Computer Instruction Format: Timing and Control
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Questions and Answers

What controls the timing for all registers in a basic computer?

  • Data signals
  • Address lines
  • Control unit
  • Master clock generator (correct)
  • When are the state changes of a register triggered by clock pulses?

  • When the clock pulses are strong
  • When the register is enabled by a control signal (correct)
  • When the register is disabled
  • Always
  • What provides control inputs for the multiplexers in the common bus?

  • Master clock generator
  • Data bus
  • Processor registers
  • Control unit (correct)
  • Which type of control organization uses gates, flip-flops, and decoders to implement control logic?

    <p>Hardwired control</p> Signup and view all the answers

    What is an advantage of hardwired control organization?

    <p>Produces fast mode of operation</p> Signup and view all the answers

    In micro programmed organization, where is the control information stored?

    <p>Control memory</p> Signup and view all the answers

    What micro operation is performed when executing the 'AND to AC' instruction?

    <p>DR ← M[AR], AC ←AC Λ DR, SC ← 0</p> Signup and view all the answers

    What does the 'STA : Store AC' instruction do?

    <p>Stores the content of AC into the memory word specified by the effective address</p> Signup and view all the answers

    Why is it necessary to first read the memory word into DR before transferring it to AC in the 'LDA : Load to AC' instruction?

    <p>To avoid delays in the adder and logic circuit</p> Signup and view all the answers

    What does the 'BUN : Branch Unconditionally' instruction do?

    <p>Transfers the program to the instruction specified by the effective address</p> Signup and view all the answers

    Which flip-flop is affected by executing the 'ADD to AC' instruction?

    <p>Extended accumulator flip-flop (E)</p> Signup and view all the answers

    What happens when executing the 'BSA : Branch and Save Return Address' instruction?

    <p>The program branches and saves a return address for later use</p> Signup and view all the answers

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