SEGGER’s J-Trace PRO can capture complete traces over long periods — thereby enabling the recording of infrequent, hard-to-reproduce bugs. This is particularly helpful when the program flow ‘runs off the rails’ and stops in a fault state.

The J-Trace PRO RISC-V provides support for RISC-V-based microcontrollers. With its superspeed USB 3.0 interface, J-Trace PRO RISC-V enables continuous streaming trace via USB with full trace clock. It enables a far-reaching and complete analysis, offering fast and efficient data analysis, ensuring higher productivity while also lowering development risks and costs.

Key features

  • Streaming trace probe with SuperSpeed USB3.0 interface and Gigabit Ethernet
  • Download speed up to 4 MB/s
  • Unlimited breakpoints in flash memory (Flash Breakpoints)
  • Use with Ozone and J-Flash
  • Real-time streaming trace at full System Clock
  • Fine-tune applications with Live Code Profiling
  • Instruction-level code coverage to satisfy regulatory requirements
  • Unlimited trace to isolate & identify hidden code defects
  • Supports RISC-V targets
  • Full J-Link debug functionality


J-Trace Pinout Details

J-Trace has two connectors. The pinout of the debug and trace connector is in the SEGGER knowledge base. The debug connector is for debug only and can be used with target adapters for J-Link.

Please note, that only one connector can be used at a time!

Supported devices

SEGGER’s J-Trace PRO RISC-V supports tracing on all E-Series SiFive RISC-V cores with the BTM trace module.


All software is included free of charge.


As a multi-platform solution, J-Trace PRO RISC-V 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 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-Trace.


Up to 4 MB/s download speed make J-Trace PRO the fastest trace probe on the market.

Flash Breakpoints

The J-Trace PRO RISC-V comes with an additional feature, called Unlimited Flash Breakpoints, which allows the user to set an unlimited number of breakpoints when debugging in flash memory.

Ozone — The multi-platform debugger and performance analyzer

Ozone is a full-featured graphical debugger for embedded applications. It includes all well-known debug controls and information windows, and enables the best performance of J-Link debug probes and J-Trace trace probes. With Ozone it is possible to debug any embedded application on C/C++ source and assembly level.

Instruction tracing

With streaming trace data users get deep insights into any application running on the target device whilst offering additional, powerful debug strategies to apply. It enables a far-reaching, yet complete, analysis of such issues, offering fast and efficient data analysis, ensuring higher productivity and also lowering development risks and costs.

Live Code Profiling

Code profiling details which instructions have been executed and how often. Users can address application runtime hotspots and identify opportunities to optimize them. It is all about measuring the execution time and frequency of functions, blocks and instructions and highlighting where computing time is spent. These profiles can later be exported using a tool like the Ozone debugger, for documentation and analysis purposes.

J-Link Live Code

Live Code Profiling with J-Trace PRO

Live Code Coverage

Through Live Code Coverage, engineers gain fully accurate information about how much of a source line, block, function, or file has been executed on a target application. It is this information that makes it possible to detect code that hasn’t been covered by tests — even code that may be unreachable. This enables a fast and efficient way to improve the code or to create a suitable test suite for uncovered blocks.

J-Link Live Code Coverage

Live Code Coverage using J-Trace PRO and Ozone

Trace reference boards

Trace reference boards are optimal for simple and portable trace demos. These boards allow testing and verification of trace setups within minutes. They can also be used as a reference for custom hardware projects as the trace reference boards are optimized for best trace signal quality.

All trace reference boards come with an example project that runs out-of-the-box. For easy setup the boards can be powered using a J-Trace PRO V2 or later.

J-Link Trace Reference Board

The Cortex-M Trace Reference Board

Technical specifications

Supported OSMicrosoft Windows (x86/x64), Linux (x86/x64/Arm), macOS (x86/Apple M1)
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)123mm x 68mm x 30mm
Weight (without cables)(without cables) 120g
Available interfaces
Ethernet interfaceGigabit
USB interfaceUSB 3.0, SuperSpeed
Target interfaceJTAG/SWD 20-pin (14-pin adapter available)
JTAG/SWD + Trace 19-pin
JTAG/SWD interface, electrical
Power supplyUSB-powered (max. 400mA)
Target interface voltage (VIF)1.2V … 5V
LOW level input voltage (VIL)VIL <= 40% of VIF
HIGH level input voltage (VIH)VIH >= 60% of VIF
JTAG/SWD interface, timing
Data input rise time (Trdi)Max. 20ns
Data input fall time (Tfdi)Max. 20ns
Data output rise time (Trdo)Max. 10ns
Data output fall time (Tfdo)Max. 10ns
Clock rise time (Trc)Max. 10ns
Clock fall time (Tfc)Max. 10ns
Trace interface, electrical
Power supplyUSB-powered (max. 400mA)
Target interface voltage (VIF)1.2V … 5V
Voltage interface low pulse (VIL)Max. 40% of VIF
Voltage interface high pulse (VIH)Min. 60% of VIF
Trace interface
Max. trace clock frequency150 MHz

Package content

J-Trace Cortex-M
Ethernet Cable
20pin_0.5 target ribbon cable
20Pin Target Ribbon
USB 3.0 Cable

J-Trace PRO Cortex-M

Ethernet cable

20-pin, 0.5″ target ribbon cable

20-pin, 0.1″ target ribbon cable

USB 3.0 cable