Computer System Architecture - Microprogrammed Control

12. Which of the following set of control signals can be used to transfer data from register R4 to register R5?

  • Option : A
  • Explanation : For the data transfer to take place, the data output of register R4 should
    be enabled (R4out) and the data load control of R5 should be activated
    (R5in).
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13. Which of the following statements are true when the control signals PCout, MARin, and READ are activated simultaneously?

  • Option : A
  • Explanation : Option A, C and D are correct.
    When the control signals PCout and MARin are activated, the contents of PC will get transferred via the internal processor bus to the MAR register. And since READ is also active, the address in MAR will be used to initiate a read operation to memory to fetch the next instruction.
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