Usb Bus System Research And Development, Master And Slave

The Universal Serial Bus (USB) is specified to be an new industry standard extension to the PC architecture. It was developed by a coalition of PC industry companies. USB is a serial cable bus that supports data exchange between a host computer and a wide range of simultaneously accessible peripherals. It comes with l.SMbps and 12Mbps(USB 1.1) transfer rate and can support a maximum of 127 devices. Also,USB devices support PnP (plug n play) and Hot plug,which makes it easy to use.As USB transfer rate is faster compared to serial or parallel port,new device are starting built based on USB interface,such as LAN,keyboard,mouse,joystick,CD-ROM,FDD,printer,scanner,digital camera etc. USB 2.0 specification extends the transfer speed from 12Mbps to 480Mbps,which is exactly 40 times of USB 1.0 or USB 1.1. It is necessary to study the architecture and the development method of this new bus.In this paper,the architecture and features of USB,including the bus attributes,the protocol definition,types of transactions,power management will be described firstly. It tries to give developers and users a snapshot of USB. Secondly,the thesis discusses the development method of the USB bus:in chapter 3,the USB embedded host controller development will be described,using SL811HS chip;the USB slave development will be described in the next chapter,using EZ-USB chipset. All these chips are supplied by the Cypress Semiconductor Corporation. At last,a summary will be presented as the end of the thesis.