CTC: An End-to-End Flow Control Protocol for Multi-Core Systems-on-Chip

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Executive Summary

The authors propose Connection Then Credits (CTC) as a new end-to-end flow control protocol to handle message-dependent deadlocks in Networks-on-Chip (NoC) for multi-core systems-on-chip. CTC is based on the classic end-to-end credit-based flow control protocol but differs from it because it uses a network interface micro-architecture where a single credit counter and a single input data queue are shared among all possible communications. This architectural simplification reduces the area occupation of the network interfaces and increases their design reuse: for instance, the same network interface can be used to connect a core independently of the number of incoming and outgoing communications.

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