cpu

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  • Control Unit
    • CPU
      • Buses
        • Definition:    a series of connectors that transfer signals between internal components?
        • Address
          • transmit the memory addresses specifying where data is to be sent to or retrieved from
            • one directional
        • Data
          • transporting data and instructions between components
            • bi-directional
              • transmit control signals between internal and external components
        • Control
          • transmit control signals between internal and external components
          • Memory read
          • memory write
          • bus grant
          • clock
          • bus request
      • Registers
        • Definition: are small amounts of high-speed memory and controls the fetch, decodee and execute cyle
        • Memory Address Register (MAR)
          • holds the address in memory where the processor is required to fetch or store data from or to?
        • Program counter (PC)
          • holds the memory address of the next instruction to be executed
        • Current Instruction Register (CIR)
      • Arithmetic-Logic Unit
        • Definition: The problem-solving part of the processor
        • Arithmetic + - x /
        • Logical : AND OR NOT XOR
        • Shift: moving bits to the left/right within a register
        • results are then stored in the accumulator (register)
    • Definition: The part of the processor that coordinates the activity of all other components.
    • It fetches, decodes and executes instruction
    • Control signals are sent along the control bus between the control unit and the other components of the computer
  • Memory Data Register (MDR)
    • temporarily holds data moving between the processor and main memory?
    • Registers
      • Definition: are small amounts of high-speed memory and controls the fetch, decodee and execute cyle
      • Memory Address Register (MAR)
        • holds the address in memory where the processor is required to fetch or store data from or to?
      • Program counter (PC)
        • holds the memory address of the next instruction to be executed
      • Current Instruction Register (CIR)
  • holds the results of calculations
    • Accumulator

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