In this exercise we examine in detail how an instruction is executed in a single

Question

In this exercise we examine in detail how an instruction is executed in a single- cycle datapath. Problems in this exercise refer to a clock cycle in which the processor fetches the following instruction word: What are the outputs of the sign-extend and the jump "Shift left 2" unit for this instruction word? (You will use a processor design in Figure 4. 24 and also at the last page) What are the values of aLU control unit's inputs for this instruction? What is the new PC address after this instruction is executed? The remaining problems in this exercise assume that data memory is all-zeros and that the processor's registers have the following values at the beginning of the cycle in which the above instruction word is fetched: Foe each Mux, show the values of its data output during the execution of this instruction and these register values. For the aLU and the two add units, what are their data input values? What are the values of all inputs for the "Registers" unit?

Explanation / Answer

a)8B430010 or 0010001100010000110000000000010000

b)1023000B or 0000010000001000110000000000001100

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