Analyze The ''USB'' Interface

- Oct 09, 2017 -

USB is the abbreviation of Universal Serial Bus in English, which means "Universal Serial Bus". It is not a new bus standard, but a new type of interface technology used in the PC world. As early as 1995, PCS had USB ports, but the USB ports of these PCS were unused due to a lack of software and hardware support. After 1998, with Microsoft's built-in support module for USB ports and a growing number of USB devices in Windows 98, the USB interface gradually entered the practical phase.
USB USES a 4 pin plug as the standard plug. By using this standard plug, all peripherals can be connected by the chrysanthemum chain form, without loss of bandwidth. USB standard is divided into five parts: controller, controller driver, USB chip driver, USB device and customer driver for different USB devices.
USB requires the support of the host hardware, operating system and peripherals to work. At present, the main board is generally used to control the USB function control chip group, and also installed the USB interface slot. The operating system for Windows 98 and above has built-in support for the USB port (but Windows NT does not support USB). There are already digital cameras, digital speakers, scanners, keyboards, mouse and many other USB peripherals.
With the popularity of USB, USB has become the standard interface of PC. The latest PC comes with almost 100 percent support for USB, and devices with USB ports are developing at an alarming rate. We currently use the USB1.1 standard interface, which has a speed of 12Mbps.

USB 2.0 standard
COMPAQ, Hewlett Packard, Intel, Lucent, Microsoft, NEC and PHILIPS have jointly developed the USB 2.0 interface standard. USB 2.0 the speed of data transmission between devices has increased to 480 MBPS, around 40 times faster than USB 1.1 standard, the speed of increase for the user's biggest advantage is that means that the user can use to a more efficient external devices, and has a variety of speed of peripheral devices can be connected to the USB 2.0 lines, unlike USB 1.1 times, because of the high bandwidth makes more devices without having to worry about data transmission bottleneck effect. USB 2.0 can use the same specifications of the same cable in the original USB definition, the specifications of the joints are exactly the same, while maintaining the excellent features of USB 1.1 at high speed, it also guarantees the downward compatibility.

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