Usb And Usb-based High-capacity Memory

Universal Serial Bus (USB) is a new type of external bus. Characteristics such as portable, quick, and flexible make the bus popular. In particular, USB-based Mass Storage devices are used more and more widely. This kind of Mass Storage devices not only make users much more convenient to use, but also greatly improve the speed of storage.This thesis firstly introduces the USB2.0 specification and presents the model of USB drivers. This specification includes all aspects of the USB. This paper gives an in-depth description of the fundamental contents, the architecture, the management of data transfer and communication modes of the USB2.0 specification. After that, the tranfer protocols and command block sets are discussed in detail according to USB Mass Storage class. Lastly, the Philips ISP 1581 controller is analyzed, with features, functions as well as the structure of the chip described and specific applications discussed.