基于AVR单片机+FPGA的U盘记录器设计

为了满足某民航导航系统中高速海量数据的存储要求，提出了一种基于AVR单片机和FPGA结合控制的U盘记录器设计方案。设计中以AVR单片机控制CH376读写U盘数据为核心，并利用FPGA控制大容量FLASH作为高速数据的缓存介质，解决了单片机缓存资源匮乏而造成的数据存储不可靠的问题。同时设计了专门的掉电检测电路，在掉电瞬间保存FLASH断点地址，实现了系统再上电的续存功能。经过多次测试与实验表明，系统性能表现优良，工作稳定可靠，能够满足实际工程应用需求，并已成功应用与某民航飞行数据记录系统中。

Design of a U disk recorder based on AVR MCU and FPGA

In order to meet the demand for high speed and mass data in civil aviation navigation system, this paper proposes a design scheme of U disc recorder based on AVR MCU and FPGA . In the design, taking AVR MCU as the core, which control CH376 read and write U disk data. And useing the large-capacity FLASH controled by FPGA as a cache medium for the high speed data, to solve the problem of data storage is not reliable caused by the lack of cache resources of MCU. At the same time, designed a special brown-out detection circuit, and the FLASH breakpoint address is saved at the moment, and realizes the function of the system to continue to store when power on again. After many tests and experiments show that the system has good performance, stable and reliable, and can meet the needs of practical engineering application, and has been successfully applied to a civil aviation flight data recording system.