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TRCIDR9

TRCIDR9, Trace ID Register 9

The TRCIDR9 characteristics are:

Purpose

Returns the tracing capabilities of the trace unit.

Configuration

External register TRCIDR9 bits [31:0] are architecturally mapped to AArch64 System register TRCIDR9[31:0].

This register is present only when FEAT_ETE is implemented and FEAT_TRC_EXT is implemented. Otherwise, direct accesses to TRCIDR9 are RES0.

Attributes

TRCIDR9 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
NUMP0KEY

NUMP0KEY, bits [31:0]
When TRCIDR0.TRCDATA != '00':

Indicates the number of P0 right-hand keys. Data tracing is not implemented in ETE and this field is reserved for other trace architectures. Allocated in other trace architectures.

This field has an IMPLEMENTATION DEFINED value.

Access to this field is RO.

Otherwise:

Reserved, RES0.

Accessing TRCIDR9

TRCIDR9 can be accessed through the external debug interface:

Component	Offset	Instance
ETE	0x184	TRCIDR9

Accessible as follows:

When OSLockStatus() or !IsTraceCorePowered(), accesses to this register generate an error response.
Otherwise, accesses to this register are RO.

2026-03-26 20:27:25, 2026-03_rel