PA Prerequisites

The primary function of the CPU is to:

• Perform arithmetic and logical operations

• Store data permanently

• Manage network connections

• Control peripheral devices

Which of the following connects the CPU, memory, and I/O devices in a computer system?

• System Bus

• ALU

• Cache Memory

• ROM

The Harvard architecture differs from the Von Neumann architecture because it

• Does not use a control unit

• Separates memory for instructions and data

• Has no arithmetic logic unit

• Uses cache memory

The first step of the instruction cycle is:

• Fetch

• Decode

• Execute

• Write-back

During the decode phase of the instruction cycle:

• Instructions are fetched from memory

• The CPU interprets the instruction

• Results are stored in memory

• Instructions are written to cache

The Von Neumann architecture uses

• Separate memory for instructions and data

• A single memory for instructions and data

• Only read-only memory

• Parallel processing units

The Program Counter (PC) holds:

• Data to be processed

• The memory address of the next instruction

• Temporary results of calculations

• Control signals

Registers like MAR and MBR are used for:

• Memory address storage and data transfer

• Arithmetic operations

• Program flow control

• Generating control signals

The term "opcode" in an instruction refers to:

• The operation to be performed

• The memory address

• The data to be operated upon

• The processor clock speed

In which addressing mode does the instruction specify the effective address directly?

• Direct addressing

• Immediate addressing

• Indirect addressing

• Indexed addressing