USB2.0
USB2.0 in terms of speed, high speed or HS, 480 Mbps (megabits per second),USB3.010 times faster than USB 2. Ultra high speed or SS, 4.8 Gbps (gigabit per second).In the instruction method, the USB2.0 polling mechanism can send or receive data (half duplex), USB3.0 asynchronous mechanism, that can send and receive data simultaneously (Quan Shuanggong).In terms of power supply, USB2.0 up to 500mA, USB3.0 up to 900 ma. Allow better power saving with idle state power. More devices can be powered from a central power supply.In terms of the number of wires in the cable, USB2.0 has 4 wires, USB3.0 has 9 wires. In terms of the maximum length of the cable, the maximum length of 5 meters USB2.0, USB3.0 maximum length of 3 meters.
USB 3.0
USB3.0 released in November 2008, USB 2 released nearly eight years later.
USB 3.0 is the second revision of USB (Universal Serial Bus), USB 3.0 supports full duplex, has several more contacts than USB 2.0, and uses a send list block for data packets. USB 3.0 tentative power supply standard is 900mA, and theoretically has the potential to support fiber transmission.USB 3.0 is designed to be compatible with USB 2.0 and USB 1.1, and uses three levels of multi-layer power management technology to provide different power management solutions for different devices. Intel’s xHCI has been able to support USB3.0 interface, and backward compatible with USB2.0 interface.
USB 3.0 uses a new packet routing technology, the cable designed eight internal lines, in addition to VBus and GND as a power supply line, the remaining three pairs of data transmission lines which retained the D + and D compatible with USB 2.0 Of the line, the new SSRX and SST X specifically for the new version of the line.
USB3.0 advantages and highlights far beyond the USB2.0.Improved the utilization of the bus and added new features to allow a device to asynchronously notify the host it prepared.In many ways has been further promoted.USB 3.0 compatible with USB 2.0. However, USB 3 products will be implemented in the same level of USB 2 products, so the speed and power consumption advantages will not be fully realized.
USB 3 can be used for the purpose of USB 2 compatible downward. But USB 2 will always be 2, because it does not have the physical structure of the above said that the two pairs of Super High Speed line, can not be carried out at a rate of 3 to communicate.
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