A bus arbitration scheme with smoothly-distributed waiting time
A shared bus is a frequently-used interconnection channel, to which multiple masters can be connected. It is a single resource which can carry only one transaction at a time. So the protocol of shared buses must include a sequence of operations called arbitration which selects a unique commander. In this paper, we propose a coded self arbitration scheme that provides smoothly-distributed waiting time to all bus masters. In the proposed scheme, when there are more than one request on the shared bus, the bus master with the longest waiting time wins and the bus is allocated to the master. Each bus master requires a ⌈log2 n⌉-bit counter where n is the number of bus masters. And we have evaluated the proposed scheme and compared it with starvationfree arbitration schemes studied so far. According to our simulation, the proposed scheme shows the best distribution of waiting time reguardless of bus request rates.
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