Learn USB Protocol

4.Advantages

  1. Ease of Use  
    • One interface for many devices
    • Hot pluggable
    • Automatic configuration
    • No power supply required
    • Devices can pull up to 500 mA from the bus
  2. Reliability
    • Lossless data transfers
  3. Speed 
    • Three transfer speeds
      • Low Speed – 1.5 Mbps (USB 1.1 and 2.0)
      • Full Speed – 12 Mbps (USB 1.1 and 2.0)
      • Hi-Speed – 480 Mbps (USB 2.0 only)
  4. Low Power Consumption
    • Suspend mode
      • Devices consume 500 uA or less (USB 2.0)
      • Devices consume 2.5 mA or less (USB 3.0)
  5. Availability
    • Microsoft and Intel’s PC 2001 System Design Guide requires that all new PC’s have two useraccessible USB ports
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