Introduction to USB 2.0

USB (Universal Serial Bus 2.0, Universal Serial Bus) is a new interface technology applied in the computer field. The USB interface has the characteristics of faster transmission speed, support for hot plugging and connection of multiple devices. It has been widely used in various external devices. There are four (five) types of USB interfaces: USB1.1, USB2.0, USB3.0 and USB3.1 (3.1Gen 1 and 3.1Gen 2). Theoretically, the transmission speed of USB1.1 can reach 12Mbps, while the speed of USB2.0 can reach 480Mbps, and it can be backward compatible with USB1.1. As early as 1995, there have been personal computers with USB ports, but due to the lack of software and hardware support, the USB ports of these personal computers are unused. After 1998, with Microsoft's built-in support module for the USB interface in Windows 98, and the increasing number of USB devices, the USB interface gradually entered the practical stage. In recent years, with the popularization of a large number of personal computers that support USB, it has become a general trend that USB has gradually become the standard interface of personal computers. On the host side, almost 100% of the latest PCs support USB; on the peripheral side, more and more devices use USB interfaces, such as digital cameras, scanners, joysticks, tapes and floppy drives, imaging devices, printers, keyboards, mice and many more.