Universal Serial Bus 3.0
INFINITE POSSIBILITIES!
USB stands for Universal Serial Bus Provides an expandable, fast, bi-directional, low
cost, hot pluggable Plug and Play serial hardware interface
Allows users to connect a wide variety of peripherals to a computer and have them automatically configured and ready to use
Implemented to provide a replacement for legacy ports to make the addition of peripheral devices quick and easy for the end user
What is USB ?
A Brief History of USB
Creators, Goal
Who created USB ?USB was created by USB Implementers Forum
(USB-IF) in 1996. And Developed and standardized by a group of leading companies from the computer and electronics industries in 1995
Unify— To replace the multitude of connectors
at the back of PCs Plug and Play—without the need for physical
device configuration, or user intervention in resolving resource conflicts.
Hot Swapping—allowing devices to be connected and disconnected without rebooting the computer or turning off the device.
Goal of USB
Evolution
USB 1.0 USB 3.0
USB 1.0(1996) & 1.1(1998)
USB 2.0(2000)
USB 3.0 is 10x faster
The next generation of USB hardware and
specifications is USB 3.0 Version was announced by Pat Gelsinger at
the Intel Developer Forum in September 2007 USB 3.0 Promoter Group announced in
November 2008
USB Now
Comparision
Speed
Power
Characteristic SuperSpeed USB USB 2.0Data Rate SuperSpeed (5.0 Gbps) low-speed (1.5
Mbps), full-speed (12 Mbps), and high-speed (480 Mbps)
Data Interface Dual-simplex, four-wire differential signaling separate from USB 2.0 signaling Simultaneous bi-directional data flows
Half-duplex two-wire differential signaling Unidirectional data flow with negotiated directional bus transitions
Cable signal count Six: Four for SuperSpeed data path Two for non-SuperSpeed data path
Two: Two for low-speed/full-speed/high-speed data path
Bus transaction protocol
Host directed, asynchronous traffic flow. Packet traffic is explicitly routed .
Host directed, polled traffic flow.Packet traffic is broadcast to all devices.
Data transfer types
USB 2.0 types with SuperSpeed constraints. Bulk has streams capability (refer to Section 3.2.8)
Four data transfer types: control, bulk, Interrupt, and Isochronous
Types with Pinout
How is it so fast ?
Pin Configuration
Cable cross-section
Architecture
USB 3.0 Contributors
Thank You