4.8.3. ECT authentication signals

Table 4.32 shows the required authentication signals.

Table 4.32. ECT authentication signals

SignalIn/outDescription
DBGENInputDebug enable signal to mask trigger outputs from a CTI.
NIDENInputNon-invasive debug enable input to mask the trigger inputs that are not connected to a trace or debug device.
TINIDENSELx[7:0]InputSelect to enable individual trigger inputs to be masked when NIDEN is LOW. Each bit of TINIDENSELx[7:0] must be set HIGH to bypass NIDEN, or LOW to be masked by NIDEN.
TODBGENSELx[7:0]InputSelect to enable individual trigger outputs to be masked when DBGEN is LOW. Each bit of TODBGENSELx[7:0] must be set HIGH to bypass DBGEN, or LOW to be masked by DBGEN.

If NIDEN is LOW and TINIDENSELx is LOW, then any read of the CTI Trigger In Status Register returns the corresponding bit LOW. This applies to both Normal operation mode and Integration test mode. If the CTI is configured to generate trigger acknowledgements this must be maintained in normal mode, irrespective of the state of NIDEN.

If DBGEN is LOW and TODBGENSELx is LOW, then any read of the CTI Trigger Out Status Register register returns the corresponding bit LOW. The CTTRIGOUTx register is also LOW. This applies to normal operation mode. In Integration test mode all writes to the ITTRIGOUT Register are ignored. The CTTRIGOUTx register is LOW.

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