Computer Organization and Architecture Mcqs

Page No. 20

The technique whereby the DMA controller steals the access cycles of the processor to operate is called __________


aFast conning


bMemory Con


cCycle stealing


dMemory stealing


View Answer Cycle stealing

Can a single DMA controller perform operations on two different disks simultaneously?


aTrue


bFalse


ceither true either false


dnone of the mentioned


View Answer True

The controller is connected to the ____


aProcessor BUS


bSystem BUS


cExternal BUS


dNone of the mentioned


View Answer System BUS

When the R/W bit of the status register of the DMA controller is set to 1.


aRead operation is performed


bWrite operation is performed


cRead & Write operation is performed


dNone of the mentioned



The DMA controller has _______ registers.


a4


b2


c3


d1


View Answer 3

After the completion of the DMA transfer, the processor is notified by __________


aAcknowledge signal


bnterrupt signal


cWMFC signal


dNone of the mentioned


View Answer nterrupt signal

In DMA transfers, the required signals and addresses are given by the __________


aProcessor


bevice drivers


cDMA controllers


dThe program itself


View Answer DMA controllers

The DMA transfers are performed by a control circuit called as __________


aDevice interface


bDMA controller


cData controller


dOverlooker


View Answer DMA controller

The DMA differs from the interrupt mode by __________


aThe involvement of the processor for the operation


bThe method of accessing the I/O devices


cThe amount of data transfer possible


dNone of the mentioned


View Answer None of the mentioned

If two devices A and B contesting for the BUS have ID’s 5 and 6 respectively, which device gets the BUS based on the Distributed arbitration.


aDevice A


bDevice B


cInsufficient information


done of the mentioned


View Answer Device B

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