J-Link Pro
The ultra-fast debug probe with Ethernet
J-Link Pro is SEGGER's versatile JTAG/SWD programming and debug probe with USB and Ethernet interfaces.
Overview
J-Link Pro is fully compatible with J-Link and can be used "out-of-the-box". J-Link Pro uses DHCP per default. The built-in web server makes manual configuration easy. Ethernet allows the use of the debug probe far away from the PC, over a hardwired or wireless network, in a development or production environment. It also makes download and debugging speeds higher and provides electrical isolation from the PC. The product also comes with all features of the regular J-Link.
Key features
- Additional Ethernet interface
- Download speed up to 4 MB/s
- Unlimited breakpoints in flash memory (Flash Breakpoints)
- Use with Ozone, RDI/RDDI and J-Flash
- Additional LEDs for power and RESET indication
- Comes with web interface for easy TCP/IP configuration (built-in webserver)
- Built-in VCOM functionality
- Supports a broad range of microcontrollers
- Supports direct download into RAM and flash memory
- Free software updates
Supported devices
The J-Link Pro as a member of the SEGGER J-Link debug probes supports a wide range of CPU cores. The list of supported manufacturers, families, and devices and SoCs includes tens of thousands of devices in hundreds of device families.
Device not listed? Please don’t hesitate to contact us.
Software
All software is included free of charge. It comes with licenses for all J-Link related SEGGER software products, such as J-Link Unlimited Flash Breakpoints, Ozone, RDI/RDDI, J-Flash, J-Link GDB Server, providing the optimum debugging solution for professional developers.
The J-Link Software and Documentation Package is available here:
Multi-platform
As a multi-platform solution, J-Link Pro comes with the setup and control software for Linux, macOS and Windows. Software and firmware updates are included. Similarly, use on all currently supported target devices, and any that will be added, is also included.
J-Flash
J-Flash is a part of the J-Link Software and Documentation Package and allows the programming of the internal and external flash memory of a microcontroller-based embedded system via J-Link.
Speed
Up to 4 MB/s download speed make J-Link Pro the fastest debug probe on the market. Using TCP/IP instead of USB eliminates latencies from USB usage, resulting in higher debugging speed.
Ethernet
J-Link Pro provides an Ethernet interface as an alternative to USB connection.
Flexibility
Due to the Ethernet interface, long distances between the development PC and the target system are possible. You can set a default gateway for J-Link Pro making it also possible to use it in large intranets.
Safety (galvanic isolation)
Ethernet signal lines provide galvanic isolation of J-Link Pro (and so the target system) from the network and development PC.
Flash Breakpoints
The J-Link Pro comes with an additional feature, called Unlimited Flash Breakpoints. Unlimited Flash Breakpoints allow the user to set an unlimited number of breakpoints when debugging in flash memory.
Ozone — The J-Link debugger
Standalone debugger
Ozone focuses on debugging. There are no compiler or project window distractions. All debug windows can be moved, resized and docked, to provide you with the workspace you need.
Ozone offers all well-known debug controls and information windows, and more. Instruction trace, power graph, live watches, and real-time terminal I/O further extend these capabilities.
Performance analyzer
With J-Link's High-Speed Sampling technology, Ozone can sample and visualize an embedded system's variables over time. Checking values and flags in the debugger, while the target keeps running, is easy.
J-Link's power measurement features enable you to record the power consumption of your target device in a debug session. This is especially helpful when you are developing a low-power device and need to know how power consumption changes when you enable or disable certain components.
Use case
Building a test farm with J-Link Pro
The J-Link Pro is ideally suited for the construction of a test farm. Also known as a board farm or a device farm, it consists of a number of boards or devices connected to a network via debug probes. It is an efficient way to share hardware, including with users in remote locations.
For any successful product, as the number of devices to be tested grows, a test farm becomes the only efficient way to ensure quality.
Using SEGGER’s Test Farm Power Adapter, the power supply of test devices can be controlled remotely. This enables automated reboot for the testing process as well as the ability to turn off devices not in use. In combination with the power-saving J-Link Pro, this makes it easy to build energy-efficient, large-scale test farms.
A J-Link Pro test farm can connect many of the same test devices or can connect completely different ones.
For more information, see SEGGER’s wiki article discussing "What is a test farm?".
Wireless debugging/telemetry
The J-Link Pro can be used for a wireless connection between monitoring/debugging PC and the target device. To achieve this, the J-Link Pro needs to be connected to a WiFi router or switch.
