Segger J-Trace Pro Cortex-M

Segger J-Trace Pro Cortex-M

J-Trace PRO for Cortex-M is setting a new standard for trace probes. It enables continuous streaming trace, lifting the limitations by internal buffers and slow data transmission to give you all the insights you need to develop and optimize your code.

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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.

It also supports extended trace features, such as code coverage (so engineers have visibility over which parts of the application code have been executed) and execution profiling (providing visibility as to which instructions have been executed and how often—so hotspots can be addressed and optimization opportunities identified).

Supported OS ValueMicrosoft Windows 7
Microsoft Windows 7 x64
Microsoft Windows 8
Microsoft Windows 8 x64
Microsoft Windows 10
Microsoft Windows 10 x64
Microsoft Windows 2000
Microsoft Windows XP
Microsoft Windows XP x64
Microsoft Windows 2003
Microsoft Windows 2003 x64
Microsoft Windows Vista
Microsoft Windows Vista x64
macOS 10.5 and higher
Electromagnetic compatibility (EMC) ValueEN 55022, EN 55024
Operating temperature Value+5°C ... +60°C
Storage temperature Value-20°C ... +65 °C
Relative humidity (non-condensing) ValueMax. 90% rH
Size (without cables) Value123mm x 68mm x 30mm
Weight (without cables) Value(without cables) 120g
Available Interfaces
Ethernet interface ValueGigabit
USB interface ValueUSB 3.0, SuperSpeed
Target interface ValueJTAG/SWD 20-pin (14-pin adapter available)
JTAG/SWD + Trace 19-pin
JTAG/SWD Interface, Electrical
Power supply ValueUSB powered (max. 400mA)
Target interface voltage (VIF) Value1.2V ... 5V
LOW level input voltage (VIL) ValueVIL <= 40% of VIF
HIGH level input voltage (VIH) ValueVIH >= 60% of VIF
JTAG/SWD Interface, Timing
Data input rise time (Trdi) ValueMax. 20ns
Data input fall time (Tfdi) ValueMax. 20ns
Data output rise time (Trdo) ValueMax. 10ns
Data output fall time (Tfdo) ValueMax. 10ns
Clock rise time (Trc) ValueMax. 10ns
Clock fall time (Tfc) ValueMax. 10ns
Trace Interface, Electrical
Power supply ValueUSB powered (max. 400mA)
Target interface voltage (VIF) Value1.2V ... 5V
Voltage interface low pulse (VIL) ValueMax. 40% of VIF
Voltage interface high pulse (VIH) Value Min. 60% of VIF
Trace Interface
 Max. trace clock frequency Value150 MHz

19-Pin JTAG/SWD and Trace Connector

J-Trace provides a JTAG/SWD+Trace connector. This connector is a 19-pin connector. It connects to the target via a 1-1 cable. The following table lists the J-Link / J-Trace SWD pinout.

Pin 1 SignalVTref TypeInput Description This is the target reference voltage. It is used to check if the target has power, to create the logic-level reference for the input comparators and to control the output logic levels to the target. It is normally fed from Vdd of the target board and must not have a series resistor.
Pin 2 SignalSWDIO/ TMS TypeI/O / output DescriptionJTAG mode set input of target CPU. This pin should be pulled up on the target. Typically connected to TMS of the target CPU.
Pin 4 SignalSWCLK/TCK TypeOutput DescriptionJTAG clock signal to target CPU. It is recommended that this pin is pulled to a defined state of the target board. Typically connected to TCK of the target CPU.
Pin 6 SignalSWO / TDO Type Input Description JTAG data output from target CPU. Typically connected to TDO of the target CPU.
--- Signal--- Type--- DescriptionThis pin (normally pin 7) is not existent on the 19-pin JTAG/SWD and Trace connector.
Pin 8 SignalTDI Type Output DescriptionJTAG data input of target CPU.- It is recommended that this pin is pulled to a defined state on the target board. Typically connected to TDI of the target CPU.
Pin 9 SignalNC TypeNC DescriptionNot connected inside J-Link. Leave open on target hardware.
Pin 10 SignalnRESET TypeI/O DescriptionTarget CPU reset signal. Typically connected to the RESET pin of the target CPU, which is typically called "nRST", "nRESET" or "RESET".
Pin 12 SignalTRACECLK TypeInput DescriptionInput trace clock. Trace clock = 1/2 CPU clock.
Pin 14 Signal TRACEDATA[0] TypeInput DescriptionInput Trace data pin 0.
Pin 16 Signal TRACEDATA[1] TypeInput DescriptionInput Trace data pin 1.
Pin 18 Signal TRACEDATA[2] TypeInput DescriptionInput Trace data pin 2.
Pin 20 Signal TRACEDATA[3] TypeInput DescriptionInput Trace data pin 3.


• Trace and streaming probe
• Real-time streaming of events and system ticks
• Tune your application with live profiling
• Satisfy regulatory requirements with instruction-level code coverage
• Isolate and Identify hard-to-find code defects with unlimited trace
• Supports Streaming Trace
• Supports Cortex-M microcontroller
• Full J-Link debug functionality