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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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Universal Serial Bus

  • Bit after bit after bit instead of several bits at once
  • Referenced as Mbps (why?)
universal serial bus
Universal SERIAL Bus
  • Anything to do with serial transmission was traditionally difficult to set up

… because of start, stop and handshaking

hot swappable
Hot Swappable
  • USB is hot swappable or hot pluggable

------ PnP = Plug and Play

  • You can connect it without opening the machine
How ?
  • A USB Host Controller should be included in the chipset
  • The USB host controller allows for the use of just one IRQ
usb 1 0
USB 1.0
  • Low Speed
  • Announced November 1995
  • Released January 1996
  • 1.5 Mbps
usb 1 1
USB 1.1
  • Full Speed
  • December 1998
  • Adopted by Windows 98
  • 12 Mbps
usb 2 0
USB 2.0
  • High Speed
  • 2000
  • 480 Mbps
usb 3 0
USB 3.0
  • Superspeed
  • 4.8 Gbps to 5 Gbps approx
  • mid-2008 announcement, but not yet globally available
USB Speeds
  • Superspeed – 4.8Gbps to approx 5Gbps
  • High Speed - 480Mbps
  • Full Speed - 12Mbps
  • Low Speed - 1.5Mbps
usb connectors
USB Connectors
  • Type A
  • Type B
  • Mini Type A
  • Mini Type B
  • Micro USB (Jan 2007)
usb type a
USB Type A

Type A sockets will typically be on hosts and hubs

usb type b plug and receptacle
USB Type B Plug and Receptacle

Type B plugs are on devices.

micro usb
Micro USB

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

max length of a usb cable
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)
feet from meters
Feet from meters ?
  • Multiply by approx 3.3
does your system support usb which one
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.

usb driver updates
USB Driver updates ?
  • Keep current with your OS
  • Go to TOUCHSTONE software and use the free scan
windows support for usb
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
for usb to work
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
  • 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.
Apple brought Firewire to the IEEE
  • IEEE released it as standard IEEE 1394 in December 1995
some differences between firewire and usb
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
  • Both are Serial bus standards
  • Both are hot-swappable / hot-pluggable
firewire standards
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.

ieee 1394a
IEEE 1394a
  • Firewire (Apple name)
  • i.Link (Sony name)
  • Lynx
how do you know if firewire is supported by your motherboard
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

no firewire ports
No Firewire Ports ?
  • Install an adapter card
firewire connectors
Firewire Connectors ?
  • 1394a : 4 pin and 6 pin
  • 1394b : 9 pin

Cables and Connectors

firewire max cable length
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.
firewire max cable length43
Firewire Max Cable Length
  • Maximum cable length device to device for 1394b (Firewire 800) is 100 Meters (328 feet)
  • Use this link : USB Vs Firewire

.. to describe the differences between USB and Firewire

3 related terms
3 Related Terms
  • Asynchronous
  • Synchronous
  • Isochronous

Happens on a clock signal

Happens after a definite time quantum


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

examples of synchronous and asynchronous communications
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
  • Synchronous transmission is rigid, asynchronous transmission is flexible
  • 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
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
What type of interface is used for this ?
  • USB
  • Firewire

Both use isochronous transfer methods