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  2. ACPI - Wikipedia

    en.wikipedia.org/wiki/ACPI

    The device states D0–D3 are device dependent: D0 or Fully On is the operating state. As with S0ix, Intel has D0ix states for intermediate levels on the SoC. [37] D1 and D2 are intermediate power-states whose definition varies by device. D3: The D3 state is further divided into D3 Hot (has auxiliary power), and D3 Cold (no power provided):

  3. USB - Wikipedia

    en.wikipedia.org/wiki/USB

    This section describes the power distribution model of USB that existed before Power-Delivery (USB-PD). On devices that do not use PD, USB provides up to 7.5 W through Type-A and Type-B connectors, and up to 15 W through USB-C. All pre-PD USB power is provided at 5 V. For a host providing power to devices, USB has a concept of the unit load ...

  4. Active State Power Management - Wikipedia

    en.wikipedia.org/wiki/Active_State_Power_Management

    Active-state power management (ASPM) is a power management mechanism for PCI Express devices to garner power savings while otherwise in a fully active state. Predominantly, this is achieved through active-state link power management; i.e., the PCI Express serial link is powered down when there is no traffic across it.

  5. USB hardware - Wikipedia

    en.wikipedia.org/wiki/USB_hardware

    To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4.75 V, 4.4 V, and 4.35 V respectively by USB 2.0 for low-power devices, [a] but must be at least 4.75 V at all locations for high-power [b] devices (however, high-power devices are required to operate as a low-powered device so that they ...

  6. USB communications - Wikipedia

    en.wikipedia.org/wiki/USB_communications

    Reset USB device to a known initial state. SE0 ≥ 2.5 ms Suspend Power down the device, such that it would only consume 0.5 mA from V BUS. Exits this state only after a resume or reset signal is received. To avoid this state a SOF packet (high speed) or a keep alive (low speed) signal is given. J ≥ 3 ms Resume (host)

  7. USB mass storage device class - Wikipedia

    en.wikipedia.org/wiki/USB_mass_storage_device_class

    The USB mass storage device class (also known as USB MSC or UMS) is a set of computing communications protocols, specifically a USB Device Class, defined by the USB Implementers Forum that makes a USB device accessible to a host computing device and enables file transfers between the host and the USB device. To a host, the USB device acts as an ...

  8. USB On-The-Go - Wikipedia

    en.wikipedia.org/wiki/USB_On-The-Go

    The USB OTG and Embedded Host Supplement to the USB 2.0 specification introduced three new communication protocols: . Attach Detection Protocol (ADP): Allows an OTG device, embedded host or USB device to determine attachment status in the absence of power on the USB bus, enabling both insertion-based behavior and the capability to display attachment status.

  9. USB 3.0 - Wikipedia

    en.wikipedia.org/wiki/USB_3.0

    As with earlier versions of USB, USB 3.0 provides power at 5 volts nominal. The available current for low-power (one unit load) SuperSpeed devices is 150 mA, an increase from the 100 mA defined in USB 2.0. For high-power SuperSpeed devices, the limit is six unit loads or 900 mA (4.5 W)—almost twice USB 2.0's 500 mA.

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