Finally, with consideration for the all-electric powertrains of the future, the Energy Efficient Ethernet (EEE) standard IEEE 802.3az2010 provides mechanisms for putting nodes into standby, leaving receive circuitry in a mode that enables reception of a wake-up message.
Automotive Ethernet as a peripheral, or as a stand-alone solution
Automotive Ethernet will find itself in one of three clear application spaces; the large central ECU on the central data backbone, in a domain controller, or in an end node application. In the first two cases, Automotive Ethernet is ideally implemented using a suitable peripheral device to complement the selected high-performance SoC. The third case is typically the domain of a smaller 32-bit MCU that can bridge the balance between cost and sufficient performance.
With the introduction of the TC9562 there is a single-chip solution that can support both peripheral functionality and operation as a stand-alone Automotive Ethernet node (Figure 2). Large SoCs are supported via the PCI express (PCIe) interface and it includes L1 low-power mode support when required. 6 channels of DMA are also provided that can be used to automatically filter incoming data according to IP address and transfer them into the DRAM of the host SoC (Figure 3). The Ethernet MAC supports all common media-independent interfaces (MII) including serial gigabit (SGMII).
Alternatively, the device can also be used as a stand-alone Ethernet node solution by making use of the integrated Arm® Cortex®-M3 processor. Operating at up to 187.5 MHz, and with access to up to 320 kB of memory, this makes it ideal for implementing audio amplifiers, audio systems, and interfacing with cellular network modems (Figure 4).