TRCTSCTLR, Timestamp Control Register

The TRCTSCTLR characteristics are:

Purpose

Controls the insertion of global timestamps in the trace stream.

Configuration

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

This register is present only when FEAT_ETE is implemented, FEAT_TRC_EXT is implemented and TRCIDR0.TSSIZE != 0b00000. Otherwise, direct accesses to TRCTSCTLR are RES0.

Attributes

TRCTSCTLR 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																								EVENT_TYPE	RES0		EVENT_SEL

Bits [31:8]

Reserved, RES0.

EVENT_TYPE, bit [7]
When TRCIDR4.NUMRSPAIR != 0b0000:

Chooses the type of Resource Selector.

EVENT_TYPE	Meaning
0b0	A single Resource Selector. TRCTSCTLR.EVENT.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. TRCTSCTLR.EVENT.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. TRCTSCTLR.EVENT.SEL[4] is RES0.

EVENT_TYPE

Meaning

0b0

A single Resource Selector.

TRCTSCTLR.EVENT.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.

TRCTSCTLR.EVENT.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. TRCTSCTLR.EVENT.SEL[4] is RES0.

The reset behavior of this field is:

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

Otherwise:

Reserved, RES0.

Bits [6:5]

Reserved, RES0.

EVENT_SEL, bits [4:0]
When TRCIDR4.NUMRSPAIR != 0b0000:

Defines the selected Resource Selector or pair of Resource Selectors. TRCTSCTLR.EVENT.TYPE controls whether TRCTSCTLR.EVENT.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.

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.

Otherwise:

Reserved, RES0.

Accessing TRCTSCTLR

Must be programmed if TRCCONFIGR.TS == 1.

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

TRCTSCTLR can be accessed through the external debug interface:

Component	Offset	Instance
ETE	0x030	TRCTSCTLR

This interface is accessible as follows:

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

04/07/2023 11:27; 1b994cb0b8c6d1ae5a9a15edbc8bd6ce3b5c7d68

TRCTSCTLR, Timestamp Control Register

Purpose

Configuration

Attributes

Field descriptions

Bits [31:8]

EVENT_TYPE, bit [7]When TRCIDR4.NUMRSPAIR != 0b0000:

Otherwise:

Bits [6:5]

EVENT_SEL, bits [4:0]When TRCIDR4.NUMRSPAIR != 0b0000:

Otherwise:

Accessing TRCTSCTLR

TRCTSCTLR can be accessed through the external debug interface:

EVENT_TYPE, bit [7]
When TRCIDR4.NUMRSPAIR != 0b0000:

EVENT_SEL, bits [4:0]
When TRCIDR4.NUMRSPAIR != 0b0000: