SEGGER J-Trace PRO RISC-V — The RISC-V trace probe

J-Trace PRO for RISC-V-based microcontrollers supports tracing on a wide range of RISC-V cores

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.



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.


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-Trace PRO Cortex-A/R/MJ-Trace PRO Cortex-MJ-Trace PRO RISC-V
Hardware features
Power supplyUSBUSBUSB
Download speed into RAM [1]4.0 MB/s4.0 MB/s4.0 MB/s
Max. CPU frequencyUnlimitedUnlimitedUnlimited
Max. TPIU frequency300 MHz300 MHz300 MHz
Max. trace clock frequency150 MHz150 MHz150 MHz
Max. SWO speed100 MHz100 MHz100 MHz
Max. target interface speed50 MHz50 MHz50 MHz
Host interfaces
Target interfaces
Trace interfaces
Buffer TraceVVV
Cortex-M ETM TraceVVX
Cortex-A ETM TraceVXX
Cortex-R ETM TraceVXX
Cortex-A PTM TraceVXX
SiFive Nexus Trace BTMXXV
Unlimited streaming trace + Live analysis [2]VVV
Software features
Flash Download VVV
GDB Server VVV
J-Flash VVV
Ozone VVV
Real-Time Transfer (RTT) VVV
Unlimited Flash Breakpoints VVV
Supported cores
Cortex-A5 D TXX
Cortex-A7  D TXX
Cortex-A8  D TXX
Cortex-A9 D TXX
Cortex-A12 D TXX
Cortex-A15 D TXX
Cortex-A17 D TXX
Cortex-M3D TDTX
Cortex-M4D TDTX
Cortex-M7D TDTX
Cortex-M33D TDTX
Cortex-R4D TXX
Cortex-R5 D TXX
Cortex-R8D TXX
SC000 (M0 secure)DDX
SC300 (M3 secure)DTDTX

V - Supported         D - Debug support: Run control, memory access, etc.          T - Pin trace supported        X - Not supported

[1]  The download speeds listed here are the peak download speeds that can be achieved by the particular J-Trace model. The actual download speed may be lower as it depends on various factors, such as, but not limited to: The selected debug interface & speed, the CPU core and its operating frequency, other devices in the JTAG chain in case JTAG is used as target interface.

[2]  Unlimited streaming trace allows to transmit trace in real time to the PC. While traditional trace only allows to see and analyze the last xxx MB of trace data, with streaming trace it is possible to have all data available. This allows extended debugging features, such as code coverage or CPU load analysis based on a function basis.

  • 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
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
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