The CNTPCT characteristics are:
Holds the 64-bit physical count value.
The power domain of CNTPCT 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 Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile.
CNTPCT is a 64-bit register.
The CNTPCT 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 |
Physical count value | |||||||||||||||||||||||||||||||
Physical 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 |
Physical count value.
CNTPCT 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 Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile 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 CNTPCT register must be accessible as an atomic 64-bit value.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTBaseN | 0x000 | CNTPCT | 31:0 |
Access on this interface is RO.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTBaseN | 0x004 | CNTPCT | 63:32 |
Access on this interface is RO.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTEL0BaseN | 0x000 | CNTPCT | 31:0 |
Access on this interface is RO.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTEL0BaseN | 0x004 | CNTPCT | 63:32 |
Access on this interface is RO.
13/12/2018 16:42; 6379d01c197f1d40720d32d0f84c419c9187c009
Copyright © 2010-2018 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.