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