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The Cross-Trigger Interface (CTI) enables the debug logic, ETM trace unit, and PMU to interact with each other and with other CoreSight components. For example, you configure the CTI to generate an interrupt when the ETM trace unit trigger event occurs.
The single external cross-trigger channel interface of the processor connects to the CTI of each core through a Cross Trigger Matrix (CTM). Trigger inputs and trigger outputs connect debug components in the processor and CoreSight CTI blocks. The external CTM output is driven by the OR of the internal CTI outputs. Each internal CTI input is driven by the OR of the other internal CTI outputs and the external CTM input.