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Control unit | | Control unit: Encyclopedia - Control unit | | | A control unit is the part of a CPU or other device that directs its operation. The outputs of the unit control the activity of the rest of the device. A control unit can be thought of as a finite state machine.
At one time control units for CPUs were ad-hoc logic, and they were difficult to design. Now they are often implemented as a microprogram that is stored in a control store. Words of the microprogram are selected by a microsequencer and the bits from those words directly control the different parts of the device, includi ...
| | | Control unit | | |
| | | Control unit: Encyclopedia - Control unit
Control unit
A control unit is the part of a CPU or other device that directs its operation. The outputs of the unit control the activity of the rest of the device. A control unit can be thought of as a finite state machine.
At one time control units for CPUs were ad-hoc logic, and they were difficult to design. Now they are often implemented as a microprogram that is stored in a control store. Words of the microprogram are selected by a microsequencer and the bits from those words directly control the different parts of the device, including the registers, arithmetic and logic units, instruction registers, buses, and off-chip input/output. In modern computers, each of these subsystems may have its own subsidiary controller, with the control unit acting as a supervisor. (See also CPU design and computer architecture.)
Category: Computer hardware
Other related archivesCPU, CPU design, Computer hardware, arithmetic and logic units, buses, computer architecture, control store, finite state machine, input/output, instruction registers, microprogram, microsequencer, registers
 Adapted from the Wikipedia article "Control unit", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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