The CoreSight CTI channel signals from all the cores are combined using a simplified Cross Trigger Matrix (CTM) so that a single cross trigger channel interface is presented in the Cortex-A72 processor.
The CTM can combine up to four internal channel interfaces, corresponding to each core, and one external channel interface.
In the simplified CTM:
- The external channel output is driven by the OR output of all internal channel outputs.
- Each internal channel input is driven by the OR output of the internal channel outputs of all other CTIs, in addition to the external channel input.
The internal channel acknowledgment signals from the CTIs are not used because the CTIs and the CTM are in the same PCLKDBG domain.