Nucleo-H7S3L8 MIPI20 to J-Link

C24 · ‎2025-09-13

Hello Everyone,

I have the Nucleo-H7S3L8 as my first STM32 board.

I want to connect it to a Segger J-Link Pro for JTAG. In the official documentation (https://www.st.com/resource/en/user_manual/um3276-stm32h7rx7sx-nucleo144-board-mb1737-stmicroelectronics.pdf), the board supports JTAG debugging through the MIPI20 connector CN1 (7.3.3 on page 14). For a more detailed view, see Figure 4 on Page 10.

I am looking for a way to connect MIPI20 (male pins) to the ARM-20 pins on the J-Link. Is there a way to connect the two?

KDJEM.1 · ‎2025-10-08

Hello @C24 and welcome to the community;

To connect the MIPI20 male pins on the Nucleo-H7S3L8 board to the ARM-20 pins on a Segger J-Link for JTAG debugging, you can use specific adapters or cables. To choice the adequate cable you need to refer to the Segger J-Link documentation for the ARM-20 pinout.

Thank you.

Kaouthar

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Andrew Neil · ‎2025-10-08

@C24 wrote:
I am looking for a way to connect MIPI20 (male pins) to the ARM-20 pins on the J-Link. Is there a way to connect the two?

It's just a pin header - you can check details in the BoM.

You just need to wire the necessary pins from that header to the corresponding pins on the J-Link.

Nothing special required.

You should also find that the necessary debug pins (SWDIO,SWCLK,NRST) are available on the "Morpho headers" - so you could wire to them...

You could ask Segger if they have a suitable adaptor...

https://www.segger.com/support/technical-support/

https://forum.segger.com/board/4-j-link-flasher-related/

PS:

It looks to be compatible with the Standard ARM Cortex Debug+ETM pinout:

https://documentation-service.arm.com/static/5fce6c49e167456a35b36af1#page=2