Methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. In particular, a preamble for transmission in a sequence of symbols over a multi-wire communications interface, such as a MIPI C-PHY interface, is constructed to include one or more symbols each having a single state transition symbols for signaling a particular calibration preamble from a transmitter to a receiver over the multi-wire communications interface. The preamble, having only single state transition symbols, improves reliability of decoding the symbols at a receiver, including reception and decoding without the use of a calibration clock.

A receiver includes: an A/D converter that performs an analog digital conversion of an input signal; an equalizer that equalizes an output from the A/D converter, eliminates inter code interference and obtains a data output; a timing recovery part that generates a recovery clock from the data output of the equalizer; a detector that detects the timing when an input signal varies from a no-signal state and has reached a predetermined threshold; and an initial phase setting part that sets as the initial phase of the recovery clock by the timing recovery part, a timing when the predetermined time has elapsed after the timing detected by the detector.

A receiver includes: an A/D converter that performs an analog digital conversion of an input signal; an equalizer that equalizes an output from the A/D converter, eliminates inter code interference and obtains a data output; a timing recovery part that generates a recovery clock from the data output of the equalizer; a detector that detects the timing when an input signal varies from a no-signal state and has reached a predetermined threshold; and an initial phase setting part that sets as the initial phase of the recovery clock by the timing recovery part, a timing when the predetermined time has elapsed after the timing detected by the detector.

A system and method for a frequency detector circuit includes: a transition detector configured to receive a data input and provide a first edge output based on transitions in the data input; a first circuit configured to generate a second edge output; a second circuit configured to generate a third edge output; and a combinational logic configured to output an UP output when at least two of the first edge output, the second edge output, and the third edge output are high and configured to output a DOWN output when the first edge output, the second edge output, and the third edge output are all low.

A calibration method of an equalizer circuit for a memory storage device is disclosed. The calibration method includes: receiving a first signal; adjusting, by the equalizer circuit, the first signal according to a control parameter to output a second signal; generating a first sampling signal according to a first reference signal and the second signal, wherein the first sampling signal reflects data transmitted by the first signal; and generating a second sampling signal according to a second reference signal and the second signal and adjusting the control parameter according to the second sampling signal to calibrate the equalizer circuit, wherein a voltage value of the first reference signal is different from a voltage value of the second reference signal.

A transmitter 10B always transmits a signal (data in which a dock is embedded) generated by the serializer 11 to the communication link. The receiver 20B includes a recovery circuit 22, a deserializer 23, a selector 25, and a training signal generator 32. The training signal generator 32 generates and outputs a training signal for frequency synchronization of the recovering operation of the recovery circuit 22. The selector 25 receives the signal from the transmitter 10B via the communication link and receives the training signal output from the training signal generator 32. The selector 25 selects and outputs either the received signal or the training signal according to the level of the lock signal output from the recovery circuit 22.

A power supply system that includes a pluggable and replaceable modular power interface card and a separate main chassis component that can include AC to DC power conversion and regulation circuitry, a digital voltage display, and one or more card slots for receiving the power supply card. The modular power interface card can provide power to a network device that is connected thereto. The modular power interface card can include an isolation and protection unit that includes a voltage suppression subunit and a high voltage protection subunit, fusing, and a path to earth ground. The modular power interface card plugs into the main chassis and can be quickly replaced in the event of damage or failure, and can include light emitting diodes (LEDs) to indicate whether the remote device being powered is consuming current, which is useful during troubleshooting.

A power supply system that includes a pluggable and replaceable modular power interface card and a separate main chassis component that can include AC to DC power conversion and regulation circuitry, a digital voltage display, and one or more card slots for receiving the power supply card. The modular power interface card can provide power to a network device that is connected thereto. The modular power interface card can include an isolation and protection unit that includes a voltage suppression subunit and a high voltage protection subunit, fusing, and a path to earth ground. The modular power interface card plugs into the main chassis and can be quickly replaced in the event of damage or failure, and can include light emitting diodes (LEDs) to indicate whether the remote device being powered is consuming current, which is useful during troubleshooting.

Various aspects described herein relate to techniques for synchronization channel design and signaling in wireless communications systems (e.g., a 5th Generation (5G) New Radio (NR) system). In an aspect, a method includes identifying a frequency band supported by a user equipment (UE), identifying one or more frequency locations based on the identified frequency band, and the one or more frequency locations are a subset of synchronization raster points used for synchronization signal transmission. The method further includes searching for at least one synchronization signal based on the one or more identified frequency locations.

Various aspects described herein relate to techniques for synchronization channel design and signaling in wireless communications systems (e.g., a 5th Generation (5G) New Radio (NR) system). In an aspect, a method includes identifying a frequency band supported by a user equipment (UE), identifying one or more frequency locations based on the identified frequency band, and the one or more frequency locations are a subset of synchronization raster points used for synchronization signal transmission. The method further includes searching for at least one synchronization signal based on the one or more identified frequency locations.