Understanding the FDE Cycle - Year 9

What is the main purpose of the fetch-decode-execute (FDE) cycle in a CPU?

• To save data

• To execute instructions from programs

• To display images

• To store user files

Which register holds the memory address of the next instruction to be fetched?

• ACC

• MAR

• CIR

• PC

During the FDE cycle, which of the following is true about the Control Unit?

• It fetches data from RAM

• It performs arithmetic operations

• It decodes the instruction

• It stores user files

What happens during the "fetch" stage of the FDE cycle?

• The instruction is executed

• The instruction is retrieved from memory

• The instruction is decoded

• The CPU accesses storage

Which component is responsible for performing arithmetic and logic operations during the execute stage?

• Control Unit (CU)

• Arithmetic Logic Unit (ALU)

• Memory Address Register (MAR)

• Program Counter (PC)

Which of the following correctly matches the FDE cycle stages to their functions?

• Fetch – Retrieves instruction; Decode – Interprets instruction; Execute – Carries out instruction

• Fetch – Executes instruction; Decode – Stores data; Execute – Decodes instruction

• Fetch – Stores data; Decode – Fetches instruction; Execute – Displays output

• Fetch – Holds result; Decode – Performs logic; Execute – Interprets command

What is the function of the Program Counter (PC) during the FDE cycle?

• It stores data temporarily

• It holds the address of the next instruction

• It performs arithmetic operations

• It stores user data permanently

What happens during the decode stage of the FDE cycle?

• The CPU performs the instruction

• The instruction is retrieved

• The CPU interprets the instruction to understand the operation

• The instruction is deleted

What does the Current Instruction Register (CIR) hold during the FDE cycle?

• The instruction currently being executed

• The address for the next instruction

• Arithmetic calculation results

• Data flow control signals

During which stage of the FDE cycle does the Control Unit interpret the instruction?

• Fetch

• Decode

• Execute

• Store