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6. Understanding the MAR and the MDR

  • MAR stands for memory address register:

    • MAR is connected to the address bus.

    • MAR is "the only way" for the CPU to communicate with address bus.

    • Tri-state buffer between MAR and the address bus prevents MAR from continously dumping its output to the address bus.

    • MAR can hold either an instruction address or a data address.

     

  • Memory Circuitry:

      Understanding the MAR and the MDR

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