13.4. Cortex-A15 CTM

The CoreSight CTI channel signals from all the processors are combined using a simplified Cross Trigger Matrix (CTM) block so that a single cross trigger channel interface is presented in the Cortex-A15 multiprocessor. This module can combine up to four internal channel interfaces corresponding to each processor along with one external channel interface.

In the simplified CTM, 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 internal channel outputs of all other CTIs in addition to the external channel input. The internal channel acknowledgement signals from the CTIs are not used because all the CTIs and the CTM are in the same PCLKDBG domain.

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