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0. The first three steps used to fetch the instructions "ADD R1,R2" (in the CPU with single bus organization shown in question 7) are given below 1. PCout , MARin, Read, Select=0, Add, Zin 2. Zout , PCin , WMFC 3. MDRout, IRin The values in the PC, MAR, MDR and IR after Step 1 and Step 2 are shown above. What are the values of PC, MAR and IR after Step 3?
PC = X+1; MAR = X ; IR= ADD R1, R2.;
PC = X+1; MAR =X+1 ; IR = ADD R1, R2.;
PC = X; MAR =X ; IR = ADD R1, R2;
None of the above
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