OCR CS A Level - 1.1.1 Structure and Function of the Processor 2

What is the function of the Arithmetic and Logic Unit (ALU) in a processor?

• Completing arithmetical and logical operations

• Storing data temporarily

• Managing the flow of data between the CPU and other devices

• Directing operations inside the CPU

Which register holds the address of the next instruction to be executed?

• Program Counter (PC)

• Memory Data Register (MDR)

• Accumulator (ACC)

• Memory Address Register (MAR)

What is the purpose of the Control Bus in a processor?

• Writing data into the addressed location

• Requesting access to the CPU

• Transmitting memory addresses

• Transmitting control signals between internal and external components

What is the function of the Address Bus in a processor?

• Transmitting control signals between internal and external components

• Writing data into the addressed location

• Requesting access to the CPU

• Transmitting memory addresses

What is the purpose of pipelining in a processor?

• To complete arithmetical and logical operations

• To temporarily store data

• To manage the flow of data between the CPU and other devices

• To reduce the amount of the CPU which is kept idle

What is the advantage of Harvard Architecture over Von Neumann Architecture?

• Cheaper to develop since the control unit is easier to design

• Physically separate memories for instructions and data

• Shared memory and data bus used for both data and instructions

• Programs can be optimised in size

What is the purpose of the Fetch Phase in the fetch-decode-execute cycle?

• To copy the address from the PC to the MAR

• To copy the instruction held at the address to MDR

• To increase the contents of the PC by 1

• To copy the value held in the MDR to the CIR

What determines the clock speed of a CPU?

• The number of cores in the CPU

• The width of the bus

• The system clock

• The number of clock cycles completed in a second

What is the function of the Data Bus in a processor?

• Transporting data and instructions between components

• Transmitting memory addresses

• Requesting access to the CPU

• Transmitting control signals between internal and external components

What is the purpose of the Control Unit in a processor?

• Storing data temporarily

• Directing operations inside the CPU

• Completing arithmetical and logical operations

• Managing the flow of data between the CPU and other devices