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PMCIDR2, Performance Monitors Component Identification Register 2

The PMCIDR2 characteristics are:


Provides information to identify a Performance Monitor component.

For more information see 'About the Component identification scheme' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile, section H8 (About the External Debug Registers).


It is IMPLEMENTATION DEFINED whether PMCIDR2 is implemented in the Core power domain or in the Debug power domain.

Implementation of this register is OPTIONAL.

If ARMv8.3-DoPD is implemented, this register is in the Core power domain. If ARMv8.3-DoPD is not implemented, this register is in the Debug power domain.

This register is required for CoreSight compliance.


PMCIDR2 is a 32-bit register.

Field descriptions

The PMCIDR2 bit assignments are:


Bits [31:8]

Reserved, RES0.

PRMBL_2, bits [7:0]

Preamble. Must read as 0x05.

Accessing the PMCIDR2

PMCIDR2 can be accessed through the external debug interface:


This interface is accessible as follows:

  • When ARMv8.3-DoPD is not implemented or IsCorePowered() accesses to this register are RO.
  • Otherwise accesses to this register generate an error response.

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