CNTID, Counter Identification Register

The CNTID characteristics are:

Purpose

Indicates whether counter scaling is implemented.

Configuration

It is IMPLEMENTATION DEFINED whether CNTID is implemented in the Core power domain or in the Debug power domain.

This register is present only when FEAT_CNTSC is implemented. Otherwise, direct accesses to CNTID are RES0.

Attributes

CNTID is a 32-bit register.

Field descriptions

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
RES0																												CNTSC

Bits [31:4]

Reserved, RES0.

CNTSC, bits [3:0]

Indicates whether Counter Scaling is implemented.

The value of this field is an IMPLEMENTATION DEFINED choice of:

CNTSC	Meaning
0b0000	Counter scaling is not implemented.
0b0001	Counter scaling is implemented.

All other values are reserved.

Access to this field is RO.

Accessing CNTID

In a system that supports the Realm Management Extension, the CNTControlBase frame, which includes this register, is implemented only in the Root physical address space.

In a system that supports Secure and Non-secure physical address spaces, the CNTControlBase frame, which includes this register, is implemented only in the Secure physical address space.

CNTID can be accessed through the memory-mapped interfaces:

Component	Frame	Offset	Instance
Timer	CNTControlBase	0x1C	CNTID

Accesses on this interface are RO.

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6