本文的内容是从概念上介绍USB软驱固件设计的各个步骤，这些步骤中的重点在于USB设备的枚举，Mass Storage CBI协议/UFI命令的处理以及本设计中所采用的DataFlash AT45DB161B的读写。-the content of the paper is to introduce the concept of USB floppy drive firmware design of the various steps These steps will focus on the USB device enumeration. Mass Storage CBI agreements / UFI order processing and the design used by the DataF lash AT45DB161B literacy.