CNTV_TVAL, Counter-timer Virtual Timer TimerValue

The CNTV_TVAL characteristics are:

Purpose

Holds the timer value for the virtual timer.

Configuration

The power domain of CNTV_TVAL is IMPLEMENTATION DEFINED.

For more information, see 'Power and reset domains for the system level implementation of the Generic Timer'.

Attributes

CNTV_TVAL is a 32-bit register.

Field descriptions

313029282726252423222120191817161514131211109876543210
TimerValue

TimerValue, bits [31:0]

The TimerValue view of the virtual timer.

On a read of this register:

On a write of this register, CompareValue is set to (CNTVCT + TimerValue), where TimerValue is treated as a signed 32-bit integer.

When CNTV_CTL.ENABLE is 1, the timer condition is met when (CNTVCT - CompareValue) is greater than or equal to zero. This means that TimerValue acts like a 32-bit downcounter timer. When the timer condition is met:

When CNTV_CTL.ENABLE is 0, the timer condition is not met, but CNTVCT continues to count, so the TimerValue view appears to continue to count down.

The reset behaviour of this field is:

Accessing CNTV_TVAL

CNTV_TVAL can be implemented in any implemented CNTBaseN frame that has virtual timer capability, and in the corresponding CNTEL0BaseN frame.

'CNTCTLBase status and control fields for the CNTBaseN and CNTEL0BaseN frames' describes the status fields that identify whether a CNTBaseN frame is implemented, and for an implemented frame:

For an implemented CNTBaseN frame that has virtual timer capability:

For an implemented CNTEL0BaseN frame:

CNTV_TVAL can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
TimerCNTBaseN0x038CNTV_TVAL

Accesses on this interface are RW.

ComponentFrameOffsetInstance
TimerCNTEL0BaseN0x038CNTV_TVAL

Accesses on this interface are RW.


30/06/2021 15:21; 2a17f7750cfd1ab239f20f6cf29877ba8041794f

Copyright © 2010-2021 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.