SPRZ457H January 2021 – December 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
JTAG: TAP used by Debuggers may be inaccessible if TRSTn device pin is never asserted
If TRSTn is never observed LOW, access to the embedded Debugger scan chains might be blocked by uninitialized logic. JTAG bypass and Boundary Scan functionality is not affected.
Prior to connecting a Debugger, ensure that the TRSTn pin is asserted LOW for 100ns and subsequently de-asserted HIGH at-least one time after device power on.