高速数据传输中，同步接口对时序一致性要求随速率的提高而严格，实现难度也随之增加，尤其是速率可变的传输设备，设备复杂度增加，可靠性也面临考验。为此提出了利用异步串行接口（ASI）接收数据流方法，通过对恒定速率有效带宽分配和时钟抖动优化等关键技术设计，给出了采用一级时钟变换实现可变速率数据可靠传输的实现方案，并对设计电路的时钟抖动性能进行了测试分析。经工程应用，该接口传输速率可达270Mbps.%In high-speed data transmission, it need accurate time schedule for high speed data with the synchronous interface. It becomes more difficult to implement during the increasing of rate, especially for rate changeable transmission equipment. Therefore, a method to reliably transmit rate changeable data is given by receiving data source through ASI interface. Based on design of such key technologies as efficient bandwidth assignment for rate invariable transmission and optimization of time jitter, this paper describes the scheme for high speed transmission with ASI interface and switching grade-A clock. The experiment result shows that the time jitter of the system is reduced, and the interface can achieve the maximum transfer rate of 270 Mbps.
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