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A register block may be used to specify the interface of devices which contain registers associated with an integer address. Register blocks consist of register block members specified by the ``definition`` attribute. Register block members are either instances of registers specified by the ``registers`` attribute or instances of other register blocks specified by links with the "register-block-include" link role. Registers consists of bit fields. The register block members are placed into the address space of the device relative to the base address of the register block. Register member offests and the register block size are specified in units of the address space granule. Update #3715.