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EDDEVARCH, External Debug Device Architecture register

The EDDEVARCH characteristics are:

Purpose

Identifies the programmers' model architecture of the external debug component.

Configuration

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.

Attributes

EDDEVARCH is a 32-bit register.

Field descriptions

313029282726252423222120191817161514131211109876543210
ARCHITECTPRESENTREVISIONARCHVERARCHPART

ARCHITECT, bits [31:21]

Defines the architecture of the component. For debug, this is Arm Limited.

Bits [31:28] are the JEP106 continuation code, 0x4.

Bits [27:21] are the JEP106 ID code, 0x3B.

Reads as 0b01000111011.

Access to this field is RO.

PRESENT, bit [20]

Indicates that the DEVARCH is present.

Reads as 0b1.

Access to this field is RO.

REVISION, bits [19:16]

Defines the architecture revision. For architectures defined by Arm this is the minor revision.

For debug, the revision defined by Armv8Armv8-A is 0x0.

All other values are reserved.

Reads as 0b0000.

Access to this field is RO.

ARCHVER, bits [15:12]

Architecture Version. Defines the architecture version of the component. DefinedThis valuesis are:the same value asID_AA64DFR0_EL1.DebugVer and DBGDIDR.Version. The defined values of this field are:

ARCHVERMeaning
0b0110

Armv8Armv8.0 debugDebug architecture.

0b0111

Armv8Armv8.0 debugDebug architecture with Virtualization Host Extensions.

0b1000

Armv8.2 debugDebug architecture,architecture. FEAT_Debugv8p2.

0b1001

Armv8.4 debugDebug architecture,architecture. FEAT_Debugv8p4.

0b1010

Armv8.8 debug architecture, FEAT_Debugv8p8.

EDDEVARCH.ARCHVER and EDDEVARCH.ARCHPART are also defined as a single field, EDDEVARCH.ARCHID, so that EDDEVARCH.ARCHVER is EDDEVARCH.ARCHID[15:12].

FEAT_Debugv8p4 adds the functionality indicated by the value 0b1001. FEAT_Debugv8p2 adds the functionality indicated by the value 0b1000. If FEAT_VHE is not implemented, the only permitted value is 0b0110.

FEAT_VHE adds the functionality identified by the value 0b0111.The fields ARCHVER and ARCHPART together form the field ARCHID, so that ARCHVER is ARCHID[15:12].

FEAT_Debugv8p2 adds the functionality identified by the value 0b1000.

FEAT_Debugv8p4 adds the functionality identified by the value 0b1001.

FEAT_Debugv8p8 adds the functionality identified by the value 0b1010.

From Armv8.1, when FEAT_VHE is implemented the value 0b0110 is not permitted.

From Armv8.2, the values 0b0110 and 0b0111 are not permitted.

From Armv8.4, the value 0b1000 is not permitted.

From Armv8.8, the value 0b1001 is not permitted.

ARCHPART, bits [11:0]

ArchitectureThe Part.part Definesnumber of the architectureArmv8-A of thedebug component.

EDDEVARCH.ARCHVERThe andfields EDDEVARCH.ARCHPARTARCHVER areand alsoARCHPART definedtogether asform athe single field, EDDEVARCH.ARCHIDARCHID, so that EDDEVARCH.ARCHPARTARCHPART is EDDEVARCH.ARCHIDARCHID[11:0].

Armv8-A debug architecture.

Reads as 0xA15.

Access to this field is RO.

Accessing EDDEVARCH

EDDEVARCH can be accessed through the external debug interface:

ComponentOffsetInstance
Debug0xFBCEDDEVARCH

This interface is accessible as follows:


3020/09/2021 1412:5337; 092b4e1bbfbb45a293b198f9330c5f529ead2b0fd4a233ffbdfb36e47856c443a7ce9a85f5e501ca

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