J-Trace PRO for Cortex-M—The Leading Trace Probe

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.

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 [More..]
Supports Cortex-M microcontroller [More..]
Full J-Link debug functionality [More..]

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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).

Specifications

Specification	Value
Supported OS	Microsoft Windows (x86 / x64 / Arm64), Linux (x86 / x64 / Arm / Arm64), macOS (x64 / 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
Mechanical
Size (without cables)	123mm x 68mm x 30mm
Weight (without cables)	(without cables) 120g
Available Interfaces
Ethernet interface	Gigabit
USB interface	USB 3.0, SuperSpeed
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 (V_IF)	1.2V ... 5V
LOW level input voltage (V_IL)	V_IL <= 40% of V_IF
HIGH level input voltage (V_IH)	V_IH >= 60% of V_IF
JTAG/SWD Interface, Timing
Data input rise time (T_rdi)	Max. 20ns
Data input fall time (T_fdi)	Max. 20ns
Data output rise time (T_rdo)	Max. 10ns
Data output fall time (T_fdo)	Max. 10ns
Clock rise time (T_rc)	Max. 10ns
Clock fall time (T_fc)	Max. 10ns
Trace Interface, Electrical
Power supply	USB powered (max. 400mA)
Target interface voltage (V_IF)	1.2V ... 5V
Voltage interface low pulse (V_IL)	Max. 40% of V_IF
Voltage interface high pulse (V_IH)	Min. 60% of V_IF
Trace Interface
Max. trace clock frequency	150 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.

	Signal	Type	Description
Pin 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.
Pin 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.
Pin 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.
Pin 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.
Pin 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.
Pin 9	NC	NC	Not connected inside J-Link. Leave open on target hardware.
Pin 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".
Pin 11	5V-Supply	Output	This pins can be used to supply power to the target hardware.
Pin 12	TRACECLK	Input	Input trace clock. Trace clock = 1/2 CPU clock.
Pin 13	5V-Supply	Output	This pins can be used to supply power to the target hardware.
Pin 14	TRACEDATA[0]	Input	Input Trace data pin 0.
Pin 16	TRACEDATA[1]	Input	Input Trace data pin 1.
Pin 18	TRACEDATA[2]	Input	Input Trace data pin 2.
Pin 20	TRACEDATA[3]	Input	Input Trace data pin 3.