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TRCCLAIMSET, Claim Tag Set Register

The TRCCLAIMSET characteristics are:


In conjunction with TRCCLAIMCLR, provides Claim Tag bits that can be separately set and cleared to indicate whether functionality is in use by a debug agent.

For additional information see the CoreSight Architecture Specification.


External register TRCCLAIMSET bits [31:0] are architecturally mapped to AArch64 System register TRCCLAIMSET[31:0] .

This register is present only when ETE is implemented. Otherwise, direct accesses to TRCCLAIMSET are RES0.

The number of claim tag bits implemented is IMPLEMENTATION DEFINED. Arm recommends that implementations support a minimum of four claim tag bits, that is, SET[3:0] reads as 0b1111.


TRCCLAIMSET is a 32-bit register.

Field descriptions

The TRCCLAIMSET bit assignments are:

SET<m>, bit [m]

SET<m>, bit [m], for m = 0 to 31

Claim Tag Set. Indicates whether Claim Tag bit m is implemented, and is used to set Claim Tag bit m to 0b1.


On a read: Claim Tag bit m is not implemented.

On a write: Ignored.


On a read: Claim Tag bit m is implemented.

On a write: Set Claim Tag bit m to 0b1.

Accessing the TRCCLAIMSET

TRCCLAIMSET can be accessed through the external debug interface:


This interface is accessible as follows:

  • When OSLockStatus() or !IsTraceCorePowered() accesses to this register generate an error response.
  • Otherwise accesses to this register are RW.