USB version
1>USB 1.0
USB 1.0: Released in January 1996.
The specified data transmission rate is 1.5 Mbit/s (Low-Speed) and 12 Mbit/s (Full-Speed). No prediction and pass detection function. Only a very small number of such devices are on the market.
USB 1.1: Released in September 1998.
Amended the issues found in version 1.0, mostly about USB Hubs. The earliest revision adopted.
2>USB 2.0
USB 2.0: Released in April 2000.
Increased data transfer rate of 480 Mbit/s (now known as Hi-Speed). USB specification further improved by Engineering Change Notices (ECN).
Mini-B Connector ECN: Released in October 2000.
Specification of the Mini-B plug and socket standard. Be careful not to confuse with Micro-B plugs and sockets.
Errata as of December 2000: Released in December 2000.
Pull-up/Pull-down Resistors ECN: Released in May 2002.
Errata as of May 2002: released in May 2002.
Interface Associations ECN: Released in May 2003.
Add new descriptors to associate multiple interfaces in a single device function.
Rounded Chamfer ECN: Released in October 2003.
A Proposal, Compatibility Improvement for Ruggedness of Mini-B Interfaces
3>USB 3.0
USB 3.0 connector
USB 3.0 supports full-duplex, with five new contacts, two data outputs, two data inputs, and a send list section for data packeting. The new contacts will be side by side at the current four contacts. rear. The tentative power supply standard of USB 3.0 is 900mA, and it will support optical fiber transmission. The designed "Super Speed" transmission speed is 5Gbit/s. If the use of optical fiber can reach 25Gbit/s. The USB 3.0 design is compatible with USB 2.0 and USB 1.1 versions, and uses a three-level multi-layer power management technology to provide different power management solutions for different devices. Intel's xHCI can already support USB3.0 interface, downward compatible with USB2.0 interface. USB 3.0 adopts new packet routing transmission technology. The cable is designed with 8 internal lines. Except for VBus and GND as power supply lines, the remaining 3 pairs are data transmission lines, and D+ and D- are reserved. Lines, SSRX and SSTX have been added specifically for the new version of the line. The USB 3.0 A interface continues to use the same dimensions as the previous version, except that the internal contacts have changed.
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Post time: Apr-18-2018