About the cross trigger
The Cortex-A72 processor has a single external cross trigger channel interface.
This external interface is connected to the CoreSight CTI interface corresponding to each processor through a simplified Cross Trigger Matrix (CTM). A number of Embedded Cross Trigger (ECT), trigger inputs and trigger outputs are connected between debug components in the processor and CoreSight CTI blocks.
The CoreSight Cross Trigger Interface (CTI) enables the debug logic, ETM, and PMU, to interact with each other and with other CoreSight components. This is called cross triggering. For example, you configure the CTI to generate an interrupt when the ETM trigger event occurs.
The following figure shows the debug system components and the available trigger inputs and trigger outputs.
Figure 12-1 Debug system components