EDPIDR2, External Debug Peripheral Identification Register 2
The EDPIDR2 characteristics are:
Provides information to identify an external debug component.
For more information see 'About the Peripheral identification scheme' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile, section H8 (About the External Debug Registers).
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.
EDPIDR2 is a 32-bit register.
The EDPIDR2 bit assignments are:
REVISION, bits [7:4]
Part major revision. Parts can also use this field to extend Part number to 16-bits.
JEDEC, bit 
RAO. Indicates a JEP106 identity code is used.
DES_1, bits [2:0]
Designer, most significant bits of JEP106 ID code. For Arm Limited, this field is 0b011.
Accessing the EDPIDR2
EDPIDR2 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.