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Self-synchronized vector transfer for high speed parallel systems

Communications between processing elements (PEs) in high speed parallel systems become a bottleneck as the function and speed of the PEs improve continuously. Clocked I/O ports in PEs may malfunction if data read failure occurs due to clock skew. To reduce the clock skew, global clock distribution is utilized, however it seems to be more difficult to use this for high speed parallel systems in the future. This paper addresses a self-tested self-synchronization (STSS) method for vector transfer between PEs. A test signal is added to remove the data read failure. This method has these features: high data throughput; low power consumption; no constraints on clock skew and system scale; flexibility in design; less latency. A failure zone concept is used to characterize the behavior of storage elements. Using a jitter injected test signal, robust vector transfer between PEs with arbitrary clock phases is achieved without global synchronization.