Replacing MOST automotive Ethernet to Gbit / s

Automotive Ethernet (Ethernet) is bullish. Automotive Ethernet is taking advantage of its light weight, low price, high frequency bandwidth and other advantages. It is rapidly attacking the market in the automotive network market. Brand car manufacturers such as BMW and Hyundai have been competing to adopt it and are expected to replace the media-oriented system. Transmission (MOST) technology has become the mainstream technology of vehicle entertainment system transmission network.

Chen Weijun, general manager of Broadcom Taiwan, said that as the amount of data in the car is getting higher and higher, the driver's demand for transmission bandwidth is also increasing. However, too many cables will cause the car's weight burden and fuel consumption to change. High, and the cost of the whole vehicle is rising, and various challenges have prompted auto manufacturers to start looking for a lower-cost line configuration method.

Although Ethernet initially appeared in industrial, consumer electronics and other application fields, it has only officially entered the automotive application market since 2011, but automotive Ethernet currently provides 100Mbit / s transmission bandwidth, and because it uses a star network (Star Network) can ensure that each line has a fixed bandwidth, and each end point can reach a total bandwidth of 1Gbit / s through a bridge switch (Switch).

Not only that, automotive Ethernet can also provide redundancy (Redundancy) function of mechanical failure, to ensure the smooth operation of vehicle-mounted telematics systems. In contrast, although MOST has a bandwidth of 50 to 150 Mbit / s, if audio and navigation equipment such as audio and navigation equipment are operating at the same time, MOST bandwidth will be divided. Therefore, MOST may face insufficient bandwidth and in-vehicle audio and video in the era of high-definition audio and video. The device represents the dilemma of "Kaka".

Chen Weijun pointed out that Broadcom is optimistic about the development potential of automotive Ethernet and has launched BroadR-Reach technology, which uses a single unshielded twisted pair design and uses two-line Ethernet to treat four-line low-voltage differential signaling (LVDS) systems. Effectively reducing the cost of cables by 80% and the weight of 30%, it has become increasingly popular with car manufacturers.

It is understood that the physical layer (PHY) chip and bridge switch of Broadcom BroadR-Reach have been adopted by BMW and Hyundai Motors. It is expected that new cars with Ethernet system will be released in 2014. Chen Weijun said that at present BroadR-Reach has become the industry common standard (De Facto Standard), and Broadcom will not only sell BroadR-Reach silicon intellectual property (IP) to the industry, in the future will promote BroadR-Reach to move behind the scenes of automotive Ethernet Pushing hands-the final automotive Ethernet standard certified by the OPEN Alliance (One Pair Ethernet Alliance).

Looking to the future, in order to meet the transmission requirements of automotive safety image systems, automotive Ethernet has moved towards a single line transmission bandwidth of 1Gbit / s. At present, the International Institute of Electrical and Electronics Engineers (IEEE) has begun to develop the 802.3bp (RTPGE) standard. After the draft is released, it is expected that Ethernet will further strengthen its power in the automotive network market.

It is worth noting that the OPEN alliance has become more and more powerful recently. Chip manufacturers and brand car manufacturers have joined the alliance successively. In addition to Broadcom, NXP, Freescale, Renesas Electronics, BMW, Hyundai Motor, Nissan, etc. are all Promoter members of the OPEN alliance, while General Motors (GM), Ford, Volvo, etc. have all become Adopter members of the alliance, predicting the future Ethernet will become a popular technology adopted by major car manufacturers, and the market performance will become more and more dazzling.

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