GICM_IIDR Distributor Implementer Identification Register GIC Distributor MSI_base 0x0FCC GICM_IIDR RO Provides information about the implementer and revision of the Distributor. GICD This register is available in all configurations of the GIC. If the GIC implementation supports two Security states, this register is Common. GICM_IIDR is a 32-bit register. ProductID 31 24 31:24 Product Identifier. This field has an IMPLEMENTATION DEFINED value. RO 23 20 23:20 Reserved, RES0. Variant 19 16 19:16 Variant number. Typically, this field is used to distinguish product variants, or major revisions of a product. This field has an IMPLEMENTATION DEFINED value. RO Revision 15 12 15:12 Revision number. Typically, this field is used to distinguish minor revisions of a product. This field has an IMPLEMENTATION DEFINED value. RO Implementer 11 0 11:0 Contains the JEP106 code of the company that implemented the Distributor: Bits [11:8] are the JEP106 continuation code of the implementer. For an Arm implementation, this field is 0x4. Bit [7] is always 0. Bits [6:0] are the JEP106 identity code of the implementer. For an Arm implementation, bits [7:0] are therefore 0x3B. This field has an IMPLEMENTATION DEFINED value. RO 2026-03-26 20:27:25 2026-03_rel