AN1105 datasheet(6/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

manages frame shaping and acknowledgment mechanisms, bus arbitration and checks the

formal correctness of the data transmitted and received.

The physical layer is only partly defined, and the user is free to choose the transmission me-

dium for example.

Figure 1. Layered architecture of CAN (ISO 11898 definition)

1.2 CAN FRAME

There are four different CAN frame types: Data frame, Error frame, Remote frame and

Overload frame

There are also two versions of the CAN protocol: 2.0A (or base format) and 2.0B (or extended

format). The 2.0B standard introduces an extended data frame with a longer identifier. Both

frame types coexist on a CAN 2.0B bus, and its nodes must be at least able to recognize and

acknowledge both.

We will only describe here the 2.0A format, or base format.

1.2.1 CAN Data Frame

The CAN Data frame is used for data transmission and contains the following fields:

A start of frame field, consisting of one bit.

A 12-bit arbitration field, including:

– An 11-bit identifier

Data Link Layer

Physical Layer

Logical Link Control

Acceptance filtering

Overload Notification

Recovery management

Medium Access Control

Data encapsulation/decapsulation

Frame coding (stuff/destuff)

Medium access management

Error detection

Error signaling

Acknowledgement

Serialization/Deserialization

Physical Layer Signaling

Bit encoding/decoding

Bit timing

Synchronization

Physical Medium Attachment

Driver/Receiver characteristics

Medium Dependent Interface

Connector

Fault confinement

(MAC-Layer Management

Entity)

Bus Failure Management

(PLS-Layer Management

Entity)

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