TRCIDR1 Trace ID Register 1 when FEAT_ETE is implemented and FEAT_TRC_EXT is implemented ETE 0x1E4 TRCIDR1 When OSLockStatus() or !IsTraceCorePowered() ERROR RO TRCIDR1 Architectural AArch64 31 0 31 0 31 0 31 0 Returns the tracing capabilities of the trace unit. Trace TRCIDR1 is a 32-bit register. DESIGNER 31 24 31:24 Indicates which company designed the trace unit. The permitted values of this field are the same as MIDR_EL1.Implementer. This field has an IMPLEMENTATION DEFINED value. RO 23 16 23:16 Reserved, RES0. 15 12 15:12 Reserved, RES1. TRCARCHMAJ 11 8 11:8 Major architecture version. All other values are reserved. This field reads as 0b1111. 0b1111 If both TRCIDR1.TRCARCHMAJ and TRCIDR1.TRCARCHMIN == 0xF then refer to TRCDEVARCH. RO TRCARCHMIN 7 4 7:4 Minor architecture version. All other values are reserved. This field reads as 0b1111. 0b1111 If both TRCIDR1.TRCARCHMAJ and TRCIDR1.TRCARCHMIN == 0xF then refer to TRCDEVARCH. RO REVISION 3 0 3:0 Implementation revision. Returns an IMPLEMENTATION DEFINED value that identifies the revision of the trace unit. Arm deprecates any use of this field and recommends that implementations set this field to zero. This field has an IMPLEMENTATION DEFINED value. RO 2026-03-26 20:27:25 2026-03_rel