IO Systems: Important Questions

Digital Principles and Computer Organization:

Chapter 12: IO Systems

Important Questions

1. What is the necessity of an interface?

2. What are the functions of a typical I/O interface?

3. What are the functions performed by an I/O interface?

4. Explain the functions to be performed by a typical I/O interface with a typical input or output interface.

5. Explain how I/O devices can be interfaced with a block diagram.

6. Explain interface circuits.

7. Describe the various mechanism for accessing I/O devices.

8. Explain the following : Memory mapped I/O.

9. Give comparison between memory mapped I/O and I/O mapped I/O.

10. Compare I/O versus memory bus.

11. Distinguish between isolated and memory–mapped I/O.

12. Explain in detail about any two standard input and output interfaces required to connect the I/O device to the bus.

13. What do you mean by programmed I/O ?

14. Write short notes on polling.

15. What is interrupt?

16. What is the basic difference between branch instruction a call subroutine instruction and program interrupt?

17. Discuss the general steps involved in interrupt driven data transfer.

18. How does the processor handle an interrupt request?

19. Explain the following : Hardware interrupts.

20. Write short note on : Interrupts.

21. What are the steps in handling interrupts ?

22. Why are interrupt masks provided in any processor?

23. What is a non–maskable interrupt? What is the action performed on receipt of a NMI?

24. What are vectored interrupts ?

25. What do you mean by interrupt nesting?

26. State the advantages of DMA over the other modes of I/O transfer.

27. What is DMA operation? State its advantages.

28. Why do we need DMA ?

29. Write note on : DMA

30. Explain in detail about Direct Memory Access methods (DMA).

31. Discuss the DMA driven data transfer technique.

32. Comparison between I/O program controlled transfer and DMA transfer.

33. With a neat sketch explain the working principle of DMA.

34. Explain the DMA.

35. What are the necessary operations needed to start an I/O operation using DMA?

36. Explain how DMA transfer is accomplished with a neat diagram.

37. Explain the steps involved in the DMA operation.

38. Discuss direct memory access in detail.

39. What is meant by Direct Memory Access? Explain the use of DMA controllers in a computer system.

40. Draw the typical block diagram of a DMA controller and explain how it is used for direct data transfer between memory and peripherals ?

41. Explain about DMA controller, with the help of a block diagram.

42. Write a short note on SATA.

43. List the features of SATA.

44. List out types of interrupt. Explain any one.

45. What are priority interrupts? Explain any one interrupt priority scheme.

46. Explain daisy chain priority interrupt.

47. What is a bus? What are the different buses in a CPU?

48. Why data bus is bidirectional and address bus is unidirectional in most microprocessors ?

49. Discuss the operations of a bus.

50. What is a system bus?

51. Explain the single line bus structure.

52. Explain the multiple bus structure.

53. Draw and explain the timing diagram for synchronous input data transfer.

54. Draw and explain the timing diagram for synchronous output data transfer.

55. Explain the asynchronous data transfer using timing diagram.

56. Explain strobe controlled asynchronous data transfer.

57. Explain handshake protocol. Depict clearly how it controls data transfer during an input operation.

58. What are handshaking signals and what are the sequences of events during an input operation using handshake scheme?

59. Explain the buses.

60. Define bus arbitration.

61. How does bus arbitration typically work?

62. Write note on bus arbitration

63. What is meant by bus arbitration ?

64. With a neat diagram describe the implement of distributed arbitration.

65. Explain in detail about the bus arbitration techniques in DMA.

66. Write a note on peripheral communication.