Q4

MCQ1 mark, −0.33

Consider the following data path diagram.

Consider an instruction: $R0 \leftarrow R1 +R2$ . The following steps are used to execute it over the given data path. Assume that PC is incremented appropriately. The subscripts $r$ and $w$ indicate read and write operations, respectively. Which one of the following is the correct order of execution of the above steps? $2,1,4,5,3$ $1,2,4,3,5$ $3,5,2,1,4$ $3,5,1,2,4$

(A)

$R2_{r},\text{ TEMP1}_{r},ALU_{\text{add}}, \text{ TEMP2}_{w}$

(B)

$R1_{r},\text{ TEMP1}_{w}$

(C)

$PC_{r}, \text{ MAR}_{w}, \text{ MEM}_{r}$

(D)

$\text{ TEMP2}_{r}, \text{ R0}_{w}$

(E)

$\text{ MDR}_{r}, \text{ IR}_{w}$

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