Question

3. Use any one of the following instructions to explain the steps of the fetch-decode- execute cycle. Your explanation should include what is happening in the related registers. (10 points) Binary Contents of Hex Contents Memory Address Address Instruction of Memory 100 Load 104 0001000100000100 101 Add 105 102 Store 106 0100000100000110 103 Halt 104 0023 105 FFES 106 0000 1104 0011000100000101 4106 7000 0111000000000000 0000000000100011 0023 FEE9

Answer 1

ADD 105 :-

3 Stage Pipeline :-

FETCH :-

PC - 100
Fetches instruction from PC pointed address and increases the PC counter to next location

Decode :-
Instruction is decoded and the registers used in the instruction are decoded here

Execute :-
The register are read from register bank; and according to the instruction shift and ALU operation is performed and result is written back to the register file