By John Garney et al.
Desk of contents: advent; phrases and Abbreviations; heritage; Architectural assessment; USB info movement version; Mechanical; electric; Protocol Layer; USB gadget Framework; USB Host: and software program; Hub Speification; Appendix A: Transaction Examples; Appendix B: instance Declarations for country Machines; Appendix C: Reset Protocol nation Diagrams; Index.
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Extra info for UNIVERSAL SERIAL BUS SPECIFICATION
2 Power Management A USB host may have a power management system that is independent of the USB. The USB System Software interacts with the host’s power management system to handle system power events such as suspend or resume. Additionally, USB devices typically implement additional power management features that allow them to be power managed by system software. The power distribution and power management features of the USB allow it to be designed into powersensitive systems such as battery-based notebook computers.
The detailed format of this information varies, depending on the device class of the device. For a complete discussion of USB devices, refer to Chapter 9. Physical Device Function USB Logical Device USB Bus Interface Actual communications flow Logical communications flow Figure 5-4. 3 Physical Bus Topology Devices on the USB are physically connected to the host via a tiered star topology, as illustrated in Figure 5-5. USB attachment points are provided by a special class of USB device known as a hub.
2 Removal of USB Devices When a USB device has been removed from one of a hub’s ports, the hub disables the port and provides an indication of device removal to the host The removal indication is then handled by appropriate USB System Software. If the removed USB device is a hub, the USB System Software must handle the removal of both the hub and of all of the USB devices that were previously attached to the system through the hub. 3 Bus Enumeration Bus enumeration is the activity that identifies and assigns unique addresses to devices attached to a bus.