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FlexRay - In-car Communication Protocol | Cypress Semiconductor

FlexRay - In-car Communication Protocol

 Background |  Overview |  Features |  In-car Communication Protocol |  Target applications |  Data transfer method |  Difference with CAN |  Internal configuration of a node |  Electronic signals |  Bus Guardian |  Topology |  Segment configuration |  Protocol |  Status transition |  Error control |

FlexRay ASSP

In-car communication protocols can be roughly divided into two groups, the first just providing ordinary data transfer and the second providing the media for control functions distributed over several nodes.

  • Information group: Several tens of Mbps to several hundreds of Mbps
  • Control group: Several tens of Kbps to several tens of Mbps

The following figure shows the bit rate comparison of each communication protocol.

 Comparison of bit rates by communication protocols

Comparison of bit rates by communication protocols

Also, the distributed control functions can be divided into several areas of applications depending on the transfer rate.

  • Safety group: Several hundreds of Kbps to about 10 Mbps
  • Body group: Several tens of Kbps to about 1 Mbps

As shown in the above figure, the communication protocols can be classified by the communication speed, and the application for each group can be clarified accordingly.

FlexRay can cover the limit of the communication speed of CAN, and when it comes to reliability, it is the best communication protocol among them.

 Application classes by communication speed

Application classes by communication speed

- Note -

Some parts of this site show only the outlines of the actual FlexRay standards to make them easily understood.