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TRCCNTRLDVR<n>, Trace Counter Reload Value Register <n>, n = 0 - 3

The TRCCNTRLDVR<n> characteristics are:

Purpose

This sets or returns the reload count value for Counter <n>.

Configuration

External register TRCCNTRLDVR<n> bits [31:0] are architecturally mapped to AArch64 System register TRCCNTRLDVR<n>[31:0].

This register is present only when FEAT_ETE is implemented, FEAT_TRC_EXT is implemented, and UInt(TRCIDR5.NUMCNTR) > n. Otherwise, direct accesses to TRCCNTRLDVR<n> are RES0.

Attributes

TRCCNTRLDVR<n> is a 32-bit register.

Field descriptions

Bits [31:16]

VALUE, bits [15:0]

Accessing TRCCNTRLDVR<n>

Must be programmed if TRCRSCTLR<a>.GROUP == 0b0010 and TRCRSCTLR<a>.COUNTERS[n] == 1.

Writes are CONSTRAINED UNPREDICTABLE if the trace unit is not in the Idle state.

TRCCNTRLDVR<n> can be accessed through the external debug interface:

Accessible as follows:

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

2026-03-26 20:27:25, 2026-03_rel

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