基于FPGA的多接口PCM传输系统的设计

摘要

In telemetry systems,in order to solve the problems that single-interface test system is not universal, and the application conditions are limited comparatively ,a multi-interface data transmission system using FPGA as control core was designed. The system transmits frame synchronization signals and the shift pulse signals through the RS422 interface meanwhile receiving PCM code ,communicates with the host computer by serial inter⁃face USB and parallel interface PCI ,and then read PCM data and analysis. PCI interface using a single access combined with burst access data transfer mode,USB interface adopts the FT245 with integrated agreement. The long-term tests prove that the system work stably and transmitted reliably with good genarality ,which meets the re⁃quirements of design.%遥测系统中，为解决PCM传输系统单一接口通用性不强、应用条件局限的问题，设计了一种以FPGA为控制核心的多接口数据传输系统，该系统通过RS422接口发送帧同步信号和移位脉冲信号并接收PCM码，以USB串行接口和PCI并行接口与上位机进行通信，读取PCM数据并分析。设计中PCI接口采用单次访问结合突发访问的数据传输模式，USB采用具有完整协议的FT245。长期试验证明：该系统工作稳定可靠，数据传输无误，通用性强，满足设计要求。