USB2.0 interface is a half-duplex structure, that is, thedata transmission is only one-way. First, the peripheral sends a signal to thecomputer, the computer received the signal, send another signal to theperipheral device. and both of them cannot exchange information at the same time.
USB3.0 has its own dedicated data path, dedicated datatransmission lines and independent data receiving lines. Therefore,the datacommunication between the host and peripherals can achieve full-duplex.
Usb3.0 transmission speed is ten times faster than USB 2.0,USB 2.0 transfer rate of 480 Mbps, and USB 3.0 is 4.8 Gbps. Of course, manydevices do not need such a high rate, But hard drives and card readers andother equipment still require fast transmission speed. Compared with USB 2.0,USB 3.0 is more energy efficient. In addition, USB 3.0 is backward compatiblewith USB 2.0 devices.
USB2.0 specification definition is very bad, various types ofUSB2.0 interface is very much, and it's form is very confusing.
USB3.0 available, to bring us not only un side producttransmission speed of the upgrade and the development of the industry has alsoplayed a role in fueling. Implement a common USB interface。
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