Clarity on CMPMATCH event

The ARMv7-M architecture reference manual refers to the generation of CMPMATCH[N] events, from the DWT to the ETM (e.g. on matching a PC or data value).

I can't find anywhere how the CMPMATCH event can be used by the ETM; there is no mention in the ETM architecture spec.

How do I enable tracing from a CMPMATCH event? Target is M3, DesignStart Xilinx FPGA.

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