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A.4.3. Authentication interface signal

The authentication interface disables AXI accesses. Table A.19 shows the authentication interface signal. See the ARM® CoreSight™ Architecture Specification for more information.

Table A.19. Authentication Interface signal

Secure privileged non-invasive debug enable. When the spniden signal is high, it enables counting of the Secure events.

You can specify one of the following values:


Do not count Secure events in the performance counters.


Count Secure events in the performance counters.

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