Computer organization mcqs direct memory access

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Computer organization mcqs direct memory access

Question 1 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The DMA differs from the interrupt mode by .....
A
The involvement of the processor for the operation
B
The method of accessing the I/O devices
C
The amount of data transfer possible
D
None of the mentioned
Question 1 Explanation: 
DMA is an approach of performing data transfers in bulk between memory and the external device without the intervention of the processor.
Question 2 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The DMA transfers are performed by a control circuit called as .....
A
Device interface
B
DMA controller
C
Data controller
D
Overlooker
Question 2 Explanation: 
The Controller performs the functions that would normally be carried out by the processor.
Question 3 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In DMA transfers, the required signals and addresses are given by the .....
A
Processor
B
Device drivers
C
DMA controllers
D
The program itself
Question 3 Explanation: 
The DMA controller acts as a processor for DMA transfers and overlooks the entire process.
Question 4 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
After the completion of the DMA transfer, the processor is notified by .....
A
Acknowledge signal
B
Interrupt signal
C
WMFC signal
D
None of the mentioned
Question 4 Explanation: 
The controller raises an interrupt signal to notify the processor that the transfer was complete.
Question 5 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The DMA controller has ..... registers.
A
4
B
2
C
3
D
1
Question 5 Explanation: 
The Controller uses the registers to store the starting address, word count and the status of the operation.
There are 5 questions to complete.

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