Show the steps of the CPU fetch–execute cycle for the Input and Output instructions. Take ADD instruction as an example, PC→MAR MDR→IR IRaddress→MAR A+MDR→A PC+1→PC
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Show the steps of the CPU fetch–execute cycle for the Input and Output instructions.
Take ADD instruction as an example,
PC→MAR
MDR→IR
IRaddress→MAR
A+MDR→A
PC+1→PC
Give me the steps like this
Step by step
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- How does pipelining improve CPU efficiency? What’s the potential effect on pipelining’s efficiency when executing a conditional BRANCH instruction? What techniques can be used to make pipelining more efficient when executing conditional BRANCH instructions?A(n) ________________ instruction always alters the instruction execution sequence. A(n) ______________ instruction alters the instruction execution sequence only if a specified Condition is true._____ is a CPU design technique in which instruction execution is divided into multiple stages and different instructions can execute in different stages simultaneously.
- The time it takes to perform the fetch instruction and decode instruction steps is called the execution time. True or false?Identify the three elements of a CPU and describe the role of each.Processor R is a 64-bit RISC processor with a 2 GHz clock rate. The average instruction requires one cycle to complete, assuming zero wait state memory accesses. Processor C is a CISC processor with a 1.8 GHz clock rate. The average simple instruction requires one cycle to complete, assuming zero wait state memory accesses. The average complex instruction requires two cycles to complete, assuming zero wait state memory accesses. Processor R can’t directly implement the complex processing instructions of Processor C. Executing an equivalent set of simple instructions requires an average of three cycles to complete, assuming zero wait state memory accesses. Program S contains nothing but simple instructions. Program C executes 70% simple instructions and 30% complex instructions. Which processor will execute program S more quickly? Which processor will execute program C more quickly? At what percentage of complex instructions will the performance of the two processors be equal?
- How can we avoid wasting processing cycles when a CPU executes many instructions simultaneously? Which aspects of this procedure are the most crucial? What are their effects?How can we minimize the CPU time wasted by concurrently executing several instructions? Which steps in this procedure are the most crucial, and why? What impact do they have?How can a multi-threaded computer processor make efficient use of the computing cycles it would have used if it were just processing a single instruction? Detail what happened because of their behavior in the preceding phrase.
- How can a multi-instruction processor avoid wasting calculation cycles? Explain what happened because of their actions.The time required for the fetching and execution of one simple machine instruction is CPU cycle why?Suppose an instruction takes four cycles to execute in a nonpipelined CPU: one cycle to fetch the instruction, one cycle to decode the instruction, one cycle to perform the ALU operation, and one cycle to store the result. In a CPU with a four-stage pipeline, that instruction still takes four cycles to execute, so how can we say the pipeline speeds up the execution of the program?