Learn more at: https://kb.segger.com/Using_J-Link_via_WiFi#Via_WiFi_bridge
Media gallery
Product photos
Videos
Mar. 2022 | 5:24 min
J-Link — J-Link Configurator
Mar. 2022 | 7:48 min
J-Link — J-Link Commander
Mar. 2019 | 4:35 min
J-Link Remote Server — Intro
Jan. 2022 | 4:02 min
J-Link — Performance analysis
Aug. 2016 | 1:33 min
BBC micro:bit J-Link Upgrade — Intro
Technical specifications
| General | ||||||||
|---|---|---|---|---|---|---|---|---|
| Supported OS | Microsoft Windows (x86/x64), Linux (x86/x64/Arm), macOS (x86/Apple Silicon) | |||||||
| Electromagnetic compatibility (EMC) | EN 55024, EN 55032 | |||||||
| Operating temperature | +5°C ... +60°C | |||||||
| Storage temperature | -20°C ... +65 °C | |||||||
| Relative humidity (non-condensing) | Max. 90% rH | |||||||
| Mechanical | ||||||||
| Size (without cables) | 100mm x 53mm x 27mm | |||||||
| Weight (without cables) | 73g | |||||||
| Available interfaces | ||||||||
| Ethernet interface | 100 Mbit/s | |||||||
| USB interface | USB 2.0 (Hi-Speed) | |||||||
| Target interface | JTAG/SWD 20-pin | |||||||
| JTAG/SWD interface, electrical | ||||||||
| Target interface voltage (VIF) | 1.2V ... 5V | |||||||
| Current drawn from target voltage sense pin (VTRef) | < 25µA | |||||||
| Target supply voltage | 5V (derived from USB voltage) | |||||||
| Target supply current | Max. 300mA | |||||||
| Reset type | Open drain with 100 Ohms series resistor. Can be pulled low or tristated | |||||||
| Reset low level output voltage | VOL <= 10% of VIF | |||||||
| For the whole target voltage range (1.2V <= VIF <= 5V) | ||||||||
| LOW level input voltage (VIL) | VIL <= 40% of VIF | |||||||
| HIGH level input voltage (VIH) | VIH >= 60% of VIF | |||||||
| For 1.2V >= VIF <= 3.6V | ||||||||
| 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 | |||||||
| 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 | ||||||||
| Target interface speed | Max. 50 MHz | |||||||
| SWO sampling frequency | Max. 100 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 <= 3ns | |||||||
| Clock fall time (Tfc) | Trc <= 3ns | |||||||
| Analog power measurement interface | ||||||||
| Sampling frequency | 200 kHz | |||||||
| Resolution | 50 uA | |||||||
Package content
FAQ
Q: Can I use J-Flash with J-Link Pro?
A: Yes. J-Link Pro comes with a license for J-Flash preinstalled on the probe itself. No license setup necessary, simply plug in J-Link Pro and start using J-Flash.
Q: What is the advantage of J-Link versus simple probes such as FTDI-based systems?
A: J-Link has numerous advantages: the actual J-Link software supplied by SEGGER (which enables use with common IDEs), the availability of Unlimited Flash Breakpoints for the debugging of software which runs in the flash of microcontrollers, it’s high speed and it’s simple, fast download into flash memory.
In contrast to most simple probes, J-Link supports adaptive clocking as well as SWD and SWO. It also functions more stably, since it is not just a dump USB to JTAG converter. Instead, it uses the intelligence of the built-in CPU which provides more robust communication. This is especially so in situations where the target CPU runs at low clock speeds.
Q: May I work with more than one J-Link at the same time, on the same machine?
A: Yes, you can connect an unlimited number of J-Links to your PC. No special configuration required; each J-Link is registered with its unique serial number on the PC. This enables you to have multiple J-Links connected at once.
Q: I have multiple Arm cores in my JTAG chain. How can I debug them (simultaneously) with J-Link?
A: That's simple: Two or more debuggers can use the same J-Link simultaneously. Multi-core debugging requires multiple debuggers or multiple instances of the same debugger. You need to tell your debugger which device in the scan chain you want to debug. Additional special settings are not required.
Q: Does J-Link support the Embedded Trace Buffer (ETB)?
A: Yes. J-Link supports ETB on Cortex-M3/M4/M7 and Cortex-A/R (if implemented by target device).
Q: Does J-Link support the Micro Trace Buffer (MTB)?
A: Yes.
Q: Does J-Link support the Embedded Trace Macrocell (ETM)?
A: No. ETM requires another connection to the Arm chip and a CPU with built-in ETM. ETM is supported by the J-Trace product family.
Q: What is the maximum voltage that can be handled by the galvanic isolation of the Ethernet?
A: The Ethernet data lines are isolated as required per IEEE 802.3 (test voltage 1500 Vrms for one minute). Note that this is NOT valid for the Ethernet shield that has a direct electrical contact to the USB shield and a resistive and capacitive coupling to probe GND. For an effective isolation, you need to use an unshielded twisted pair Ethernet cable.
