Digital designers developing computer systems and peripherals with USB applications/technology. It has long been recognized that personal computers (PCs) need to be simpler and easier to use without sacrificing connectivity or expandability. The Universal Serial Bus (USB) was originally developed in 1995 as a low-cost external-expansion bus that makes adding peripherals to a PC as easy as hooking up a telephone to a wall jack. The goal was to create a “Plug and Play” environment. As long as all of the devices adhered to the class definitions then they could be supported by the operating system.