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

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].

This register is present only when FEAT_ETE is implemented, FEAT_TRC_EXT is implemented and UInt(TRCIDR4.NUMSSCC) > n. Otherwise, direct accesses to TRCSSCCR<n> are RES0.

Attributes

TRCSSCCR<n> 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	ARC[7]	ARC[6]	ARC[5]	ARC[4]	ARC[3]	ARC[2]	ARC[1]	ARC[0]	SAC[15]	SAC[14]	SAC[13]	SAC[12]	SAC[11]	SAC[10]	SAC[9]	SAC[8]	SAC[7]	SAC[6]	SAC[5]	SAC[4]	SAC[3]	SAC[2]	SAC[1]	SAC[0]

Bits [31:25]

Reserved, RES0.

RST, bit [24]

Selects the Single-shot Comparator Control mode.

RST	Meaning
0b0	The Single-shot Comparator Control is in single-shot mode.
0b1	The Single-shot Comparator Control is in multi-shot mode.

The reset behavior of this field is:

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

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

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.

The reset behavior of this field is:

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

Accessing this field has the following behavior:

When m >= UInt(TRCIDR4.NUMACPAIRS), access to this field is RES0.
Otherwise, access to this field is RW.

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

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.

The reset behavior of this field is:

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

Accessing this field has the following behavior:

When m >= UInt(TRCIDR4.NUMACPAIRS) * 2, access to this field is RES0.
Otherwise, access to this field is RW.

Accessing TRCSSCCR<n>

Must be programmed if any TRCRSCTLR<a>.GROUP == 0b0011 and TRCRSCTLR<a>.SINGLE_SHOT[n] == 1.

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

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

Component	Offset	Instance
ETE	0x280 + (4 * n)	TRCSSCCR<n>

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.