Due to the development of multimedia technology, there is a higher demand for the data transfer rate between the peripheral and the host, so the USB bus technology came into being. USB (Universal Serial Bus), translated into Chinese is Universal Serial Bus, it supports the connection between various PCs and peripherals, and can also realize digital multimedia integration.
The main features of the USB interface are: plug and play, hot-swappable. The USB connector combines a wide variety of peripheral I/O ports into one, making it hot-pluggable, with auto-configuration capabilities, and the user simply plugs the peripheral into a bus other than the PC, and the PC can Automatically identify and configure USB devices. Moreover, the bandwidth is larger, and there is no need to add an interface card in the PC when adding peripherals. Multiple USB hubs can transmit data to each other, so that the PC can control the peripherals in a new way. USB can automatically detect and install peripherals for true plug and play. Another notable feature of USB is that it supports "hot" plugging, which means that a USB device can be inserted or unplugged on a running computer without shutting down and powering off. Over time, USB will become standard in PCs. Peripherals based on USB will gradually increase, and now the peripherals that meet USB requirements are: modem, keyboard, mouse, CD-ROM, gamepad , floppy drive, scanner, etc., while the number of peripherals that are not independent I/O connections will gradually decrease.
That is, the number of host-controlled peripherals is reduced, and the number of intelligently-controlled peripherals is increased. After the USB bus standard was upgraded from version 1.1 to version 2.0, the transmission rate increased from 12Mbps to 240Mbps, and the connection distance increased from 5 meters to nearly 100 meters after replacing the medium. Based on this, USB can also do ISDN and video-based products. A digitizer such as a data glove provides a data interface. The USB bus has a simple structure, and the signal definition only consists of 2 power lines and 2 signal lines.
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