s32k314 jtag debug question

[Oido]

Hello, I built a PCB with s32k314. I'm using JTAG, but I got a problem with 1.5V on the TMS pin and couldn't get into the DEBUG.
I brought the JTAG circuit of the EVB board of S32K344.
Isn't it normal for the TMS pin to float 5V with PULL UP?
The TMS pin is connected to the PTA4 of the MCU through the 5V supply line and not to the other pins.

5V turns to 1.5V after R28 only, so I'm baffled. Is it correct that I have to be HIGH on the TMS to enter debug mode?

[lukaszadrapa · Accepted solution]

Hi @Oido 

there must be something wrong, you shouldn't see such voltage on TMS.

Default function on PTA4 is TMS which is input internally pulled up. Isn't there some shortcut on the board?

Regards,

Lukas

[Oido]

Hello, I found the right answer.
The inner pins of the MCU were not soldered.
The problem was that the company that manufactured the PCB did not check it properly.
Thank you.
I'm facing another problem now, can you help me answer other questions?

[lukaszadrapa]

For other questions, please create new thread. There's unwritten rule - one thread, one topic. Then it's easier for us and for customers to search in the history.

Thanks,

Lukas

[Oido]

I see what you mean. Thank you for letting me know. I found out for the first time.