[Solved] In a system with 4 devices sharing a bus, a new arbitrati... If device D2 has the highest priority but was just granted the bus, which device should get the bus next if D2 requests again immediately? | ARM Architecture

ARM Architecture - Bus Architecture

In a system with 4 devices sharing a bus, a new arbitration method combines priority and round-robin. If device D2 has the highest priority but was just granted the bus, which device should get the bus next if D2 requests again immediately?

ABus remains idle until D2 releases

BD2 again immediately

CDevice with lowest priority

DNext device in round-robin order after D2

Step-by-Step Solution

Solution:

Step 1: Understand combined arbitration method
The method uses priority to select devices but applies round-robin fairness among same priority devices.
Step 2: Apply round-robin after immediate grant
Since D2 just had the bus, even if it requests again, the next device in round-robin order gets the bus to ensure fairness.
Final Answer:
Next device in round-robin order after D2 -> Option D
Quick Check:
Priority + round-robin fairness = next device after D2 = A [OK]

Quick Trick: After immediate grant, round-robin moves to next device [OK]

Common Mistakes:

Assuming same device gets bus repeatedly ignoring fairness
Choosing lowest priority device without reason
Thinking bus stays idle unnecessarily

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More ARM Architecture Quizzes

If device D2 has the highest priority but was just granted the bus, which device should get the bus next if D2 requests again immediately?

Step 1: Understand combined arbitration method

Step 2: Apply round-robin after immediate grant

Final Answer:

Quick Check:

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