CAN Protocols
CAN FD Protocol
CAN FD (CAN with Flexible Data-rate) was introduced by Bosch in 2012 to overcome the Classical CAN's bit rate limitation to 1 Mbps and to expand the number of data bytes per CAN frame from up to 8 to up to 64, thereby closing the gap between Classical CAN and other protocols. This is achieved by a modified CAN frame format where the bit rate can be switched to faster value inside the CAN frame and by a new data length coding.
CAN FD is standardized as ISO11898-1:2015. CAN FD protocol controllers are also able to perform Classical CAN communication.
CAN FD Light Protocol
CAN FD Light is a lightweight version of CAN FD. It is intended for low cost application with one master controller and numerous slave controller.
CAN FD Light is currently intended for 1 Mbps. For a CAN FD Light slave there is no need for an external crystal to have lower cost.
CAN FD Light is currently being standardized by the CiA (CAN in Automation).
Existing CAN FD IP can be used as CAN FD Light commander (master).
CAN XL Protocol
CAN XL (Controller Area Network with Extended Length) provides a superior solution for data rates of at least 10Mbit/s by maintaining the advantages of the CAN protocol like collision-resolution by non-destructive arbitration. It expands the number of data bytes per CAN frame up to 2048.
With respect to the bitrate, CAN XL fills the gap between CAN FD and 100BASE-T1 (Ethernet) with a bit rate of 10Mbit/s or more. CAN XL protocol controllers are also able to perform Classical CAN and CAN FD communication.
> More information about X_CAN IP module
Publications:
CAN XL at CAN in Automation (CiA) (external link)
-
CAN XL error detection capabilities, A. Mutter, Bosch, CiA CAN Newsletter 2/2020 (external link)
- CRC Error Detection for CAN XL, C. Senger, Institute of Telecommunications, University of Stuttgart, CiA CAN Newsletter 2/2020 (external link)
Proceedings of the postponed international CAN Conference (iCC) 2020 conference (external link)
The proceedings include the following papers from Bosch:
- F. Hartwich, “Introducing CAN XL into CAN Networks” in Proceedings of the 17th i nternational CAN Conference, Baden Baden, Germany, 2020.
- A. Mutter, "CAN XL error detection capabilities", in Proceedings of the 17th international CAN Conference, Baden-Baden, Germany, 2020.
- C. Senger, “CRC Error Detection for CAN XL” in Proceedings of the 17th international CAN Conference, Baden Baden, Germany, 2020.
Mandatory License of CAN Protocols
The CAN Protocols are patented products developed by Robert Bosch GmbH.
A CAN Protocol License is required for all implementations of CAN FD, CAN FD Light, TTCAN and CAN XL modules.