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examine, in general, the microarchitecture that exists at the control level of moderncomputers.All computers have a central processing unit. This unit can be divided intotwo pieces. The first is the datapath, which is a network of storage units (registers)and arithmetic and logic units (for performing various operations on data)connected by buses (capable of moving data from place to place) where the timingis controlled by clocks. The second CPU component is the control unit, amodule responsible for sequencing operations and making sure the correct data iswhere it needs to be at the correct time. Together, these components perform thetasks of the CPU: fetching instructions, decoding them, and finally performingthe indicated sequence of operations. The performance of a machine is directlyaffected by the design of the datapath and the control unit. Therefore, we coverthese components of the CPU in detail in the following sections.
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