Microchip Technology Inc.

John Junling Zang

Dixon Chen

Venkatraman Iyer

Shivanand I Akkihal

Yanzi Xu

Hongming An

Henry Liang

Kevin Yang

Jiachi Yu

Venkat Iyer

Michael Rentschler

James Ho

Congqing Xiong

Various embodiments relate to detecting a cable fault within a network. A method may include transmitting a pulse signal to a cable of a shared bus from a node, and observing a signal received at the node in response to the pulse signal. The method may also include determining a fault condition of the cable based on the pulse signal and on an amplitude of each sample of a number of samples of the one or more observed signals.

Diagnosing cable faults within a network

On or more examples relate, generally, to an apparatus that includes a reconciliation sublayer of a physical layer, a reduced media independent interface (RMII) of the physical layer, and a logic circuit. Such a logic circuit may operate to receive a changed carrier sense signal provided by the reconciliation sublayer, generate a further changed carrier sense signal at least partially responsive to a prediction that the changed carrier sense signal would cause unintended signaling at the RMII, and provide the further changed carrier sense signal to the RMII.

Changing carrier sense signal generated by a reconciliation sublayer of a physical layer that may cause unintended signaling at a reduced media independent interface (RMII)

Disclosed embodiments relate, generally, to improved data reception handling at a physical layer. Some embodiments relate to end of line systems that include legacy media access control (MAC) devices and PHY devices that implement improved data reception handling disclosed herein. The improved data reception handling improves the operation of legacy systems, and the MAC more specifically, and in some cases to comply with media access tuning protocols implemented at the physical layer.

Physical layer to link layer interface and related systems, methods and devices

Described is a digital interface and related systems, method and devices. In some embodiments, an interface may be an interface between a link layer and a physical transmission medium. The interface may be configured for a bit rate and/or reference clock that limits electromagnetic emissions (EME), for example, as compared to a bit rate and/or clock rate specified by interfaces widely used in industry.

Ethernet interface and related systems, methods and devices

Disclosed embodiments relate, generally, to improved data reception handling at a physical layer (PHY). Some embodiments relate to end of line systems that include legacy media access control (MAC) and PHY that implement improved data reception handling disclosed herein. The improved data reception handling improves the operation of the end of line systems, and the MAC more specifically, and in some cases to comply with media access tuning protocols implemented at the physical layer.

Various embodiments relate to detecting collisions on a communication network. A method may include transmitting a first signal to a shared bus. The method may also include observing a second signal at the shared bus during the transmitting. Further, the method may include detecting a collision on the shared bus in response to an amplitude of the second signal being one of greater than a first threshold and less than a second threshold.

Detecting collisions on a network

Disclosed are systems and devices for interfacing media access tuning circuitry that implements collision handling or traffic shaping with a reduced media independent interface (RMII). In some embodiments, an interface circuitry manages emulated signals generated by a media access tuning circuitry in response to detecting that the emulated signals would cause incorrect operation of an RMII. Also disclosed is a physical layer (PHY) device for a multidrop network. In some embodiments the PHY device implements physical layer collision techniques and operable to communicate with a media access control (MAC) device via an RMII, where the MAC is configured for carrier-sense multiple access (CSMA), CSMA with collision detection (CSMA/CD), or CSMA with collision avoidance (CSMA/CA). Also disclosed are processes for managing signaling at a PHY that implements physical layer collision avoidance (PLCA) or traffic shaping, as the case may be.

Interface for improved media access, and related systems, methods, and devices

Various embodiments relate to wired local area networks. A method may include detecting, at a node in a wired local area network, at least one event. A physical layer device of the network node is configured to implement a physical level collision avoidance (PLCA) sublayer. The at least one event may include at least one of an amount of data stored in a first-in-first-out (FIFO) buffer of the node being at least a threshold amount, and a received packet being a precision time protocol (PTP) packet incurring variable delay. The method may further include emulating a collision at the node in response to the at least one detected event.

Emulating collisions in wired local area networks and related systems, methods, and devices

Described is a digital interface and related systems, method and devices. In some embodiments an interface may be an interface between a link layer and a physical transmission medium. The interface may be configured for a bit rate and/or reference clock that limits electromagnetic emissions (EME), for example as compared to a bit rate and/or clock rate specified by interfaces widely used in industry.

Ethernet interface and related systems methods and devices

Various embodiments relate to detecting a cable fault within a 10SPE network. A method may include transmitting a pulse signal to a cable of a shared bus from a node, and observing a signal received at the node in response to the pulse signal. The method may also include determining a fault condition of the cable based on the pulse signal and on an amplitude of each sample of a number of samples of the one or more observed signals.

Circuitry of a physical layer for interfacing with a communication bus of a wired local area network is disclosed. The circuitry includes a variable delay driver operably coupled to a communication bus. The communication bus includes a shared transmission medium. The variable delay driver is configured to control a slew rate of a driven transmit signal at the driver output. The circuitry also includes receiver circuitry operably coupled to the communication bus. The circuitry further includes a common mode dimmer operably coupled to the receiver circuitry and the communication bus. The common mode dimmer is configured to protect the receiver circuitry from common mode interference.

Transceiver and driver architecture with low emission and high interference tolerance

An apparatus includes an encoder circuit and a scrambler circuit configured to receive a frame, the frame including a preamble and a payload. The scrambler circuit is further configured to scramble contents of the frame including the payload and at least a portion of the preamble, provide synchronization information with results of scrambling the contents, and send results of scrambling the contents to the encoder circuit.

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Guangdong, China

John Junling Zang