TRBITCTRL, Integration Mode Control Register

The TRBITCTRL characteristics are:

Purpose

A component can use TRBITCTRL to dynamically switch between functional mode and integration mode. In integration mode, topology detection is enabled. After switching to integration mode and performing integration tests or topology detection, reset the system to ensure correct behavior of CoreSight and other connected system components.

For additional information, see the CoreSight Architecture Specification.

Configuration

TRBITCTRL is in the Core power domain.

This register is present only when FEAT_TRBE_EXT is implemented. Otherwise, direct accesses to TRBITCTRL are RES0.

Attributes

TRBITCTRL 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																															IME

Bits [31:1]

Reserved, RES0.

IME, bit [0]
When topology detection or integration functionality is implemented:

Integration Mode Enable.

IME	Meaning
0b0	Component functional mode.
0b1	Component integration mode. Support for topology detection and integration testing is enabled.

The reset behavior of this field is:

On a Warm reset, this field resets to an architecturally UNKNOWN value.

Otherwise:

Reserved, RES0.

Accessing TRBITCTRL

The PE might ignore a write to TRBITCTRL if any of the following apply:

TRBLIMITR_EL1.E == 1, and either FEAT_TRBE_EXT is not implemented or the Trace Buffer Unit is using Self-hosted mode.
TRBLIMITR_EL1.XE == 1, FEAT_TRBE_EXT is implemented, and the Trace Buffer Unit is using External mode.

TRBITCTRL can be accessed through the external debug interface:

Component	Offset	Instance
TRBE	0xF00	TRBITCTRL

Accessible as follows:

When DoubleLockStatus(), or !IsCorePowered(), or OSLockStatus(), or !AllowExternalTraceBufferAccess(), accesses to this register generate an error response.
Otherwise, accesses to this register are RW.

21/03/2025 17:53; 154105dd5041532b480d9ef0c018b8420cbe5c19