Inter-device communication with a pulse-amplitude modulation (PAM) signal can have at least two data eyes with different Vref levels. A physical interface (PHY) can be trained for the PAM signal by training a first data eye separately from the second data eye. The training can include adjusting the first Vref level separately from the second Vref level to center each reference voltage on its respective data eye.

The present invention discloses a USB signal output circuit having reverse current prevention mechanism. A switch circuit turns on when a switch control terminal receives a first high level voltage to output a signal from a signal input terminal to a signal output terminal. A first voltage pull-low circuit includes a passive-component high-pass filter circuit and a discharging circuit. The passive-component high-pass filter circuit couples an output terminal voltage of the signal output terminal to a pull-low control terminal. The discharging circuit turns on when a voltage of the pull-low control terminal is larger than a predetermined voltage level to discharge the switch control terminal to pull the switch control terminal to a second high level voltage. A second voltage pull-low circuit pulls the switch control terminal to a low level voltage when the output terminal voltage is larger than a reference voltage and does not have a glitch.

A virtual image display system, including a handheld electronic device having a first battery and a virtual image display having a second battery, is provided. The handheld electronic device and the virtual image display are coupled to each other. The handheld electronic device is used to calculate a power supply time of the first battery; calculate an expected discharge time of the second battery under a discharge condition; compare the power supply time and the expected discharge time to generate a comparison result; and adjust a supply current provided by the first battery to the virtual image display according to the comparison result.

A combined data/power coupling device includes a chassis having first and second powering device connectors and a powered device connector each coupled to a data/power coupling subsystem. The data/power coupling subsystem configures each of the first and second powering device connectors to receive power from at least one powering device, configures the first powering device connector to receive data from the at least one powering device, and provides data and power received via the first powering device connector to a powered device via the powered device connector. When the data/power coupling subsystem determines that data and power are not available via the first powering device connector, it configures the second powering device connector to receive data from the at least one powering device, and provides data and power received via the second powering device connector to the powered device via the powered device connector.

Monitoring and reporting methods and apparatus include the acquisition of detailed aircraft state and systems data, analysis of the collected data, and transmission of the collected data and/or analysis of the collected data to a destination automatically via a portable electronic device which is carried onto and off of the aircraft by the pilot or another crew member. More particularly, monitoring and reporting methods and apparatus include collecting analog or digital sensor data onboard an aircraft, analyzing the data in real-time, and automatically transmitting the data and/or analysis of the data to a destination including a portable storage device such as a portable computer, electronic flight bag (EFB), or smart phone, by means such as wireless transmission, for automatic transfer to another destination when the portable computer, electronic flight bag (EFB), or smart phone is off of the aircraft.

This application discloses a wireless keyboard. The wireless keyboard includes a connection portion. The connection portion includes an accommodating cavity with an opening at an end and used for accommodating an electronic stylus. A wireless charging coil is arranged in the accommodating cavity. A charging interface and a wireless charging control module are arranged in the wireless keyboard. The wireless charging control module is connected to the charging interface and the wireless charging coil. The charging interface can receive a direct current signal. The wireless charging control module can convert, if it is detected that a direct current signal is inputted to the charging interface, the direct current signal into an alternating current signal and transmit the alternating current signal to the wireless charging coil. The wireless charging coil generates an alternating electromagnetic field in response to the alternating current signal, to wirelessly charge the electronic stylus.

A storage unit is disclosed. The storage unit may include an interface to a host and storage for a data. A receiver may receive from a host a boot power data. The boot power data may including a first power level and a duration. A circuit may boot the storage unit based at least in part on the boot power data. The storage unit may include a second power level, with the first power level greater than the second power level.

A data processing system may include a storage device configured to: transmit, to an exterior, prediction information, for each power mode, that indicates a predicted time for performing a background operation for managing a memory device; and perform the background operation in an idle state of the storage device by switching to a corresponding power mode in response to a power mode control signal that is received in the idle state; and a control device configured to: determine a power mode of the storage device and an idle time for the idle state during which the background operation is performed based on the prediction information; transmit the power mode control signal to the storage device; and suspend, during the idle time, execution of a command processing request transmitted to the storage device.

A data storage system including a docking station, and a dockable external data storage device operates in an underwater environment. The dockable external data storage device includes a housing, a memory disposed within the housing to store data, and a connector assembly mounted on the housing. The connector assembly includes at least one optical transmitter configured to transfer data from the memory to a corresponding optical receiver in the docking station. The connector assembly also includes a self-passivating electrical contact configured to transfer electrical power to the dockable external data storage device from a corresponding power contact in the docking station.

The present disclosure provides a mechanism for data transfer for a robot using pre-existing network standards (e.g., USB-C, Thunderbolt, CAN-bus, or Ethernet) and for power delivery, both being implemented through direct contact pins on a robot and the corresponding contact pads on a docking station. The robot can be a legged or wheeled ground vehicle, an aerial vehicle such as a drone, an underwater robot, or any other suitable robots. The docking station may include a computing device, to which the robot can transfer data. The contact pins and pads can be arranged to have a rotational symmetry.