The CNTVCT characteristics are:
Holds the 64-bit virtual count 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 Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile.
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 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 CNTVCT register must be accessible as an atomic 64-bit value.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTBaseN | 0x008 | CNTVCT | 31:0 |
Access on this interface is RO.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTBaseN | 0x00C | CNTVCT | 63:32 |
Access on this interface is RO.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTEL0BaseN | 0x008 | CNTVCT | 31:0 |
Access on this interface is RO.
Component | Frame | Offset | Instance | Range |
---|---|---|---|---|
Timer | CNTEL0BaseN | 0x00C | CNTVCT | 63:32 |
Access on this interface is RO.
13/12/2018 16:42; 6379d01c197f1d40720d32d0f84c419c9187c009
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