USB (UniversalSerialBus) is an external bus standard and a technical specification for input and output interfaces. It is widely used in information communication products such as computers and mobile devices.
Do you know the development history of USB?
USB 1.0 appeared in January 1996 with a speed of 1.5Mb/s.
Upgraded to USB 1.1 with a speed of 12Mb/s in September 1998. USB1.1 is a more common USB specification, the transmission rate of its high-speed mode is 12Mbps, and the transmission rate of the low-speed mode is 1.5Mbps.
In April 2000, the USB1.1 specification evolved into the USB2.0 specification. In USB 2.0, "Enhanced Host Controller Interface" (EHCI) defines an architecture compatible with USB 1.1. That is, USB 2.0 drivers can drive USB 1.1 devices, and those devices that support USB 1.1 can be used directly on the USB 2.0 interface. Not only that, USB cables, plugs and other accessories can also be used directly. The USB 2.0 standard interface speed is 480Mbps, which is 20 times the speed of ordinary USB, which greatly reduces the transmission time of printing files.
In November 2008, a new generation of interface standard, namely USB3.0, was jointly formulated by industry giants such as Intel, Microsoft, Hewlett-Packard, Texas Instruments, NEC, ST-NXP and so on. Its physical layer adopts 8b/10b encoding method, the theoretical speed is 5.0Gb/s, and the actual value is 50% of the theoretical value, which is close to 10 times of USB 2.0. It can be widely used in computers and consumer electronic products.
The USB 3.1 specification was released in December 2013, which is divided into two versions, Gen 1 and Gen 2. However, USB 3.1 is not supported downwards, and an adapter is required.
In summary, since the USB V0.7 version was jointly published by Intel, Compaq, IBM, Microsoft and other companies on November 11, 1994, the USB version has experienced years of development and has developed into version 3.1. In theory, the USB interface can be used to connect up to 127 peripherals, such as mice, keyboards, modems, mobile phones, smart wearables and other electronic products. USB has become one of the necessary interfaces for computers and a large number of smart devices in the 21st century.
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