针对星载总线的测试特点,本文设计了一种基于FPGA多通道总线转换器,实现了USB接口与CAN、三线、RS485、RS422接口复合类型总线的数据交互,同时实现了总线数据长度的自由配置。本文从转换器的硬件构成、PC端的数据封装、FPGA设计思路几个方面对系统进行介绍。设计方案分别通过了基于ModelSim和硬件测试平台的验证,验证结果表明,该方案功能正确,性能良好,可为后续星载总线测试工作提供参考。

The multi-channel bus convertor based on FPGA has been designed to match the characterstic of onboard bus test.The multi-channel bus converter has achieved the function of communication between USB, CAN bus, RS485 bus, RS422 bus and three line bus and cofiguration of bus data length.This paper has introduced the hardware compostion, data encapsulation and software design of the converter.The design has been verified by ModelSim and hardware device, the result of the verification indicates that system is implemented correctly with high performance, and informs the design of future missions and instruments.