Ethernet AVB chip comes with protocol stack

Ethernet AVB chip comes with protocol stack

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By Christoph Hammerschmidt

The audio endpoint controller connects infotainment devices in vehicles such as loudspeakers, amplifiers, microphones, navigation systems or radio tuners with Ethernet AVB. The chip with the type designation LAN9360 connects audio between Ethernet AVB and the local audio interfaces Inter-IC Sound (I2S), Time Division Multiplexing (TDM) and Pulse Density Modulation (PDM). It supports audio transmission over Ethernet AVB, including gPTP (generalised Precision Time Protocol), time stamping, transport protocols and content protection with HDCP (High Bandwidth Digital Content Protection). It also supports secure booting and secure remote updates over Ethernet. Unlike other Ethernet bridging network solutions that require third-party SoC microcontrollers and software stacks, the LAN9360 does not require additional separate software, allowing designers to easily and quickly configure the device for manufacturers’ unique audio and networking requirements.

The LAN9360 has been validated to IEEE 802.1BA-2011, IEEE 802.1AS, IEEE1722 and IEEE1733 specifications for Ethernet networking and certified to AVB interoperability and reliability standards set by the Avnu Alliance Consortium. The device expands Microchip’s Ethernet offering; other Microchip automotive Ethernet devices include the LAN8770 100BASE-T1 PHY, a low-cost IEEE 802.3bw-2015 single-port PHY transceiver that provides 100 Mbps transmit and receive performance over a single unshielded twisted-pair (UTP) cable. In addition, the Trust Anchor (TA100), a Secure Element from Microchip’s range of CryptoAutomotive security ICs for automotive security applications, provides support for code authentication, secure booting and audio content protection with HDCP.

A development board and Microchip’s MPLAB Network Creator are available for configuring the LAN9360 via a graphical user interface (GUI). This allows developers to quickly and intuitively create configuration files for the LAN9360 AVB audio endpoint and remotely perform full firmware or configuration updates for it via Ethernet.

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