A Directed Flow Control for Real-Time SCIThe IEEE Standard 1596-1992 Scalable Coherent Interface (SCI) provides a ring-based network protocol with the logical operation of a bus. The high throughputs and low latencies associated with SCI make it a desirable platform for real-time networking applications. Several methods have been proposed to add priority-based, real-time capabilities to SCI. The Preemptive Priority Queue protocol uses a node-oriented scheme to enforce priorities, while the TRAIN protocol takes a ring-oriented arbitration approach. This paper introduces a hybrid protocol named Directed Flow Control that combines node- and ring-oriented flow control to yield greater performance. A functional comparison of the three protocols is presented followed by performance results obtained through high-fidelity modeling and simulation.
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