How to connect JTAG nTRST when using 19-pin trace header

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The 19-pin JTAG/SWD and Trace connector does not have the JTAG nTRST signal defined as it is not specified by Arm. However if your target device has such a pin it must be pulled high, otherwise the debug logic may be reset unintentionally. Our recommendation when using the 19-pin header is to either connect that signal to pin 1 (VTref) of the J-Link/J-Trace or pull it high on the target side without connection to the debug probe.

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