How should the JTAG connector signals nSRST and nTRST be used?
For reliable debugging over JTAG, the JTAG connector's nSRST signal should only reset the ARM core and not the JTAG state machine / EmbeddedICE logic. If this is not the case, the debugger will be unable to reset and stop the processor without allowing the program currently in memory to execute for a period of time. This may cause unreliability because the processor and peripherals may not be in their reset state or invalid code may have been executed before a new program can be downloaded or run.
CrossStudio does not use the nTRST signal.