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CTIDEVAFF1, CTI Device Affinity register 1

The CTIDEVAFF1 characteristics are:


Copy of the high half of the PE MPIDR_EL1 register that allows a debugger to determine which PE in a multiprocessor system the CTI component relates to.

If the CTI is CTIv1, this register is OPTIONAL. If the CTI is CTIv2, this register is mandatory.

Arm recommends that the CTI is CTIv2.

In an Armv8.5 compliant implementation, the CTI must be CTIv2.

If this register is implemented, then CTIDEVAFF0 must also be implemented. If the CTI of a PE does not implement the CTI Device Affinity registers, the CTI block of the external debug memory map must be located 64KB above the debug registers in the external debug interface.


CTIDEVAFF1 is in the Debug power domain.

Implementation of this register is OPTIONAL.


CTIDEVAFF1 is a 32-bit register.

Field descriptions

The CTIDEVAFF1 bit assignments are:


MPIDR_EL1hi, bits [31:0]

MPIDR_EL1 high half. Read-only copy of the high half of MPIDR_EL1, as seen from the highest implemented Exception level.

Accessing the CTIDEVAFF1

CTIDEVAFF1 can be accessed through the external debug interface:


Accesses on this interface are RO.