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CNTID, Counter Identification Register

The CNTID characteristics are:

Purpose

Indicates whether counter scaling is implemented.

Configuration

The power domain of CNTID is IMPLEMENTATION DEFINED.

This register is present only when ARMv8.4-CNTSC is implemented. Otherwise, direct accesses to CNTID are RES0.

Attributes

CNTID is a 32-bit register.

Field descriptions

The CNTID bit assignments are:

313029282726252423222120191817161514131211109876543210
0000000000000000000000000000CNTSC

Bits [31:4]

Reserved, RES0.

CNTSC, bits [3:0]

Indicates whether Counter Scaling is implemented

CNTSCMeaning
0b0000

Counter scaling is not implemented.

0b0001

Counter scaling is implemented.

All other values are reserved.

Accessing the CNTID

In a system that supports Secure and Non-secure memory maps, the CNTControlBase frame, that includes this register, is implemented only in the Secure memory map.

CNTID can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
TimerCNTControlBase0x1CCNTID

Access on this interface is RO.



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