The Fetch-Decode-Execute Cycle Bitesize

What architecture provides the basis for the majority of computers used today?

• Harvard architecture

• RISC architecture

• Quantum architecture

• Von Neumann architecture

What is the first step in the fetch-decode-execute cycle?

• The memory address is copied into the MAR

• The processor sends a signal along the address bus

• The instruction is executed

• The instruction/data is sent along the data bus to the MDR

What does MAR stand for?

• Main Address Register

• Memory Access Register

• Main Access Register

• Memory Address Register

What happens after the memory address is copied into the MAR?

• Data is transferred to the specified address

• The instruction/data is decoded

• The address in the program counter is incremented

• The instruction is executed

What is the role of the address bus in the fetch-decode-execute cycle?

• To request data from an address in memory

• To decode the data

• To store results of processing

• To execute instructions

Where is the instruction/data held before it is copied into the CIR?

• ACC

• MAR

• MDR

• Program counter

What does CIR stand for?

• Central Instruction Register

• Current Instruction Repository

• Control Instruction Register

• Current Instruction Register

What additional step may be taken if the instruction requires transferring data back to primary memory?

• The program counter is incremented

• The data is copied into the CIR

• The memory address is copied into the MAR

• The instruction is immediately executed

What happens if the executed instruction requires the program to jump to a different place in the program?

• The memory address of the new instruction is copied into the MAR

• The instruction/data is sent along the data bus to the MDR

• The memory address of the new next instruction is copied into the program counter

• The data to be transferred is copied into the MDR

What is stored in the ACC after an instruction is executed?

• The memory address of the next instruction

• The decoded instruction

• Results of processing

• The next instruction to be fetched