USB in a NutShell - Chapter 1 - Introduction
                
                Now lets face it, (1) most of us are here to develop USB peripherals and (2) it's common to read a standard and still have no idea how to implement a device. So in the next 7 chapters we focus on the relevant parts needed to develop a USB device. This allows you to grab a grasp of USB and its issues allowing you to further research the issues specific to your application.
                
                    Mon 29 Aug 2011 08:49:39 PM CEST - permalink - 
                
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http://www.beyondlogic.org/usbnutshell/usb1.shtml