UVM Register Abstraction Layer provides a structured representation of programmable hardware through register fields, registers, memories, register blocks, and address maps. Register fields define bit-level behavior and access policies, while register blocks and maps organize programmable resources according to hardware hierarchy and bus-specific address views. Multiple and dynamic address maps support complex subsystem and SoC environments in which the same register resources may appear through different masters, interfaces, or runtime configurations. Front-door access converts generic register operations into target-bus transactions through uvm_reg_adapter, register maps, sequencers, and bus agents. Bidirectional adapter translation allows returned bus information to update register-level operations. Explicit, automatic, and passive prediction mechanisms maintain mirrored register state as hardware accesses occur. Backdoor access provides direct simulator-level access through hierarchical HDL paths, allowing fast reads and writes without normal bus timing while supporting separate RTL and gate-level path definitions. Register-level stimulus uses logical register and field names...