Functions of The Control Unit
The control unit implements the instruction set of the CPU. It performs the tasks of fetching, decoding, managing execution and then storing results. It may manage the translation of instructions (not data) to micro-instructions and manage scheduling the micro-instructions between the various execution units. On some processors the control unit may be further broken down into other units, such as a scheduling unit to handle scheduling and a retirement unit to deal with results coming from the pipeline; It is the main function of CPU.
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