Datasheet

15
Automotive Capabilities
Driver Assistance with MOST: Powerful Network Infrastructure for ADAS Solutions
Cameras are the key to many modern automotive applications like surround-view and lane departure warning. Depending on
the 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 the
MOST 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 each
camera, and a camera back channel is implicitly supported by the nature of MOST. Additional data—such as parameter
lists, 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-central
sensor 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 easily
create 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 video
transmission with ultra-low latency
■ Highest quality of service
■ Flexible topologies: star, daisy chain, ring and
any combination
■ Automotive proven coax physical layer: full duplex and
power over cable supported
■ Synchronized devices
■ Wide range of data types: streaming, control, packet
and IP over one cable
■ Remote control
■ Single-chip solution for lean camera nodes
Application Example: Top-View (Surround-View)
The example below shows a Top-View Electronic Control Unit (ECU) connected to four high-resolution cameras. Both the camera
links and the link to the head unit are capable of running compressed video of typically 50 Mbits/s up to 150 Mbits/s.
150 Mbps
150 Mbps
Head Unit
Top-View
ECU
Coax
Figure: Top-view diagram
Figure: Top-view application with flexible views—top-view image, dewarped single camera pictures with minimal delay from camera to display
Advanced Driver Assistance Systems