CAN Protocol
CAN, CAN 2.0 and CAN-FD
CAN = CAN 2.0 = Controller Area Network, classical CAN
- CAN 2.0A (standard) : 11bits identifier
- CAN 2.0B (extend): 29bits identifier
CAN-FD = Controller Area Network Flexible Data-Rate, supports CAN 2.0

CAN-FD Frame
Standard frame

Reference
ST-Introduction to FDCAN peripherals for STM32 product classes