no old file | htmldiff from- | (new)

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

# TRCCNTVR<n>, Counter Value Register <n>, n = 0 - 3

The TRCCNTVR<n> characteristics are:

## Purpose

This sets or returns the value of counter <n>.

## Configuration

External register TRCCNTVR<n> bits [31:0] are architecturally mapped to AArch64 System register TRCCNTVR<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 TRCCNTVR<n> are RES0.

## Attributes

TRCCNTVR<n> is a 32-bit register.

## Field descriptions

The TRCCNTVR<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 count value of counter.

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

## Accessing the TRCCNTVR<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.

Reads from this register might return an UNKNOWN value if the trace unit is not in either of the Idle or Stable states.

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

Component | Offset
--- | ---
ETE | 0x160 + 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

Copyright © 2010-2019 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.

no old file | htmldiff from- | (new)