-speed production grade flash programming software)
  • J-Link Unlimited Flash Breakpoints (Unlimited number of breakpoints while debugging in flash memory)
  • J-Link RDI (Support for RDI compatible debuggers)
Model Download Speed into RAM Download into Flash GDB Server Unlimited Flash Breakpoints J-Flash RDI Ethernet
J-Link PRO 3.0 MBytes/sec
J-Link ULTRA+ 3.0 MBytes/sec
J-Link PLUS 1.0 MBytes/sec
J-Link 1.0 MBytes/sec
J-Link EDU 800 KBytes/sec
Debug probes with built-in Trace memory
J-Trace Cortex-M 3.0 MBytes/sec
J-Trace ARM 800 KBytes/sec



Supported OS Microsoft Windows 2000
Microsoft Windows XP
Microsoft Windows XP x64
Microsoft Windows 2003
Microsoft Windows 2003 x64
Microsoft Windows Vista
Microsoft Windows Vista x64
Windows 7
Windows 7 x64
Electromagnetic compatibility (EMC) EN 55022, EN 55024
Operating temperature +5°C ... +60°C
Storage temperature -20°C ... +65 °C
Relative humidity (non-condensing) Max. 90% rH
Size (without cables) 100mm x 53mm x 27mm
Weight (without cables) 73g
Available Interfaces
USB interface USB 2.0, Hi-Speed
Target interface JTAG/SWD 20-pin
External (SPI) analog power measurement interface 4-pin (Pins 14, 16, 18 and 20 of the 20-pin JTAG/SWD interface)
JTAG/SWD Interface, Electrical
Target interface voltage (VIF) 1.8V ... 5V
Target supply voltage 4.5V ... 5V
Target supply current Max. 300mA
Reset type Open drain. Can be pulled low or tristated
Reset low level output voltage VOL <= 10% of VIF
For the whole target voltage range (1.8V <= VIF <= 5V)
LOW level input voltage (VIL) VIL <= 40% of VIF
HIGH level input voltage (VIH) VIH >= 60% of VIF
For 1.8V >= VIF <= 3.6V
LOW level output voltage (VOL) with a load of 10 kOhm VOL <= 10% of VIF
HIGH level output voltage (VOH) with a load of 10 kOhm VOH >= 90% of VIF
For 3.6 <= VIF <= 5V
LOW level output voltage (VOL) with a load of 10 kOhm VOL <= 20% of VIF
HIGH level output voltage (VOH) with a load of 10 kOhm VOH >= 80% of VIF
JTAG/SWD Interface, Timing
SWO sampling frequency Max. 25 MHz
Data input rise time (Trdi) Trdi <= 20ns
Data input fall time (Tfdi) Tfdi <= 20ns
Data output rise time (Trdo) Trdo <= 10ns
Data output fall time (Tfdo) Tfdo <= 10ns
Clock rise time (Trc) Trc <= 10ns
Clock fall time (Tfc) Trc <= 10ns
Analog power measurement interface
Sampling frequency 50 kHz
Resolution 1 mA
External (SPI) analog interface
SPI frequency Max. 4 MHz
Samples / sec Max. 50000
Resolution Max. 16-bit



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MicroWay Pty Ltd
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Crows Nest, NSW 1585, Australia
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email: sales@microway.com.au
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PO Box 912026
Victoria Street West
Auckland 1142, New Zealand
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