基于CPLD的USB总线读写控制功能的实现

Implementation of USB bus’Teading and Writing Control Based on CPLD

以CPLD作为主控芯片,设计了一种针对USB总线的数据读写控制器。U盘通过该控制器转接到PC机的USB接口,利用控制器对USB总线上的数据进行实时监测分析,自动禁止PC机上的文件数据输出到U盘,同时不影响PC机对U盘中文件的正常读取。

The design of a reading and writing controller for the USB bus is b^ed on CPLD as a master chiP. U-- disk can connect to the PCts USB pore using this controller, which works for the tea J-time moflitoring and analysing of the USB bus data, and automatically disables the PC outputting it＇ s files data to the U-disk, while the PC does not affect the U-disk＇ s normal file reading.