Operating Systems & Computer Architecture CT049-3-1-OS&CA Ver: VE CPU and Memory Topics
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Questions and Answers

What is the function of the Program Count Register (PC)?

  • Determines memory capacity
  • Tests contents for conditions
  • Stores instruction fetched from memory (correct)
  • Stores values from other locations

    • What is the role of the Instruction Register (IR)?

  • Stores instruction fetched from memory (correct)
  • Stores values from other locations
  • Shifts or rotates data
  • Determines memory capacity

    • What does the Memory Data Register (MDR) do?

  • Stores instruction fetched from memory
  • Shifts or rotates data
  • Tests contents for conditions
  • Stores values from other locations (registers and memory) (correct)

    • What determines the memory capacity?

    <p>Number of bits in the Memory Address Register (MAR)</p> Signup and view all the answers

    Which type of RAM requires refreshing thousands of times each second?

    <p>DRAM (Dynamic RAM)</p> Signup and view all the answers

    What is the function of the ALU in a CPU?

    <p>Performs calculations and comparisons</p> Signup and view all the answers

    What is the main function of the control unit in a CPU?

    <p>Performs fetch/execute cycle</p> Signup and view all the answers

    What is the purpose of registers in a CPU?

    <p>Hold data needed quickly or frequently</p> Signup and view all the answers

    Which component of the CPU is responsible for supervising fetching instructions and data from memory?

    <p>Memory management unit</p> Signup and view all the answers

    What are General Purpose Registers in a CPU mainly used for?

    <p>Holding intermediate results or data values</p> Signup and view all the answers

    Study Notes

    CPU Registers and Components

    • The Program Count Register (PC) holds the memory address of the next instruction to be fetched.
    • The Instruction Register (IR) stores the current instruction being executed.
    • The Memory Data Register (MDR) temporarily holds data being transferred between the CPU and memory.

    Memory Capacity

    • The memory capacity is determined by the number of address lines and the number of bits in each word.

    RAM

    • Dynamic RAM (DRAM) requires refreshing thousands of times each second to maintain the stored data.

    ALU

    • The Arithmetic Logic Unit (ALU) performs arithmetic and logical operations, such as addition, subtraction, AND, and OR.

    Control Unit

    • The control unit retrieves and decodes instructions, generates control signals, and manages data flow between components.

    Registers

    • Registers in a CPU are small amounts of on-chip memory that store data temporarily while it is being processed.
    • The purpose of registers is to provide quick access to data and reduce the time it takes to access memory.

    Control Unit Function

    • The control unit is responsible for supervising the fetch-decode-execute cycle, which includes fetching instructions and data from memory.

    General Purpose Registers

    • General Purpose Registers in a CPU are used to store both data and addresses, and are used for various operations, such as arithmetic and logical instructions.

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    Description

    Test your knowledge of CPU components, memory unit, fetch-execute cycle, buses, instructions, and word formats in the context of operating systems and computer architecture.

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