Question: What is the processor's operation (Instruction Execution) Cycle.

Can someone help explain this question? Provided below is the image from my textbook on the cycle.

Also, my textbook talks about three basic steps: Fetch, Decode and Execute. I am a little confused on this topic and the pathway to execute an instruction.

FIGURE 2-2 Simplified CPU block diagram. Code cache Data bus Instruction pointer Addros Memory Code Instruction decoder Data Control unit Floating-point unit Registers ALU Data cache