When an I/O device completes an I/O operation, which of the following is/are not correct regarding the sequences of hardware events?a)The device issues an interrupt signal to the processor.b)Processor finishes the execution of current instruction after responding to the interrupt.c)Processor need to save information to resume the current program at the point of interrupt.d)Minimum information required to save to resume the current program at the point of interrupt is only the status of the processor.Correct answer is option 'A,C'. Can you explain this answer? - EduRev Computer Science Engineering (CSE) Question

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When an I/O device completes an I/O operation, which of the following is/are not correct regarding the sequences of hardware events?

a)
The device issues an interrupt signal to the processor.
b)
Processor finishes the execution of current instruction after responding to the interrupt.
c)
Processor need to save information to resume the current program at the point of interrupt.
d)
Minimum information required to save to resume the current program at the point of interrupt is only the status of the processor.

Correct answer is option 'A,C'. Can you explain this answer?

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When an I/O device completes an I/O operation, which of the following ...

Answer:
When an I/O device completes an I/O operation, there are several hardware events that occur. Let's analyze each option and determine if it is correct or not:

a) The device issues an interrupt signal to the processor:
This statement is incorrect. When an I/O device completes an I/O operation, it does not issue an interrupt signal to the processor. Instead, it notifies the device driver or the operating system. The device driver or the operating system then handles the completion of the I/O operation.

b) Processor finishes the execution of the current instruction after responding to the interrupt:
This statement is correct. When the processor receives an interrupt signal, it suspends the execution of the current instruction and saves the context. It then jumps to the interrupt service routine (ISR) to handle the interrupt. After the ISR is executed, the processor resumes the execution of the interrupted instruction.

c) Processor needs to save information to resume the current program at the point of interrupt:
This statement is correct. When an interrupt occurs, the processor needs to save the necessary information to resume the current program at the point of interrupt. This includes saving the current state of the registers, the program counter, and any other relevant information.

d) Minimum information required to save to resume the current program at the point of interrupt is only the status of the processor:
This statement is incorrect. The minimum information required to save to resume the current program at the point of interrupt is not only the status of the processor. It also includes saving the current state of the registers, the program counter, and any other relevant information as mentioned earlier.

In conclusion, the correct options are A and C. The device does not issue an interrupt signal to the processor when it completes an I/O operation, and the minimum information required to save to resume the current program at the point of interrupt is not only the status of the processor.

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When an I/O device completes an I/O operation, which of the following ...

When an I/O device completes an I/O operation, the following sequence of hardware events occurs:

The device issues an interrupt signal to the processor.
The processor finishes the execution of the current instruction before responding to the interrupt.
The processor test for an interrupt and sends an acknowledgment signal to the device that issued the interrupt.
The processor now needs to save information needed to resume the current program at the point of an interrupt.
information saved to be is the status of the processor and the location of the next instruction to be executed.
The processor now loads the program counter with the entry location of the interrupt handling program.
The interrupt handler next processes the interrupt.
After interrupt processing, saved register values are retrieved from the stack and restored and the next instruction will be executed.

Hence, the correct options are (A) and (C).

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When an I/O device completes an I/O operation, which of the following is/are not correct regarding the sequences of hardware events?a)The device issues an interrupt signal to the processor.b)Processor finishes the execution of current instruction after responding to the interrupt.c)Processor need to save information to resume the current program at the point of interrupt.d)Minimum information required to save to resume the current program at the point of interrupt is only the status of the processor.Correct answer is option 'A,C'. Can you explain this answer?

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