Quote from SEGGER - Alex: “Well, it is marked as an I/O because it is an I/O.
J-Link can drive it LOW and J-Link can release it and read the pin level.
The pin is open drain.
Input makes sense because there may be a reset button on the target HW that…
In the J-Link user guide, the nRESET is listed as an I/O.
I am just not clear what it means by I/O. I believe it is an output from the segger? Why is it listed as I/O?
Furthermore, is this signal open drain or driven high?