USB interface
Release time:
2021-12-08
The full name of USB is Universal Serial Bus, and the Chinese meaning is "Universal Serial Bus". USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies at the end of 1994. USB supports hot plug and press, and its plug and play advantages make it the most important interface method for computers [3].
The USB interface has 4 pins, namely USB power supply (usually 5V), USB data line, USB data line and ground [3].
USB has two specifications, namely USBI. 1 and USB2.0 [3].
USBI. The transmission rate of 1 high-speed mode is 12 Mbit/s, the transmission rate of low-speed mode is 1.5Mbit/s,1 Mb/s = 8 Mbit/s,12 Mbit/s = l .5 MB/s [3].
The USB2.0 specification is developed by USBI. 1 specification evolved. Its transmission rate reached 480Mbit/s, converted to MB for 60 MB/s, enough to meet the rate requirements of most peripherals. The enhanced host controller interface (EHCI) in USB2.0 defines an architecture compatible with USB1.1, which can drive USB with USB2.0 driver. 1 equipment. In other words, all devices that support USB1.1 can be used directly on the USB2.0 interface without worrying about compatibility issues, and accessories such as USB cables and plugs can also be used directly [3].
The USB2.0 standard further increases the interface rate to 480Mbit/s, which greatly shortens the transmission time of video and audio files in LCD color TV [3].
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