TRCSEQRSTEVR, Trace Sequencer Reset Control Register

The TRCSEQRSTEVR characteristics are:

Purpose

Moves the Sequencer to state 0 when a programmed resource event occurs.

Configuration

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

This register is present only when FEAT_ETE is implemented, FEAT_TRC_EXT is implemented, and TRCIDR5.NUMSEQSTATE != 0b000. Otherwise, direct accesses to TRCSEQRSTEVR are RES0.

Attributes

TRCSEQRSTEVR 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																								RST_TYPE	RES0		RST_SEL

Bits [31:8]

Reserved, RES0.

RST_TYPE, bit [7]

Reset field. Selects an event that causes the Sequencer to move to state 0.

Chooses the type of Resource Selector.

RST_TYPE	Meaning
0b0	A single Resource Selector. TRCSEQRSTEVR.RST.SEL[4:0] selects the single Resource Selector, from 0-31, used to activate the resource event.
0b1	A Boolean-combined pair of Resource Selectors. TRCSEQRSTEVR.RST.SEL[3:0] selects the Resource Selector pair, from 0-15, that has a Boolean function that is applied to it whose output is used to activate the resource event. TRCSEQRSTEVR.RST.SEL[4] is RES0.

RST_TYPE

Meaning

0b0

A single Resource Selector.

TRCSEQRSTEVR.RST.SEL[4:0] selects the single Resource Selector, from 0-31, used to activate the resource event.

0b1

A Boolean-combined pair of Resource Selectors.

TRCSEQRSTEVR.RST.SEL[3:0] selects the Resource Selector pair, from 0-15, that has a Boolean function that is applied to it whose output is used to activate the resource event. TRCSEQRSTEVR.RST.SEL[4] is RES0.

The reset behavior of this field is:

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

Bits [6:5]

Reserved, RES0.

RST_SEL, bits [4:0]

Reset field. Selects an event that causes the Sequencer to move to state 0.

Defines the selected Resource Selector or pair of Resource Selectors. TRCSEQRSTEVR.RST.TYPE controls whether TRCSEQRSTEVR.RST.SEL is the index of a single Resource Selector, or the index of a pair of Resource Selectors.

If an unimplemented Resource Selector is selected using this field, the behavior of the resource event is UNPREDICTABLE, and the resource event might fire or might not fire when the resources are not in the Paused state.

If an unimplemented Resource Selector is selected using this field, the value returned on a direct read of this field is UNKNOWN.

Selecting Resource Selector pair 0 using this field is UNPREDICTABLE, and the resource event might fire or might not fire when the resources are not in the Paused state.

The reset behavior of this field is:

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

Accessing TRCSEQRSTEVR

Must be programmed if TRCRSCTLR<a>.GROUP == 0b0010 and TRCRSCTLR<a>.SEQUENCER != 0b0000.

Writes are CONSTRAINED UNPREDICTABLE if the trace unit is not in the Idle state.

TRCSEQRSTEVR can be accessed through the external debug interface:

Component	Offset	Instance
ETE	0x118	TRCSEQRSTEVR

Accessible as follows:

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

15/12/2024 22:27; 5e0a212688c6bd7aee92394b6f5e491b4d0fee1d