The Four Stages of R-type

• Ifetch: Instruction Fetch

  • Fetch the instruction from the Instruction Memory

• Reg/Dec: Register acces and Instruction Decode

• Exec: ALU operates on the two register operands

• WrB: Write the ALU output back to the register file

Cycle 1

Cycle 2

Cycle 3

Cycle 4

R-type

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