The CNTVCT characteristics are:
Holds the 64-bit virtual count value.
This register is part of the Generic Timer registers functional group.
This register is accessible as follows:
Default |
---|
RO |
CNTVCT can be implemented in any implemented CNTBaseN frame, and in the corresponding CNTEL0BaseN frame, as a RO register.
'CNTCTLBase status and control fields for the CNTBaseN and CNTEL0BaseN frames' in Chapter I1 of the ARMv8 ARM describes the status fields that identify whether a CNTBaseN frame is implemented, and for an implemented frame:
For an implemented CNTBaseN frame:
For an implemented CNTEL0BaseN frame:
If the implementation supports 64-bit atomic accesses, then the CNTVCT register must be accessible as an atomic 64-bit value.
The power domain of CNTVCT is IMPLEMENTATION DEFINED.
For more information see 'Power and reset domains for the system level implementation of the Generic Timer' in Chapter I1 of the ARMv8 ARM.
CNTVCT is a 64-bit register.
The CNTVCT bit assignments are:
63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
Virtual count value | |||||||||||||||||||||||||||||||
Virtual count value | |||||||||||||||||||||||||||||||
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 |
Virtual count value.
CNTVCT[31:0] can be accessed through its memory-mapped interface:
Component | Frame | Offset |
---|---|---|
Timer | CNTBaseN | 0x008 |
Timer | CNTEL0BaseN | 0x008 |
CNTVCT[63:32] can be accessed through its memory-mapped interface:
Component | Frame | Offset |
---|---|---|
Timer | CNTBaseN | 0x00C |
Timer | CNTEL0BaseN | 0x00C |
28/09/2017 08:24
Copyright © 2010-2017 ARM Limited or its affiliates. All rights reserved. This document is Non-Confidential.