Computer Organization: Address Bus
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Questions and Answers

How many different addresses can the 16-bit address bus specify?

  • 65,536 (correct)
  • 32,768
  • 16,384
  • 131,072

    • What is the primary function of the address decoder?

  • To translate I/O data
  • To generate the control signals for the microprocessor
  • To ensure only one IC is active at a time (correct)
  • To control the flow of data between ICs

    • What type of data is stored in ROM?

  • Temporary data for processing
  • Input port data
  • Output port data
  • Initialization instructions and subroutines (correct)

    • What happens to the contents of RAM when power is turned off?

    <p>It is lost</p> Signup and view all the answers

    What is the purpose of the control bus?

    <p>To carry control signals for the ICs</p> Signup and view all the answers

    What is the width of the data bus?

    <p>8 bits</p> Signup and view all the answers

    What provides data to the microprocessor?

    <p>Input port</p> Signup and view all the answers

    What is the purpose of the monitor program?

    <p>To initialize the microprocessor</p> Signup and view all the answers

    What is the primary purpose of an output port?

    <p>To provide a way for the microprocessor to talk to the outside world</p> Signup and view all the answers

    What triggers the D flip-flop to latch onto the data on the data bus?

    <p>A clock trigger pulse from the control bus</p> Signup and view all the answers

    What is the role of the address decoder in the output port?

    <p>To issue a pulse on the write line to the control bus</p> Signup and view all the answers

    What is the function of the octal D flip-flop in the output port?

    <p>To latch onto data from the data bus and drive the LEDs</p> Signup and view all the answers

    What is the purpose of the input port in this system?

    <p>To receive data from an input device and dump it to the data bus</p> Signup and view all the answers

    What is the sequence of events to load the D flip-flop?

    <p>The microprocessor sets up the data bus, then the address, and finally the clock trigger pulse</p> Signup and view all the answers

    Study Notes

    Address Bus

    • The address bus is 16 bits wide, allowing it to specify 65,536 different addresses.
    • The low-order bits on the address bus select a particular location within a selected memory IC.
    • The address bus is used by the microprocessor to select a particular location or IC to be active.

    Data Bus

    • The data bus is bidirectional, allowing the microprocessor to send or receive 8 bits of data to or from a selected address.
    • The data bus is used for data transfer between the microprocessor and memory or I/O devices.

    Control Bus

    • The control bus carries control signals that are tapped into by other ICs to determine the type of operation being performed.
    • The control signals indicate whether the operation is a read, write, I/O, memory access, or other operation.

    Address Decoder

    • The address decoder is usually an octal decoder that ensures only one IC is active at a time to avoid bus conflicts.
    • The address decoder receives information from the microprocessor via the control and address buses to determine which IC to activate.

    Memory

    • ROM (Read-Only Memory) contains initialization instructions and subroutines that can be called by the microprocessor.
    • The monitor program or operating system is stored in ROM and is permanently stored.
    • RAM (Random Access Memory) is volatile, meaning it loses its contents when power is turned off, and is used for temporary data storage.

    Input Port

    • The input port provides data to the microprocessor via the data bus.
    • It is an octal buffer with three-stated outputs and receives input from devices like a keyboard or toggle switches.
    • The input port dumps its information to the data bus when it receives a chip enable from the address decoder and a read command from the control bus.

    Output Port

    • The output port provides a way for the microprocessor to talk to the outside world.
    • It can send data to output devices like printers or LEDs.
    • An octal D flip-flop is used as the interface, and the microprocessor must set up the data bus and address of the output port to load the D flip-flop.

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    Description

    This quiz covers the basics of the address bus in computer organization, including its width, functionality, and address specification.

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