方案概述
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Driver Assistance with MOST: Powerful Network Infrastructure for DAS
Cameras are the key to many modern automotive applications like surround-view and lane departure warning. Depending onthe application and the number of cameras, one or more video signals need to be transported to a control unit for display
and/or signal processing. Digital video transmission with low latency is essential to match the application requirements.
The MOST network has been designed from the beginning as time-division-multiplex network to provide data transmission
with minimum latency and premium quality of service. In a multi-camera application, the cameras are synchronized via theMOST network to sample the video frames at exactly the same time with low jitter. MOST transports streaming data— like
high definition video—as well as control data and packet data over the same cable. The MOST network controls eachcamera, and a camera back channel is implicitly supported by the nature of MOST. Additional data—such as parameterlists, camera settings and/or accompanying image information—can be sent to the control unit as packet data.
In addition to cameras, various sensors within the car can be networked with MOST to allow for central and/or de-centralsensor data fusion. MOST can be used with an electrical and/or optical physical layer and with a variety of topology options
including ring, star, daisy-chair, double ring or even with a mixture of topologies. This flexibility and the ability to easilycreate seamlessly connected clusters support the implementation of redundancy systems.
MOST delivers a functional system model to enable a scalable, modular and expandable driver assistance system design
based on interchangeable and common sensors and control units.
Technical Key Benefi ts
■ Real time data transfer: digital high defi nition videotransmission with ultra-low latency
■ Highest quality of service
■ Flexible topologies: star, daisy chain, ring andany combination
■ Automotive proven coax physical layer: full duplex andpower over cable supported
■ Synchronized devices
■ Wide range of data types: streaming, control, packetand IP over one cable
■ Remote control
■ Single-chip solution for lean camera nodes
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