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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
Correct answer is option 'C'. Can you explain this answer?
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How is a device selected in Distributed arbitration ?a)By NANDing the ...
Answer: c
Explanation: The OR output of all the 4 lines is obtained and the device with the larger value is assigned the BUS.
Explanation: The OR output of all the 4 lines is obtained and the device with the larger value is assigned the BUS.
Most Upvoted Answer
How is a device selected in Distributed arbitration ?a)By NANDing the ...
Understanding Distributed Arbitration
Distributed arbitration is a method used in computer networks and multi-processor systems to manage access to shared resources. It ensures that multiple devices can communicate without conflicts.
How Device Selection Works
In distributed arbitration, the selection of a device for resource access is done through logical operations on the signals sent by the devices.
Why Option C is Correct
- Signal Transmission: Each device in the network sends a signal indicating its intent to access the resource.
- ORing the Signals: The selection process involves performing a logical OR operation on the signals received from all participating devices. This means that if at least one device wants access, the result will be true (or high).
- Conflict Resolution: The ORing allows the system to recognize any active requests without needing to identify which specific device is requesting access. This is crucial in distributed systems where multiple devices might want to access the same resource simultaneously.
Why Other Options Are Incorrect
- NANDing Signals (Option A): This would result in a device being selected only if all signals are low, which is counterproductive for arbitration.
- ANDing Signals (Option B): This would only result in a high signal if all devices are requesting access, which is unlikely and not suitable for arbitration.
- None of the Mentioned (Option D): As explained, the correct mechanism is indeed ORing the signals.
Conclusion
In summary, distributed arbitration utilizes the OR operation on device signals to effectively manage resource access, ensuring that the system responds to any device request efficiently.
Distributed arbitration is a method used in computer networks and multi-processor systems to manage access to shared resources. It ensures that multiple devices can communicate without conflicts.
How Device Selection Works
In distributed arbitration, the selection of a device for resource access is done through logical operations on the signals sent by the devices.
Why Option C is Correct
- Signal Transmission: Each device in the network sends a signal indicating its intent to access the resource.
- ORing the Signals: The selection process involves performing a logical OR operation on the signals received from all participating devices. This means that if at least one device wants access, the result will be true (or high).
- Conflict Resolution: The ORing allows the system to recognize any active requests without needing to identify which specific device is requesting access. This is crucial in distributed systems where multiple devices might want to access the same resource simultaneously.
Why Other Options Are Incorrect
- NANDing Signals (Option A): This would result in a device being selected only if all signals are low, which is counterproductive for arbitration.
- ANDing Signals (Option B): This would only result in a high signal if all devices are requesting access, which is unlikely and not suitable for arbitration.
- None of the Mentioned (Option D): As explained, the correct mechanism is indeed ORing the signals.
Conclusion
In summary, distributed arbitration utilizes the OR operation on device signals to effectively manage resource access, ensuring that the system responds to any device request efficiently.
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How is a device selected in Distributed arbitration ?a)By NANDing the signals passed on all the 4 linesb)By ANDing the signals passed on all the 4 linesc)By ORing the signals passed on all the 4 linesd)None of the mentionedCorrect answer is option 'C'. Can you explain this answer?
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