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EDPIDR3, External Debug Peripheral Identification Register 3

The EDPIDR3 characteristics are:


Provides information to identify an external debug component.

For more information, see 'About the Peripheral identification scheme'.


Implementation of this register is OPTIONAL.

If FEAT_DoPD is implemented, this register is in the Core power domain. If FEAT_DoPD is not implemented, this register is in the Debug power domain.

This register is required for CoreSight compliance.


EDPIDR3 is a 32-bit register.

Field descriptions

The EDPIDR3 bit assignments are:


Bits [31:8]

Reserved, RES0.

REVAND, bits [7:4]

Part minor revision. Parts using EDPIDR2.REVISION as an extension to the Part number must use this field as a major revision number.

CMOD, bits [3:0]

Customer modified. Indicates someone other than the Designer has modified the component.

Accessing the EDPIDR3

EDPIDR3 can be accessed through the external debug interface:


This interface is accessible as follows:

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