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GICD_IIDR, Distributor Implementer Identification Register

The GICD_IIDR characteristics are:

Purpose

Provides information about the implementer and revision of the Distributor.

Configuration

This register is available in all configurations of the GIC. If the GIC implementation supports two Security states, this register is Common.

Attributes

GICD_IIDR is a 32-bit register.

Field descriptions

The GICD_IIDR bit assignments are:

313029282726252423222120191817161514131211109876543210
ProductID0000VariantRevisionImplementer

ProductID, bits [31:24]

An IMPLEMENTATION DEFINED product identifier.

Bits [23:20]

Reserved, RES0.

Variant, bits [19:16]

An IMPLEMENTATION DEFINED variant number. Typically, this field is used to distinguish product variants, or major revisions of a product.

Revision, bits [15:12]

An IMPLEMENTATION DEFINED revision number. Typically, this field is used to distinguish minor revisions of a product.

Implementer, bits [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.

Accessing the GICD_IIDR

GICD_IIDR can be accessed through the memory-mapped interfaces:

ComponentOffsetInstance
GIC Distributor0x0008GICD_IIDR

This interface is accessible as follows:

  • When GICD_CTLR.DS == 0b0 access to this register is RO.
  • When IsAccessSecure() access to this register is RO.
  • When !IsAccessSecure() access to this register is RO.


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