Understanding the Fetch Decode Execute Cycle

What is the first step in the Fetch Decode Execute cycle?

• Execute

• Decode

• Fetch

• Store

How does the CPU identify the next instruction to fetch?

• The CPU identifies the next instruction to fetch using the Program Counter (PC).

• The CPU identifies the next instruction using the Cache Memory.

• The CPU fetches instructions based on the last executed instruction.

• The CPU uses the Memory Address Register (MAR) to fetch instructions.

What role does the program counter play in instruction fetching?

• The program counter manages memory allocation for the program.

• The program counter is responsible for executing the current instruction.

• The program counter stores the results of the last instruction executed.

• The program counter holds the address of the next instruction to be fetched.

What happens to the instruction after it is fetched?

• The instruction is immediately executed without any processing.

• The instruction is stored in memory for later use.

• The instruction is decoded and prepared for execution.

• The instruction is discarded and not used.

Define instruction decoding in the context of the CPU.

• Instruction decoding is the method of generating binary instructions from high-level code.

• Instruction decoding refers to the storage of binary instructions in the CPU.

• Instruction decoding is the process of interpreting binary instructions in the CPU to determine the operation and operands.

• Instruction decoding is the process of executing binary instructions in the CPU.

What is the purpose of the instruction register?

• To store the results of arithmetic operations.

• To manage memory allocation for programs.

• To control the flow of data between devices.

• To hold the current instruction being executed by the CPU.

How does the control unit contribute to instruction decoding?

• The control unit decodes instructions by interpreting opcodes and generating control signals for execution.

• The control unit generates data outputs without interpreting opcodes.

• The control unit only manages memory access during instruction execution.

• The control unit executes instructions directly without decoding.

What are the different types of instructions that can be executed?

• Memory allocation

• Network protocols

• Arithmetic operations

• Data processing, control flow, input/output, system instructions.

Explain the execution phase of the Fetch Decode Execute cycle.

• The execution phase involves carrying out the decoded instruction, performing operations, and storing results.

• The execution phase is solely responsible for decoding instructions.

• The execution phase is when the CPU shuts down to save power.

• The execution phase only involves fetching instructions from memory.

What components are involved in executing an instruction?

• Power Supply

• Control Unit, Arithmetic Logic Unit, Registers, Memory.

• Input/Output Devices

• Network Interface Card