Design Q&A: Multimedia Car Network
What is the network technology used in automotive space?
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Automotive networks typically include a network hierarchy, starting with the Local Interconnect Network (LIN), the Controller Area Network (CAN), and FlexRay for system control and multimedia such as IDB-1394 and Media Oriented System Transport (MOST). The internet.
There are significant differences in network speed (see attached table). LIN supports up to 20 kbits/s, CAN supports up to 1 Mbit/s, whereas FlexRay supports 10 Mbits/s. It is also more reliable and flexible, and it offers enhanced payload support.
Multimedia-enabled buses have higher bandwidth. MOST25 has 25 Mbits/s, MOST50 has 50 Mbits/s, and IDB-1394 provides 400 Mbits/s. 1394 technology provides higher bandwidth for consumer applications, and it promises to make automotive applications ultra-high bandwidth in the near future.
What are the advantages of a tiered approach?
The tiered approach facilitates optimization of applications with multiple needs. For example, LIN is suitable for implementations of low-cost applications that typically require drivers to initiate functions. These applications are usually performed independently in a closed area and do not require the network to communicate with other functions. Examples include side mirrors, window controls, and sun visors.
The upper layer of LIN, usually CAN, is for applications that need to communicate with other electronic control units (ECUs). A good example is the dashboard, which collects information about the changing health of a car from multiple modules.
Highly reliable communication between ECUs is also very important, which requires CAN's solid network management system. Due to its high reliability, FlexRay is expected to be the upper or partial replacement of CAN for CAN. FlexRay is 10 times faster than CAN and offers a rich network topology for enhanced reliability. At the same time, FlexRay provides more nodes in the network.
What services does a multimedia network usually provide?
Multimedia network application requirements are primarily from personal entertainment applications, similar to those on airplanes. It needs to support a wide range of devices, from a variety of audio (terrestrial, satellite, CD) and video (DVD, cable, satellite TV navigation screen) devices to live video data from car TV cameras and personal data devices ( Games, MP3 players, multimedia players).
The multimedia network is also suitable to assist the driver's needs. Possible applications include live camera network data such as assisted parking, car parking, blind spot cameras, or visually enhanced cameras for low visibility conditions such as night or fog.
What is the difference between multimedia network technologies?
The IDB-1394 and MOST systems are for similar applications, the most significant difference being the data rate. IDB-1394 can support 400 Mbits/s or higher, and MOST is limited to 50 Mbits/s. IDB-1394 is also very flexible and supports a variety of network topologies, including buses, trees, rings or stars. MOST mainly supports only ring topology.
What is the relationship between IDB-1394 and IEEE 1394?
IDB-1394 and IEEE-1394 are transparent. The 1394TA and IDB Forums jointly define automotive requirements based on the IEEE-1394 standard.
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