Stage Computation: rrmovl P283 Figure 4.16 rrmovI ra. rB icode:ifun←-M1[Pc] Read instruction byte rA:rB←M1[Pc+们 Read register byte Fetch vaIP tPC+2 Compute next PC vaA←R[rA] Read operand A Decode vale(0+ valA Perform ALU operation Execute *vale Memory Write RrB]←vaE Write back result back PC update PC←vaP Update Pc a Formulate instruction execution as sequence of simple steps Use same general form for all instructions Processor– 12 – Processor Stage Computation: rrmovl P283 Figure 4.16 ◼ Formulate instruction execution as sequence of simple steps ◼ Use same general form for all instructions rrmovl rA, rB icode:ifun  M1 [PC] rA:rB  M1 [PC+1] valP  PC+2 Fetch Read instruction byte Read register byte Compute next PC valA  R[rA] Decode Read operand A valE  0 + valA Execute Perform ALU operation *valE Memory Write R[rB]  valE back Write back result PC update PC  valP Update PC