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TRCSEQEVR<n>, Sequencer State Transition Control Register <n>, n = 0 - 2

The TRCSEQEVR<n> characteristics are:

Purpose

Moves the sequencer state:

  • Backwards, from state n+1 to state n when a programmed resource event occurs.
  • Forwards, from state n to state n+1 when a programmed resource event occurs.

Configuration

External register TRCSEQEVR<n> bits [31:0] are architecturally mapped to AArch64 System register TRCSEQEVR<n>[31:0] .

RW fields in this register reset to architecturally UNKNOWN values.

This register is present only when ETE is implemented and TRCIDR5.NUMSEQSTATE != 0b000. Otherwise, direct accesses to TRCSEQEVR<n> are RES0.

Attributes

TRCSEQEVR<n> is a 32-bit register.

Field descriptions

The TRCSEQEVR<n> bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0B_TYPERES0B_SELF_TYPERES0F_SEL

Bits [31:16]

Reserved, RES0.

B_TYPE, bit [15]

Chooses the type of Resource Selector.

Backward field. Defines whether the backward resource event is a single Resource Selector or a Resource Selector pair. When the resource event occurs then the sequencer state moves from state n+1 to state n. For example, if TRCSEQEVR2.B.SEL == 0x14 then when event 0x14 occurs, the sequencer moves from state 3 to state 2.

B_TYPEMeaning
0b0

A single Resource Selector.

TRCSEQEVR<n>.B.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.

TRCSEQEVR<n>.B.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. TRCSEQEVR<n>.B.SEL[4] is RES0.

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

Bits [14:13]

Reserved, RES0.

B_SEL, bits [12:8]

Defines the selected Resource Selector or pair of Resource Selectors. TRCSEQEVR<n>.B.TYPE controls whether TRCSEQEVR<n>.B.SEL is the index of a single Resource Selector, or the index of a pair of Resource Selectors.

Backward field. Selects the single Resource Selector or Resource Selector pair.

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.

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

F_TYPE, bit [7]

Chooses the type of Resource Selector.

Backward field. Defines whether the forward resource event is a single Resource Selector or a Resource Selector pair. When the resource event occurs then the sequencer state moves from state n to state n+1. For example, if TRCSEQEVR1.F.SEL == 0x12 then when event 0x12 occurs, the sequencer moves from state 1 to state 2.

F_TYPEMeaning
0b0

A single Resource Selector.

TRCSEQEVR<n>.F.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.

TRCSEQEVR<n>.F.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. TRCSEQEVR<n>.F.SEL[4] is RES0.

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

Bits [6:5]

Reserved, RES0.

F_SEL, bits [4:0]

Defines the selected Resource Selector or pair of Resource Selectors. TRCSEQEVR<n>.F.TYPE controls whether TRCSEQEVR<n>.F.SEL is the index of a single Resource Selector, or the index of a pair of Resource Selectors.

Forward field. Selects the single Resource Selector or Resource Selector pair.

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.

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

Accessing the TRCSEQEVR<n>

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.

TRCSEQEVR<n> can be accessed through the external debug interface:

ComponentOffset
ETE0x100 + 4n

This interface is accessible as follows:

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


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