Transcription of A CAN Physical Layer Discussion - Microchip Technology
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A CAN Physical Layer Discussion - Microchip Technology
2002 Microchip Technology 1 MAN228 INTRODUCTIONMany network protocols are described using the sevenlayer Open System Interconnection (OSI) model, asshown in Figure 1. The Controller Area Network (CAN)protocol defines the Data Link Layer and part of thePhysical Layer in the OSI model. The remaining physi-cal Layer (and all of the higher layers) are not defined bythe CAN specification. These other layers can either bedefined by the system designer, or they can be imple-mented using existing non-proprietary Higher LayerProtocols (HLPs) and Physical Data Link Layer is defined by the CAN specifica-tion. The Logical Link Control (LLC) manages the over-load control and notification, message filtering andrecovery management functions. The Medium AccessControl (MAC) performs the data encapsulation/decap-sulation, error detection and control, bit stuffing/de-stuffing and the serialization and Physical Medium Attachment (PMA) and MediumDependent Interface (MDI) are the two parts of thephysical Layer which are not defined by CAN.
destructive bit-wise arbitration scheme. It is this arbitra-tion methodology that is affected most by propagation delays. Each node involved with arbitration must be able to sample each bit level within the same bit time. For example, if two nodes at opposite ends of the bus start to transmit their messages at the same time, they
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