Universal Serial Bus (Universal Serial Bus; USB) has become the hottest portable digital consumer electronics products priority interconnection (interconnect) standard. But USB's History history is full of twists and turns, the major manufacturers to fill of the Wintel cooperation profound lessons from selfishness against each other, they can give the backward intentionally "He can be replaced by some food for thought and reflection? Outside of the PC's output into the peripheral devices are low-speed devices such as keyboard, mouse, scanner and monitor low-level resolution, serial and parallel cascaded ports be able to meet. The peripherals quality (resolution, and data transfer speed, etc.) and the amount of the 1990s (an increase in the number of peripheral devices) simultaneously enhancing the existing interface connection has been unable to meet the demand.In 1994, Intel, Compaq, NEC, Digital, Northern, IBM, Microsoft and other seven companies set up the USB-IF (USB Implementers Forum), the name suggests is mutually agreed between the series with the the PC peripherals goal established organizationsand January 15, 1996, led by an Intel USB1.0 interface chipset formalized standards. Intel's leading development led USB1.0 host controller, but it refused to disclose the open internal details of the register set of specifications called the Universal Host Controller Interface (Universal Host Controller Interface-UHCI)), so Microsoft, Compaq,national Semiconductor (National Semiconductor) jointly developed called "open Host Controller Interface" (Open Host Controller Interface-OHCI) register set with them tit for tat.And the PC97 specifications of this year Microsoft set, deliberately will IEEE1394 and USB1.0 function achieving the same built-interface standard force the following year, Intel had to follow the position in 2000 will begin to follow the 1394; same time in JuneMicrosoft more strategic alliances and Compaq 1394 peripherals link method ---- Device Bay. Therefore murky due to competition in the state by 1394 with USB1.0 specifications lead to the development of the market drivers time subsequent delay, hence make peripherals meet USB1.0 specification delays began to appear on the market after 1998. On the other hand, the consumer electronics industry for 1394 look forward to working with Intel conflicting industry hope that 1394 transmission speed of at least want to upgrade to 1.6Gbps in order to meet the future needs of bandwidth expansion, so take the initiative to increase the 1394 R & D efforts, and even threatened not conduciveIntel emphasis on the single PC specifications within the short-term market segmentation strategy.Moreover, the the 1394 patent largest owners, Apple, requirements levied a $ 1 royalty per unit 1394 port after to calm industry outrage, and jointly set up by Apple, Compaq, Philips, Toshiba, Sony and Panasonic authorized in February 1999management company, changed to levy $ .25 ways to solve, Intel simply live on their own but do not want to be controlled by others to promote USB2.0 plan.At this juncture Intel to completely abandon the 1394 and a soft spot for USB1.X thus upgrade USB2.0 motives, but is aware connected 1394a all peripherals necessary control over the PC, Intel both PC core Intel dominate the surroundingthe right to control will be challenged, this is not Intel would like to see, resulting in R & D without routing through a PC peripherals via USB2.0 can mutually linked to a positive force. So Developer Forum in the spring of 1999 (Intel Developer Forum; IDF), Intel asked the support 480Mbps high-speed USB 2.0 version of the plan, April 27, 2000 the USB2.0 Edition officially announced, supporters addition to the originalCompaq, Intel, Microsoft, and NEC, together with HP, Lucent and Philips. To avoid making the same mistakes, Intel is willing to provide free register set of "strengthen the Host Controller Interface" (Enhanced Host Controller Interface-EHCI) specification details, Microsoft also promised that at the end of 2000 in the new version of Windows XP with support USB2.0.This also means that all the USB2.0 host controller IC will use the same register set, not only favorable USB2.0 peripheral device driver software development, to lay the foundation for such a high-speed (High-Speed​​) USB USB IF recognized commonstandard foundation, and began to follow the widely favored by all kinds of PC peripherals manufacturers and digital consumer electronics industry.