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J-Trace PRO for Cortex-M

J-Trace PRO for Cortex-M is setting a new standard for trace probes. It enables continuous streaming trace via its Gigabit Ethernet interface, lifting the limitations by internal buffers and slow data transmission.

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 of 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).


  • Supports Streaming Trace (trace data is streamed to PC/debugger in real time, unlimited trace buffer)
  • Compatible to J-Link (same software utilities can be used)
  • Gigabit Ethernet interface
  • Hi-Speed-USB 2.0 interface (480 MBit/s)
  • JTAG speed: 50 MHz
  • Works with all currently available Cortex-M devices up to 150 MHz ETM trace clock (300 MHz CPU clock)
  • Supports Cortex-M0/M0+/M1/M3/M4/M7 targets
  • Supports ARM's Embedded Trace Macrocell (ETM)
  • Supports ARM's Embedded Trace Buffer (ETB)
  • Supports ARM's Micro Trace Buffer (MTB)
  • Free software updates 1, two years of support
  • 64 MB on-board trace buffer for legacy one-shot tracing mode



PDF Documentation download
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Package content

J-Trace PRO for Cortex-M is delivered with the following components:


Product Demonstration Videos

Up and running within 15 Minutes
Up and running within 15 Minutes
J-Trace PRO Tracing with Ozone
J-Trace PRO Tracing with Ozone


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 an 1-1 cable. The following table lists the J-Link / J-Trace SWD pinout.


Pin Signal Type Description
1 VTref Input 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.
2 SWDIO/ TMS I/O / output JTAG mode set input of target CPU. This pin should be pulled up on the target. Typically connected to TMS of the target CPU.
4 SWCLK/TCK Output JTAG 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.
6 SWO / TDO Input JTAG data output from target CPU. Typically connected to TDO of the target CPU.
--- --- --- This pin (normally pin 7) is not existent on the 19-pin JTAG/SWD and Trace connector.
8 TDI Output JTAG 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.
9 NC NC Not connected inside J-Link. Leave open on target hardware.
10 nRESET I/O Target CPU reset signal. Typically connected to the RESET pin of the target CPU, which is typically called "nRST", "nRESET" or "RESET".
12 TRACECLK Input Input trace clock. Trace clock = 1/2 CPU clock.
14 TRACEDATA[0] Input Input Trace data pin 0.
16 TRACEDATA[1] Input Input Trace data pin 1.
18 TRACEDATA[2] Input Input Trace data pin 2.
20 TRACEDATA[3] Input Input Trace data pin 3.


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
Microsoft Windows 7
Microsoft Windows 7 x64
Microsoft Windows 8
Microsoft Windows 8 x64
Microsoft Windows 10
Microsoft Windows 10 x64
Mac OSX 10.5 and higher
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) 120g
Available Interfaces
Ethernet interface Gigabit
USB interface USB 2.0, Hi-Speed
Target interface JTAG/SWD 20-pin (14-pin adapter available)
JTAG/SWD + Trace 19-pin
JTAG/SWD Interface, Electrical
Power supply USB powered (max. 400mA)
Target interface voltage (VIF) 1.2V ... 5V
LOW level input voltage (VIL) Max. 40% of VIF
HIGH level input voltage (VIH) Min. 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 supply USB 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, Timing
TRACECLK low pulse width (Twl) Min. 2ns
TRACECLK high pulse width (Twh) Min. 2ns
Data rise time (Trd) Max. 3ns
Data fall time (Tfd) Max. 3ns
Clock rise time (Trc) Max. 3ns
Clock fall time (Tfc) Max. 3ns


1As a legitimate owner of a SEGGER J-Trace, you can always download the latest software free of charge. Though not planned and not likely, we reserve the right to change this policy. Note that older models may not be supported by newer versions of the software. Typically, we support older models with new software at least 3 years after end of life.