Abstract: A transmitting apparatus includes a signal generation circuit and an adjustment circuit. The signal generation circuit is configured to send, to a receiving apparatus, a serial data signal that carries a training sequence and valid data, where the training sequence is used to train a skew or an equalization of the serial data signal, and the valid data is used to detect an amplitude of the serial data signal. The adjustment circuit is configured to receive indication information from the receiving apparatus, and adjust a transmission parameter of the serial data signal based on the indication information, where the transmission parameter includes at least one of the skew, the equalization, or the amplitude.

Abstract: This application provides a data transmission apparatus and a data transmission method. The data transmission apparatus in this application includes: a first connection unit and a control unit, where the first connection unit is a connector plug or a connector socket; and the control unit is configured to: if determining that the first connection unit is in a forward insertion state, control a first data pin pair of the first connection unit to be in a first communication mode, and control a second data pin pair of the first connection unit to be in a second communication mode.

Abstract: An interface circuit, a method for controlling the interface circuit, a chip, and a terminal device are provided. The interface circuit includes a first PMOS transistor, an input signal control circuit, a bias circuit, a signal input end, and an input/output end. The bias circuit includes a substrate bias voltage generation end and a bias voltage generation end. The bias circuit is coupled to a high-level power supply end, the input/output end, and a ground end. The input signal control circuit is connected to the signal input end, the bias voltage generation end, and a gate of the first PMOS transistor; a first electrode of the first PMOS transistor is connected to the high-level power supply end, and a second electrode of the first PMOS transistor is connected to the input/output end.

Abstract: Embodiments of this application provide example interface circuits, example electronic devices, and example data transmission apparatuses. One example interface circuit includes an interface indication end and a data transmission end. The interface circuit performs data transmission with a first device by using the data transmission apparatus. The interface circuit includes the interface indication end and the data transmission end. The interface circuit obtains indication information from an indicator of the data transmission apparatus through the interface indication end. The indication information indicates a data transmission interface protocol of the first device. The interface circuit is configured to transmit data to the first device through the data transmission end based on the data transmission interface protocol of the first device indicated by the indication information.

Abstract: An apparatus with a forward-reverse insertion interface and a detection method are provided, and relate to the field of communication technologies, to improve transmission efficiency of an auxiliary channel. The forward-reverse insertion interface of the apparatus includes: a first auxiliary channel (CH1), including a first switch selection circuit (SW1) coupled to a first node (A); a second auxiliary channel (CH2), including a second switch selection circuit (SW2) coupled to a second node (B), where the second switch selection circuit (SW2) and the first switch selection circuit (SW1) are structurally asymmetrical; and a control circuit (CTRL), configured to control switching of the first switch selection circuit (SW1) to change an electrical parameter of the first node (A), and control switching of the second switch selection circuit (SW2) to change an electrical parameter of the second node (B).

Abstract: This application provides a transmission method, apparatus, and system, to implement bidirectional transmission of an audio/video signal between peer devices. The transmission system may include a first transmission apparatus and a second transmission apparatus, where the first transmission apparatus is connected to the second transmission apparatus through a first cable, and the first cable includes a first number of main downlink lanes and a second number of main uplink lanes. Bidirectional transmission of the audio/video signal between the first transmission apparatus and the second transmission apparatus is performed through the first cable.

Abstract: An operational amplifier, a drive circuit, an interface chip (1201, 1301, 1401, 1501), and an electronic device (1600) relate to the field of power electronics technologies. The operational amplifier includes a first load (R1), a second load (R2), a first switching transistor group (301-1), a second switching transistor group (301-2), and a tail current source (203). The first switching transistor group (301-1) has a first end connected to a first output end (outp) of the operational amplifier and connected to a power supply (VDD) of the operational amplifier by using the first load (R1), and has a second end grounded by using the tail current source (203). The second switching transistor group (301-2) has a first end connected to a second output end (outn) of the operational amplifier.

Abstract: A communication system includes a first device, a second device, and a cable that connects the first device and the second device, and the cable stores cable information of the cable. A link training method includes: obtaining device information of the first device, obtaining the cable information from the cable, and obtaining device information of the second device; and performing link training between the first device and the second device based on the device information of the first device, the cable information, and the device information of the second device.