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The ETM-M33 contains integration test registers. These can be used to access some of the ports that are useful in determining the system level trace topology by identifying the integration between specific components. Because the integration mode overrides the normal bus protocols, the ETM and ATB interconnect must be reset when any topology detection has been performed. Integration test registers are used to set the outputs and read the state of some of the signals.
To access the integration test registers, you must first set bit of the B1.29.4 Integration Mode Control Register to 1.
Table B1-42 Output signals that the integration test registers can control
Table B1-43 Input signals that the integration test registers can read
See the ARM® Embedded Trace Macrocell Architecture Specification ETMv4 for more information about TRCITCTRL.