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Bosch Semiconductors

CAN Protocols

CAN FD Protocol

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.

> More information about M_CAN IP module

CAN FD Light Protocol

TSU

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).

> More information about M_CAN IP module

CAN XL Protocol

CAN_XL

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)


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

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.

> More information about CAN Protocol License