ARM Architecture - Bus Architecture
Consider a system using round-robin bus arbitration among 3 devices: D1, D2, and D3. If D1 currently has the bus, which device will get the bus next?
Consider a system using round-robin bus arbitration among 3 devices: D1, D2, and D3. If D1 currently has the bus, which device will get the bus next?
medium📝 Analysis Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Understand round-robin arbitration order
Round-robin gives bus access in a fixed cyclic order among devices.Step 2: Determine next device after D1
After D1, the next device in order is D2.Final Answer:
D2 -> Option BQuick Check:
Round-robin cycles D1 -> D2 -> D3 = B [OK]
Quick Trick: Round-robin cycles devices in order, next after D1 is D2 [OK]
Common Mistakes:
- Assuming same device keeps bus repeatedly
- Thinking bus stays idle between devices
- Confusing round-robin with priority arbitration
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