CPU Architecture Quiz

What is the first step of the Fetch-Decode-Execute cycle?

• Decode

• Fetch

• Execute

• Store

Which component holds the address of the next instruction to be fetched?

• CU

• MDR

• PC

• MAR

What does the MAR (Memory Address Register) do?

• Stores the data to be written to memory

• Holds the address of the memory location to be accessed

• Performs calculations

• Decodes instructions

Which component decodes the instructions?

• ALU

• ACC

• CU

• MDR

The ALU is responsible for:

• Fetching data from memory

• Performing calculations and logical operations

• Storing the next instruction

• Controlling data flow

The MDR (Memory Data Register) holds:

• The address of the next instruction

• The data that has been fetched or is to be written to memory

• The result of an operation

• The control signals

What is the function of the ACC (Accumulator)?

• It stores intermediate results of calculations

• It fetches instructions from memory

• It decodes instructions

• It holds the address of the next instruction

During the decode stage, the CU:

• Executes the instruction

• Interprets the instruction fetched

• Stores the result

• Fetches data from memory

The CIR (Current Instruction Register):

• Stores the address of the next instruction

• Holds the instruction currently being executed

• Controls the flow of data

• Performs logical operations

What happens during the execute stage?

• Instructions are interpreted

• Results are stored in memory

• The CPU performs the instruction's operation

• Instructions are fetched