You copied the Doc URL to your clipboard.

GITS_IIDR, ITS Identification Register

The GITS_IIDR characteristics are:

Purpose

Provides information about the implementer and revision of the ITS.

Configuration

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

Attributes

GITS_IIDR is a 32-bit register.

Field descriptions

The GITS_IIDR bit assignments are:

313029282726252423222120191817161514131211109876543210
ProductIDRES0VariantRevisionImplementer

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 ITS:

  • 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 GITS_IIDR

GITS_IIDR can be accessed through the memory-mapped interfaces:

ComponentOffsetInstance
GIC ITS control0x0004GITS_IIDR

This interface is accessible as follows:

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


Was this page helpful? Yes No