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USB - PowerPoint PPT Presentation

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USB. Universal Serial Bus. Most popular Serial Peripheral bus WWW.USB.ORG. SERIAL. Bit after bit after bit instead of several bits at once Referenced as M b ps (why?). Universal SERIAL Bus. Anything to do with serial transmission was traditionally difficult to set up

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Slide1 l.jpg


Universal Serial Bus

Serial l.jpg

  • Bit after bit after bit instead of several bits at once

  • Referenced as Mbps (why?)

Universal serial bus l.jpg
Universal SERIAL Bus

  • Anything to do with serial transmission was traditionally difficult to set up

    … because of start, stop and handshaking

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Hot Swappable

  • USB is hot swappable or hot pluggable

    ------ PnP = Plug and Play

  • You can connect it without opening the machine

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How ?

  • A USB Host Controller should be included in the chipset

  • The USB host controller allows for the use of just one IRQ

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USB 1.0

  • Low Speed

  • Announced November 1995

  • Released January 1996

  • 1.5 Mbps

Usb 1 1 l.jpg
USB 1.1

  • Full Speed

  • December 1998

  • Adopted by Windows 98

  • 12 Mbps

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USB 2.0

  • High Speed

  • 2000

  • 480 Mbps

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USB 3.0

  • Superspeed

  • 4.8 Gbps to 5 Gbps approx

  • mid-2008 announcement, but not yet globally available

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USB Speeds

  • Superspeed – 4.8Gbps to approx 5Gbps

  • High Speed - 480Mbps

  • Full Speed - 12Mbps

  • Low Speed - 1.5Mbps

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USB Connectors

  • Type A

  • Type B

  • Mini Type A

  • Mini Type B

  • Micro USB (Jan 2007)

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USB Type A

Type A sockets will typically be on hosts and hubs

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USB Type B Plug and Receptacle

Type B plugs are on devices.

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Micro USB

Micro USB Vs Mini USB on new RAZR2 cell phoner released May 2007

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Max length of a USB Cable ?

  • 5 Meters for Hi-speed USB ( 16 feet & 5 inches)

  • 3 Meters for Full-Speed USB (9 feet & 10 inches)

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Feet from meters ?

  • Multiply by approx 3.3

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Does your system support USB ? Which one ?

  • Hi-Speed USB ?

  • Open Device Manager & expand the Universal Serial Bus section.

    => There should be an "Enhanced" USB host controller present.

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USB Driver updates ?

  • Keep current with your OS

  • Go to TOUCHSTONE software and use the free scan

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Windows Support for USB

  • Windows 95 OSR 2.1 was the first Windows OS to support USB

  • Windows 98, 2K and XP support USB

  • Windows XP supports high speed USB with a service pack

  • Windows NT never supported USB

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For USB to work …

  • A motherboard or expansion card that supports USB

  • An OS that supports USB

  • A USB device

  • The USB device’s drivers

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  • First introduced by Apple Computer

  • Mid 1980’s Apple engineers developed a method of transferring data between the hard drives in a Mac – they called it firewire.

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Some differences between firewire and usb l.jpg
Some differences between Firewire and USB?

  • Firewire started off at speeds of 100 Mbps +.

  • Firewire was not intended for slower peripherals like mice and keyboards

  • Firewire can connect up to 63 devices in daisy chain, USB can connect up to 127 devices in daisy chain

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  • Both are Serial bus standards

  • Both are hot-swappable / hot-pluggable

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Firewire Standards

  • 1394a : also known as Firewire 400

    Supports speeds of up to 400 Mbps

  • 1394b : also known as Firewire 800

    Supports speeds of up to 800 Mbps

    A newer FireWire standard that supports data

    transmission at up to 3.2 Gbps is now being developed.

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IEEE 1394a

  • Firewire (Apple name)

  • i.Link (Sony name)

  • Lynx

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How do you know if Firewire is supported by your motherboard ?

  • Open Device Manager and check for the 1394 Bus Controller as an installed device

  • None present ?

    - Expansion Card

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No Firewire Ports ? ?

  • Install an adapter card

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Firewire Connectors ? ?

  • 1394a : 4 pin and 6 pin

  • 1394b : 9 pin

    Cables and Connectors

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Firewire Max Cable Length ?

  • Maximum cable length device to device for 1394a (Firewire 400) is 4.5-meters (14.85ft).

  • 10 meter (32ft) cable with a hub/repeater extends FireWire over longer distances.

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Firewire Max Cable Length ?

  • Maximum cable length device to device for 1394b (Firewire 800) is 100 Meters (328 feet)

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Assignment ?

  • Use this link : USB Vs Firewire

    .. to describe the differences between USB and Firewire

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3 Related Terms ?

  • Asynchronous

  • Synchronous

  • Isochronous

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Synchronous ?

Happens on a clock signal

Happens after a definite time quantum

Asynchronous l.jpg
Asynchronous ?

happens at irregular intervals, without the use of a clock signal

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Examples of synchronous and asynchronous communications ?

  • Telephone conversation – asynchronous

  • Transmission of files – could be asynchronous or synchronous

  • Transmission of a definite preset amount of data at a time - Synchronous

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Key ?

  • Synchronous transmission is rigid, asynchronous transmission is flexible

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Isochronous ?

  • Does not operate independently of time like asynchronous communictaions, so needs time coordination - but is not as rigid as synchronous communications

  • Data is transferred consistently and at a steady rate, but in step with the receiving device’s ability to accept the data.

Example of isochronous communications l.jpg
Example of isochronous communications ?

  • A picture going from a peripheral device like a camera, to a computer

  • A video stream going from a camcorder to a computer

What type of interface is used for this l.jpg
What type of interface is used for this ? ?

  • USB

  • Firewire

    Both use isochronous transfer methods