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AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

# TRCCNTRLDVR<n>, 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] .

RW fields in this register reset to architecturally UNKNOWN values.

This register is present only when TRCIDR5.NUMCNTR > n and ETE is implemented. Otherwise, direct accesses to TRCCNTRLDVR<n> are RES0.

## Attributes

TRCCNTRLDVR<n> is a 32-bit register.

## Field descriptions

The TRCCNTRLDVR<n> bit assignments are:

31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
RES0 | VALUE

#### Bits [31:16]

Reserved, RES0.

#### VALUE, bits [15:0]

Contains the reload value for counter <n>. When a reload event occurs for counter <n> then the trace unit copies the VALUE<n> field into counter <n>.

On a Trace unit reset, this field resets to an architecturally UNKNOWN value.

## Accessing the TRCCNTRLDVR<n>

Must be programmed if TRCRSCTLR<a>.GROUP == 0b0010 and TRCRSCTLR<a>.COUNTERS[n] == 0b1.

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

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

Component | Offset
--- | ---
ETE | 0x140 + 4n

This interface is accessible as follows:

- When OSLockStatus(), or !AllowExternalTraceAccess() or !IsTraceCorePowered() access to this register returns an Error.
- Otherwise access to this register is RW.

AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

15/04/2019 16:47; 8c23526ba8a13a72aada4137daf3e3977b49036e

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