USB 3.0 is a USB specification, which was initiated by Intel and other companies. It has been renamed as USB 3.1 Gen 1 by USB IF.
USB 2.0 has been widely recognized by PC manufacturers, and the interface has become a necessary interface for hardware manufacturers.
The maximum transmission bandwidth of USB2.0 is 480mbps (60MB / s), while that of USB3.0 is as high as 5.0gbps (500MB / s).
Please note that 5GB / s bandwidth is not 625mb / s obtained by dividing 5GB / s by 8. Instead, it adopts the same 10 bit transmission mode as SATA (a pair of error correction codes are added on the basis of USB2.0), so its full speed is only 500MB / s.
However, we should note that this is the theoretical transmission value. If several devices share a USB channel, the main control chip will allocate and control the bandwidth available to each device. For example, in USB1.1, all devices can only share 1.5mb/s bandwidth. If a single device takes up all the bandwidth of USB interface, it will bring difficulties to other devices.
working principle:
The reason why USB 3.0 has the performance of “speeding” is entirely due to the improvement of technology.
Compared with USB 2.0 interface, USB 3.0 adds more physical buses in parallel mode.
You can pick up a USB cable and look at the interface.
On the basis of the original 4-wire structure (power supply, ground wire, 2 pieces of data), USB 3.0 adds 4 lines for receiving and transmitting signals.
So there are eight lines in the cable and on the interface.
It is the additional 4 (2 pairs) of lines that provide the bandwidth required for “superspeed USB” to achieve “over speed”.
Obviously, two (1 pair) lines on USB 2.0 are not enough.
In addition, in the signal transmission method, the host control mode is still used, but the asynchronous transmission is changed.
USB 3.0 makes use of two-way data transmission mode instead of half duplex mode in USB 2.0 era. In short, data only needs to flow in one direction, which simplifies the time consumption caused by waiting.
In fact, USB 3.0 does not take any rarely heard of advanced technology, but theoretically increases the bandwidth by 10 times. As a result, it is more friendly and friendly. Once superspeed USB products come out, more people can easily accept and make better customized products.
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