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 US