Lecture note Computer Organization - Part 4: The control unit
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Lecture note Computer Organization - Part 4: The control unit
Part FourIn Part Three, we focused on machine instructions and the operations performed by the processor to execute each instruction. What was left ou Lecture note Computer Organization - Part 4: The control unitut of this discussion is exactly how each individual operation is caused to happen. This is the job of the control unit.The control unit is that portion of the processor that actually causes things to happen. The control unit issues control signals external to the processor to cause data exchange wi Lecture note Computer Organization - Part 4: The control unitth memory and I/O modules. The control unit also issues control signals internal to the processor to move data between registers, to cause the ALU toLecture note Computer Organization - Part 4: The control unit
perform a specified function, and to regulate other internal operations. Input to the control unit consists of the instruction register. Hags, and conPart FourIn Part Three, we focused on machine instructions and the operations performed by the processor to execute each instruction. What was left ou Lecture note Computer Organization - Part 4: The control uniterrupt CycleThe Execute CycleThe Instruction Cycle152Control of the ProcessorFunctional RequirementsControl SignalsA Control Signals ExampleInternal Processor OrganizationThe Intel 8085153Hardwired ImplementationControl Unit InputsControl Unit Logic15.4 Recommended Reading155 Key Terms, Review Quest Lecture note Computer Organization - Part 4: The control unitions, and Problems561KEY POINTS♦The execution of an instruction involves the execution of a sequence of substeps, generally called cycles. For exampleLecture note Computer Organization - Part 4: The control unit
, an execution may consist of fetch, indirect, execute, and interrupt cycles. Each cycle is in turn made up of a sequence of more fundamental operatioPart FourIn Part Three, we focused on machine instructions and the operations performed by the processor to execute each instruction. What was left ou Lecture note Computer Organization - Part 4: The control unitus. or a simple ALU operation.♦The control unit of a processor performs two tasks: (1) It causes the proccs- sor to step through a scries of micro-operations in the proper sequence, based on the program being executed, and (2) it generates the control sig- nals that cause each micro-operation to be Lecture note Computer Organization - Part 4: The control unitexecuted.♦The control signals generated by the control unit cause the opening and closing of logic gates, resulting in the transfer of data to and froLecture note Computer Organization - Part 4: The control unit
m registers and the operation of the ALU.♦One technique for implementing a control unit is referred to as hardwired implementation, in which the contrPart FourIn Part Three, we focused on machine instructions and the operations performed by the processor to execute each instruction. What was left ou Lecture note Computer Organization - Part 4: The control unitol signals.In Chapter 10. we pointed out that a machine instruction set goes a long way toward defining the processor. If we know the machine instruction set. including an under- standing of the effect of each opcode and an understanding of the addressing modes, and if we know the set of user-visibl Lecture note Computer Organization - Part 4: The control unite registers, then we know the functions that the processor must perform. This is not the complete picture. We must know the external interfaces, usualLecture note Computer Organization - Part 4: The control unit
ly through a bus. and how interrupts arc handled. With this line of rea- soning. the following list of those things needed to specify the function of Part FourIn Part Three, we focused on machine instructions and the operations performed by the processor to execute each instruction. What was left ouPart FourIn Part Three, we focused on machine instructions and the operations performed by the processor to execute each instruction. What was left ouGọi ngay
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