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TRCSSCCR<n>, Single-shot Comparator Control Register <n>, n = 0 - 7

The TRCSSCCR<n> characteristics are:

Purpose

Controls the corresponding Single-shot Comparator Control resource.

Configuration

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

RW fields in this register reset to architecturally UNKNOWN values.

This register is present only when ETE is implemented and TRCIDR4.NUMSSCC > n. Otherwise, direct accesses to TRCSSCCR<n> are RES0.

Attributes

TRCSSCCR<n> is a 32-bit register.

Field descriptions

The TRCSSCCR<n> bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0RSTARC<m>, bit [m+16] SAC<m>, bit [m]

Bits [31:25]

Reserved, RES0.

RST, bit [24]

Selects the Single-shot Comparator Control mode.

RSTMeaning
0b0

The Single-shot Comparator Control is in single-shot mode.

0b1

The Single-shot Comparator Control is in multi-shot mode.

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

ARC<m>, bit [m+16], for m = 0 to 7

Selects one or more Address Range Comparators for Single-shot control.

ARC<m>Meaning
0b0

The Address Range Comparator m, is not selected for Single-shot control.

0b1

The Address Range Comparator m, is selected for Single-shot control.

This bit is RES0 if m >= TRCIDR4.NUMACPAIRS.

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

SAC<m>, bit [m], for m = 0 to 15

Selects one or more Single Address Comparators for Single-shot control.

SAC<m>Meaning
0b0

The Single Address Comparator m, is not selected for Single-shot control.

0b1

The Single Address Comparator m, is selected for Single-shot control.

This bit is RES0 if m >= 2 × TRCIDR4.NUMACPAIRS.

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

Accessing the TRCSSCCR<n>

Must be programmed if any TRCRSCTLR<a>.GROUP == 0b0011 and TRCRSCTLR<a>.SINGLE_SHOT[n] == 0b1.

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

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

ComponentOffset
ETE0x280 + 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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