This is the debug logic reset signals. This signal must be asserted during a power-on reset sequence. Other reset signals, nCPURESET and nNEONRESET, if MPE is present, have no effect on the debug logic.
On a debug reset:
The debug state is unchanged. That is, DBGSCR.HALTED is unchanged.
The processor removes the pending halting debug events DBGDRCR.HaltReq.