Test: Bus Arbitration

QUESTION: 1

To resolve the clash over the access of the system BUS we use ______

A.
Multiple BUS
B.
BUS arbitrator
C.
Priority access
D.
None of the mentioned

Solution:

Answer: b
Explanation: The BUS arbitrator is used to allow a device to access the BUS based on certain parameters.

QUESTION: 2

The device which is allowed to initiate data transfers on the BUS at any time is called _____

A.
BUS master
B.
Processor
C.
BUS arbitrator
D.
Controller

Solution:

Answer: a
Explanation: The device which is currently accessing the BUS is called as the BUS master.

QUESTION: 3

______ BUS arbitration appproach uses the involvement of the processor

A.
Centralised arbitration
B.
Distributed arbitration
C.
Random arbitration
D.
All of the mentioned

Solution:

Answer: a
Explanation: In this approach the processor takes into account the various parameters and assigns the BUS to that device.

QUESTION: 4

The circuit used for the request line is a _________

A.
Open-collector
B.
EX-OR circuit
C.
Open-drain
D.
Nand circuit

Solution:

QUESTION: 5

The Centralised BUS arbitration is similar to ______ interrupt circuit

A.
Priority
B.
Parallel
C.
Single
D.
Daisy chain

Solution:

QUESTION: 6

When the processor recieves the request from a device, it responds by sending _____

A.
Acknowledge signal
B.
BUS grant signal
C.
Response signal
D.
None of the mentioned

Solution:

Answer: b
Explanation: The Grant signal is passed from one device till the other until the device that has requested is found.

QUESTION: 7

In Centralised Arbitration ______ is/are is the BUS master

A.
Processor
B.
DMA controller
C.
Device
D.
Both Processor and DMA controller

Solution:

Answer: d
Explanation: The BUS master is the one that decides which will get the BUS.

QUESTION: 8

Once the BUS is granted to a device ___________

A.
It activates the BUS busy line
B.
Performs the required operation
C.
Raises an interrupt
D.
All of the mentioned

Solution:

Answer: a
Explanation: The BUS busy activated indicates that the BUS is already allocated to a device and is being used.

QUESTION: 9

The BUS busy line is made of ________

A.
Open-drain circuit
B.
Open-collector circuit
C.
EX-Or circuit
D.
Nor circuit

Solution:

QUESTION: 10

After the device completes its operation _____ assumes the control of the BUS.

A.
Another device
B.
Processor
C.
Controller
D.
None of the mentioned

Solution:

Answer: b
Explanation: After the device completes the operation it releases the BUS and the processor takes over it.

QUESTION: 11

The BUS busy line is used

A.
To indicate the processor is busy
B.
To indicate that the BUS master is busy
C.
To indiacate the BUS is already allocated
D.
None of the mentioned

Solution:

QUESTION: 12

Distributed arbitration makes use of ______

A.
BUS master
B.
Processor
C.
Arbitrator
D.
4-bit ID

Solution:

Answer: d
Explanation: The device uses a 4bit ID number and based on this the BUS is allocated.

QUESTION: 13

In Distributed arbitration, the device requesting the BUS ______

A.
Asserts the Start arbitration signal
B.
Sends an interrupt signal
C.
Sends an acknowledge signal
D.
None of the mentioned

Solution:

QUESTION: 14

How is a device selected in Distributed arbitration ?

A.
By NANDing the signals passed on all the 4 lines
B.
By ANDing the signals passed on all the 4 lines
C.
By ORing the signals passed on all the 4 lines
D.
None of the mentioned

Solution:

Answer: c
Explanation: The OR output of all the 4 lines is obtained and the device with the larger value is assigned the BUS.

QUESTION: 15

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

A.
Device A
B.
Device B
C.
Insufficient information
D.
None of the mentioned

Solution:

Answer: b
Explanation: The device Id’s of both the devices are passed on the lines and since the value of B is greater after the Or operation it gets the BUS.

15 Questions MCQ Test Computer Architecture & Organisation (CAO) | Test: Bus Arbitration

To resolve the clash over the access of the system BUS we use ______

The device which is allowed to initiate data transfers on the BUS at any time is called _____

______ BUS arbitration appproach uses the involvement of the processor

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