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. RW fields in this register reset to architecturally UNKNOWN values. These apply only on a reset of the reset domain in which the register is implemented. The register is not affected by a reset of any other reset domain.

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

The CNTV_TVAL bit assignments are:

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.

This field resets to an architecturally UNKNOWN value.

Accessing the 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.




12/01/2022 09:56; 05a4944b4b04e7ab50def8c126b479d22136f35b

Copyright © 2010-2022 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.