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TRCCIDCCTLR1, Context Identifier Comparator Control Register 1

The TRCCIDCCTLR1 characteristics are:

Purpose

Contains Context identifier mask values for the TRCCIDCVR<n> registers, for n = 4 to 7.

Configuration

External register TRCCIDCCTLR1 bits [31:0] are architecturally mapped to AArch64 System register TRCCIDCCTLR1[31:0] .

RW fields in this register reset to architecturally UNKNOWN values.

This register is present only when TRCIDR4.NUMCIDC > 0x4, TRCIDR2.CIDSIZE > 0b00000 and ETE is implemented. Otherwise, direct accesses to TRCCIDCCTLR1 are RES0.

Attributes

TRCCIDCCTLR1 is a 32-bit register.

Field descriptions

The TRCCIDCCTLR1 bit assignments are:

313029282726252423222120191817161514131211109876543210
COMP7<m>, bit [m+24] COMP6<m>, bit [m+16] COMP5<m>, bit [m+8] COMP4<m>, bit [m]

COMP7<m>, bit [m+24], for m = 0 to 7

When TRCIDR4.NUMCIDC > 7:

TRCCIDCVR7 mask control. Specifies the mask value that the trace unit applies to TRCCIDCVR7. Each bit in this field corresponds to a byte in TRCCIDCVR7.

COMP7<m>Meaning
0b0

The trace unit includes TRCCIDCVR7[(m×8+7):(m×8)] when it performs the Context identifier comparison.

0b1

The trace unit ignores TRCCIDCVR7[(m×8+7):(m×8)] when it performs the Context identifier comparison.

This bit is RES0 if m >= TRCIDR2.CIDSIZE.

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


Otherwise:

Reserved, RES0.

COMP6<m>, bit [m+16], for m = 0 to 7

When TRCIDR4.NUMCIDC > 6:

TRCCIDCVR6 mask control. Specifies the mask value that the trace unit applies to TRCCIDCVR6. Each bit in this field corresponds to a byte in TRCCIDCVR6.

COMP6<m>Meaning
0b0

The trace unit includes TRCCIDCVR6[(m×8+7):(m×8)] when it performs the Context identifier comparison.

0b1

The trace unit ignores TRCCIDCVR6[(m×8+7):(m×8)] when it performs the Context identifier comparison.

This bit is RES0 if m >= TRCIDR2.CIDSIZE.

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


Otherwise:

Reserved, RES0.

COMP5<m>, bit [m+8], for m = 0 to 7

When TRCIDR4.NUMCIDC > 5:

TRCCIDCVR5 mask control. Specifies the mask value that the trace unit applies to TRCCIDCVR5. Each bit in this field corresponds to a byte in TRCCIDCVR5.

COMP5<m>Meaning
0b0

The trace unit includes TRCCIDCVR5[(m×8+7):(m×8)] when it performs the Context identifier comparison.

0b1

The trace unit ignores TRCCIDCVR5[(m×8+7):(m×8)] when it performs the Context identifier comparison.

This bit is RES0 if m >= TRCIDR2.CIDSIZE.

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


Otherwise:

Reserved, RES0.

COMP4<m>, bit [m], for m = 0 to 7

When TRCIDR4.NUMCIDC > 4:

TRCCIDCVR4 mask control. Specifies the mask value that the trace unit applies to TRCCIDCVR4. Each bit in this field corresponds to a byte in TRCCIDCVR4.

COMP4<m>Meaning
0b0

The trace unit includes TRCCIDCVR4[(m×8+7):(m×8)] when it performs the Context identifier comparison.

0b1

The trace unit ignores TRCCIDCVR4[(m×8+7):(m×8)] when it performs the Context identifier comparison.

This bit is RES0 if m >= TRCIDR2.CIDSIZE.

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


Otherwise:

Reserved, RES0.

Accessing the TRCCIDCCTLR1

If software uses the TRCCIDCVR<n> registers, for n = 4 to 7, then it must program this register.

If software sets a mask bit to 0b1 then it must program the relevant byte in TRCCIDCVR<n> to 0x00.

If any bit is 0b1 and the relevant byte in TRCCIDCVR<n> is not 0x00, the behavior of the Context Identifier Comparator is CONSTRAINED UNPREDICTABLE. In this scenario the comparator might match unexpectedly or might not match.

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

TRCCIDCCTLR1 can be accessed through the external debug interface:

ComponentOffset
ETE0x684

This interface is accessible as follows:

  • When OSLockStatus(), or !AllowExternalTraceAccess() or !IsTraceCorePowered() access to this register returns an Error.
  • Otherwise access to this register is RW.


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