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A unified reservation station, also known as unified scheduler, is a decentralized feature of the microarchitecture of a CPU that allows for register renaming, and is used by the Tomasulo algorithm for dynamic instruction scheduling. Functional Units (such as an adder or a multiplier), each have their own corresponding Reservation Stations. The output of the Functional Unit connects to the Common Data Bus, where Reservation Stations are listening for the operands they need.