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The asicctrl output of the CTI can be used to control multiplexing on a CTI event input if necessary.
The exact configuration of any external multiplexing is user-defined. Arm does not define any relationship between values that are written to the control register and the actual configuration of the multiplexers.
The system integrator sets the EXT_MUX_NUM parameter to indicate the configuration of any external multiplexers. Arm does not specify the usage of the EXT_MUX_NUM parameter. See your system integrator for details of the implementation of your specific SoC.