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Documents USB 3.0 General Description and Comparison of USB 3.0 to USB 2.0
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  • Author Author: apatro
  • Date Created: 28 Apr 2010 12:53 PM Date Created
  • Last Updated Last Updated: 7 Oct 2021 4:43 AM
  • Views 4798 views
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USB 3.0 General Description and Comparison of USB 3.0 to USB 2.0

Initially, USB provided two speeds (1.5 Mb/s and 12 Mb/s). As PCs became increasingly powerful and able to process larger amounts of data, users needed to get more and more data into and out their PCs. This led to the definition of USB 2.0 specification to provide a transfer rate of 480 Mb/s while retaining backward compatibility.

 

As technology innovation marches forward, new kinds of devices, media formats, and large inexpensive storage are converging. They require significantly more bus bandwidth to maintain the interactive experience users have come to expect. In addition, user applications demand a higher performance connection between the PC and these increasingly sophisticated peripherals. USB 3.0 SuperSpeed addresses this need by adding an even higher transfer rate to match these new usage and devices.

 

  • SuperSpeed USB 3.0 supports a maximum data rate of 4.8 gigabits per second offering 10x performance increase over Hi-Speed USB (USB 2.0)
  • USB 3.0 is full duplex, meaning it can upload and download simultaneously (it's bi-directional); USB 2.0 is only half duplex
  • Backwards compatibility with USB 2.0 hi-speed devices
  • USB 3.0 has got dual bus architecture means SuperSpeed bus operates concurrently with USB 2.0
  • SuperSpeed USB is a Sync-N-Go technology that minimizes user wait-time.
  • SuperSpeed USB will provide improved power efficiency. No device polling and lower active and idle power requirements
  • USB 3.0 SuperSpeed creates a communication pipeline with host and each device or a "host-directed protocol". The older USB 2.0 Hi-Speed broadcasted packets to all devices.
  • Cable makeup: 2 wires for power and ground, 2 for Hi-Speed backward compatibility, 4 wires for the new Superspeed
  • Shielded differential pair (SDP, twisted or twinax) is needed for USB 3.0. UTP cable used for USB 2.0 can not be used for USB 3.0
  • USB 3.0 cable can be upto 3 meters to maintain SuperSpeed data transfer rates
  • USB 3.0 SuperSpeed can handle more power over its cable. 50% more than USB 2.0
  • USB 3.0 has dual simplex and asynchronous notifications
  • USB 3.0 Standard-A connector has complete compatibility with USB 2.0 Standard-A connector. However, a new receptacle has been created "USB 3.0 Standard-B" which can only accept a USB 3.0 Standard-B device plug.

image

Fig: USB 3.0 Standard-A Connector

 
    Comparison of USB 3.0 to USB 2.0
 
Features
USB 3.0
USB 2.0
Speed
Upto 4.8 Gb/s
upto 480 Mb/s
Signaling
Dual-simplex four wire differential signaling
Two wire differential signaling
Data flow
Full duplex
Half duplex
Power Management
Multi-level which supports idle, sleep, and suspend
Port-level that has two levels of entry/exit latency
Cable types
Shielded differential pair (SDP)
Unshielded twisted pair (UTP)
Cable Wires
8 total
4 total
Traffic Flow
Asynchronous
Polled
Packet Traffic
Explicitly routed
Broadcast to all devices
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  • ngadhia
    ngadhia over 14 years ago

    USB 3.0 IP core and boards are now available.  One can start from the below mentioned links:

     

    IP core: http://www.slscorp.com/pages/ipusb30sls.php

     

    Board: http://www.slscorp.com/pages/usb30db.php

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  • apatro
    apatro over 15 years ago in reply to bheemarao
    Linux kernel is currently supporting USB 3.0. Drivers are under development for Windows 7 and in Windows 8 operating system it will be integrated.
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  • bheemarao
    bheemarao over 15 years ago in reply to apatro
    What operating systems support USB 3.0? and What new applications does USB 3.0 enable?
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  • apatro
    apatro over 15 years ago in reply to bheemarao

    For USB3 controller IC, major suppliers are like TI - http://focus.ti.com/docs/prod/folders/print/tusb1310.html

    Renesas-http://america2.renesas.com/usb/product/upd720200.html

    Fujitu- http://www.fujitsu.com/emea/news/pr/fme_20090727-954.html

    Frescologic - http://www.frescologic.com/news-0_2.html

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  • bheemarao
    bheemarao over 15 years ago

    Hi Anil,

     

    Currently who are the major suppliers for USB-3 in market?

     

    Best Rdgs

    Bheema

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