多通道LVDS的实现及传输错误处理

低电压差分信号LVDS是下一代通讯协议采用的数据传输形式．结合并行RapidIO协议的实现给出了用CPLD器件及VHDL语言实现多通道LVDS的方法；详细讨论了多数据通道高速数据传输时由于时钟一数据错位和数据线闯延迟差异引起的传输错误；对这种传输错误处理有几种解决方案，论文采用4位通道对齐器消除4位以内的传输错误，给出了通道对齐器的实现方法及仿真波形；在RapidIO协议验证板上验证了多通道LVDS数据传输的实现方法，并通过实验测得8位并行LVDS的数据传输率可达300MB／秒，实验表明多通道LVDS实现简单，抗干扰能力强．

Multi-Channel LVDS and Transmission Error Handling

ow voltage differential signal, or LVDS, is adopted by the next-generation communication protocol, such as RapidlO interconnect. In this paper, the method to implement the multi-channel LVDS using CPLD device and VHDL language is presented first. All sorts of transmission error, which are generated during the process of high-speed data transportation due to clock-data skew and difference between transmission lines, are also discussed in detail. A logical component, 4-bit-channel aligner is devised and simulated to solve this sort of transmission error. Finally an evaluation board of RapidIO are devised, on which multi-channel LVDS is implemented. The transmission ratio of 8-bit parallel LVDS on this hoard is up to 300MBps.Many experiments demonstrate that multi-channel LVDS has perfect character of high transportation ratio, easy implementation, and high EMIF.