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Consider the following statements:
I. Daisy chaining is used to assign priorities in attending interrupts.
II. When a device raises a vectored interrupt, the CPU does polling to identify the source of interrupt.
III. In polling, the CPU periodically checks the status bits to know if any device needs its attention.
IV. During DMA, both the CPU and DMA controller can be bus masters at the same time.
Which of the above statements is/are TRUE?
  • a)
    l and III only
  • b)
    l and II only
  • c)
    III only
  • d)
    l and IV only
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements:I.Daisy chaining is used to assign p...
Explanation:

I. Daisy chaining is used to assign priorities in attending interrupts:
- This statement is true. Daisy chaining is a method used to assign priorities to different interrupt requests in a system. In this method, multiple devices are connected in a chain, and each device has a different priority level. When an interrupt occurs, the device with the highest priority in the chain is serviced first.

III. In polling, the CPU periodically checks the status bits to know if any device needs its attention:
- This statement is true. Polling is a technique used by the CPU to check the status of devices to see if they need attention. The CPU continuously checks the status bits of each device to determine if any device needs to be serviced.
Therefore, the correct answer is option 'A' - l and III only.
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Consider the following statements:I.Daisy chaining is used to assign priorities in attending interrupts.II.When a device raises a vectored interrupt, the CPU does polling to identify the source of interrupt.III.In polling, the CPU periodically checks the status bits to know if any device needs its attention.IV.During DMA, both the CPU and DMA controller can be bus masters at the same time.Which of the above statements is/are TRUE?a)l and III onlyb)l and II onlyc)III onlyd)l and IV onlyCorrect answer is option 'A'. Can you explain this answer?
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