Trace Reference Boards

The 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 or later. A table with currently available boards can be found below.

Key features

  • Perfect for quick and simple trace setups
  • Small footprint for optimal portability
  • Numerous target devices to choose from
  • Can be powered through the J-Trace PRO, no additional cabling required
  • 3 LEDs implemented for flexible use in trace demo applications
  • All trace signals available as test points for easy measurement setups with oscilloscopes

Trace Reference Board models

Cortex - M Trace Ref Board
IMX RT1050 Trace Ref Board
STM32H7 Trace Ref Board
BoardCortex-M Trace Reference BoardiMX RT1050 Trace Reference BoardSTM32H7 Trace Reference Board
Target DeviceST STM32F407NXP iMX RT1051/52ST STM32H743
Max. CPU clock speed168 MHz600 MHz400 MHz
Max. trace bandwidth672 Mbps with 4-bit Trace,
168 MHz Trace port clock*
1056 Mbps with 4-bit Trace,
264 MHz Trace port clock*
1064 Mbps with 4-bit Trace,
266 MHz Trace port clock*
Debug interfaceJTAG / SWD / SWOSWDJTAG / SWD / SWO

* Actual Trace clock is half the TPIU frequency as “half rate clocking”, dual data rate is used, with sampling on both rising and falling edges.

Target connector

The following pictures show the target side pinout of the Trace Reference Board when used with SWD or JTAG respectively:

Pin 1VTrefOutputThis is the target reference voltage. It is used by J-Link 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 2SWDIO/ TMSI/O / InputJTAG mode set input of target CPU. This pin should be pulled up on the target. Typically connected to TMS of the target CPU.
Pin 4SWCLK/ TCKInputJTAG 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 6SWO / TDOOutputJTAG 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 8TDIInputJTAG 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 9NCNCNot connected inside J-Link. Leave open on target hardware.
Pin 10nRESETI/OTarget CPU reset signal. Typically connected to the RESET pin of the target CPU, which is typically called “nRST”, “nRESET” or “RESET”.
Pin 12TRACECLKOutputOutputs trace clock. Trace clock = 1/2 CPU clock for Cortex-M devices.
Pin 14TRACEDATA[0]OutputOutput Trace data pin 0.
Pin 16TRACEDATA[1]OutputOutput Trace data pin 1.
Pin 18TRACEDATA[2]OutputOutput Trace data pin 2.
Pin 20TRACEDATA[3]OutputOutput Trace data pin 3.
Target Side Pinout

Pins 3, 5, 15, 17, 19 are GND pins connected to GND.

Preparing J-Trace PRO to supply power

J-Trace PRO is able to supply 5V power to the target side on pin 11 and pin 13. In order to do this, you may have to configure J-Trace PRO once as follows:

  • Make sure that SEGGER J-Link software is installed on your machine.
  • Start J-Link Commander (JLink.exe), which can be found under “Start -> Programs -> SEGGER ->”
  • Enter the following command: power on perm
  • Connect the Trace Reference Board to J-Trace

The green LED on J-Trace PRO labeled “Target power” should light up now.

Using the Trace Reference Boards with another Arm emulator

The Trace Reference Boards have been designed for J-Trace Pro, but can also be used with other Arm emulators with the same pin-out. Do this at your own risk!