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EDACR, External Debug Auxiliary Control Register

The EDACR characteristics are:

Purpose

Allows implementations to support IMPLEMENTATION DEFINED controls.

Configuration

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

If ARMv8.3-DoPD is implemented, this register is implemented in the Core power domain.

If ARMv8.3-DoPD is not implemented, the power domain that this register is implemented in is IMPLEMENTATION DEFINED.

Changing this register from its reset value causes IMPLEMENTATION DEFINED behavior, including possible deviation from the architecturally-defined behavior.

If the EDACR contains any control bits that must be preserved over power down, then these bits must be accessible by the external debug interface when the OS Lock is locked, OSLSR_EL1.OSLK == 1, and when the Core is powered off.

Attributes

EDACR is a 32-bit register.

Field descriptions

The EDACR bit assignments are:

313029282726252423222120191817161514131211109876543210
IMPLEMENTATION DEFINED

IMPLEMENTATION DEFINED, bits [31:0]

IMPLEMENTATION DEFINED.

The following resets apply:

  • If the register is implemented in the Core power domain:

    • On a Cold reset, this field resets to an architecturally UNKNOWN value.

    • On an External debug reset, the value of this field is unchanged.

    • On a Warm reset, the value of this field is unchanged.

  • If the register is implemented in the External debug power domain:

    • On a Cold reset, the value of this field is unchanged.

    • On an External debug reset, this field resets to an architecturally UNKNOWN value.

    • On a Warm reset, the value of this field is unchanged.

Accessing the EDACR

EDACR can be accessed through the external debug interface:

ComponentOffsetInstance
Debug0x094EDACR

This interface is accessible as follows:

  • When IsCorePowered(), !DoubleLockStatus(), !OSLockStatus() and SoftwareLockStatus() accesses to this register are RO.
  • When IsCorePowered(), !DoubleLockStatus(), !OSLockStatus() and !SoftwareLockStatus() accesses to this register are RW.
  • Otherwise accesses to this register are IMPDEF.