- published: 21 Jul 2010
- views: 764191
USB 3.0 is the third major revision of the Universal Serial Bus (USB) standard for computer connectivity. In the late 1990s, the first major revision was made to the USB 1.1 specification. The revision was called USB 2.0 which added a new transfer speed called High Speed (HS – 480 Mbit/s) to the earlier speeds (Low Speed (LS) – 1.5 Mbit/s and Full Speed (FS) – 12 Mbit/s).
The USB 3.0 specification uses the same concepts of USB 2.0 but with many improvements and totally different implementation. Earlier USB concepts like endpoints and four transfer types (bulk, control, isochronous and interrupt) are preserved but the protocol and electrical interface is significantly different. It is so different that the specification defines a physically separate channel to carry USB 3.0 traffic. The changes in this specification make improvements in the following areas:
transfer speed – added a new transfer type called Super Speed or SS – 5 Gb/s (electrically it is more similar to PCIe Gen2 than USB 2.0)
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