ISO - DIS 11898-1
Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical coding sublayer
Organization: | ISO |
Publication Date: | 3 July 2023 |
Status: | pending |
Page Count: | 89 |
ICS Code (Car informatics. On board computer systems): | 43.040.15 |
scope:
This document specifies the CAN data link layer (DLL) and the physical coding sub-layer (PCS). The CAN DLL features Data fields of up to 2048 byte when the CAN XL frame format is used.
This document divides the CAN data link layer (DLL) into the logical link control (LLC) and the medium access control (MAC) sub-layers. The DLL's service data unit (SDU), which interfaces the LLC and the MAC, is implemented by means of the LLC frame. The LLC frame also features the service data unit type (SDT) and the virtual CAN network ID (VCID), which provide higher-layer protocol configuration and identification information. There are five implementation options:
- support of the Classical CAN frame format only, not tolerating the FD frame format;
- support of the Classical CAN frame format and tolerating the FD frame format;
- support of the Classical CAN frame format and the FD frame format;
- support of the Classical CAN frame format, the FD frame format, and the XL frame format;
- support of the FD frame format for CAN FD Light responders (Annex A).
The fourth option is recommended to be implemented for new designs.
NOTE Nodes of the first option can communicate with nodes of the third and fourth option when only the Classical CAN frame format are used; otherwise, Error Frames are generated.