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USB 2.0 Features

Submitted by nestor on Sat, 2005-05-14 04:07.

USB 2.0 specification is 480 Mb/sec, 40 times faster than USB 1.1.

PERFORMANCE

APPLICATIONS

ATTRIBUTES

LOW-SPEED

  • Interactive Devices
  • 10 - 100 kb/s

  • Keyboards, Mouse
  • Stylus
  • Graphics Peripherals
  • Virtual Reality Peripherals
  • Lowest Cost
  • Easy-of-Use
  • Dynamic Attach-Detach
  • Multiple Peripherals

FULL-SPEED
  • Phone, Audio, Compressed Video
  • 500 kb/s - 10 Mb/s
  • POTS
  • Broadband
  • Audio
  • Microphone
  • Lower Cost
  • Easy-of-Use
  • Dynamic Attach-Detach
  • Multiple Peripherals
  • Guaranteed Bandwidth
  • Guaranteed Latency

HIGH-SPEED
  • Video, Storage
  • 25 - 400 Mb/s
  • Video
  • Storage
  • Imaging
  • Broadband
  • Low Cost
  • Easy-of-Use
  • Dynamic Attach-Detach
  • Multiple Peripherals
  • Guaranteed Bandwidth
  • Guaranteed Latency
  • High Bandwidth

Application Space Taxonomy

The USB architecture comprehends four basic types of data transfers:

  • Control Transfers: Used to configure a device at attach time and can be used for other device-specific purposes, including control of other pipes on the device.
  • Bulk Data Transfers: Generated or consumed in relatively large and bursty quantities and have wide dynamic latitude in transmission constraints.
  • Interrupt Data Transfers: Used for timely but reliable delivery of data, for example, characters or coordinates with human-perceptible echo or feedback response characteristics.
  • Isochronous Data Transfers: Occupy a prenegotiated amount of USB bandwidth with a prenegotiated delivery latency. (Also called streaming real time transfers).
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