Grundlagen FlexRay - Institut fÃ¼r Automatisierungs- und ...

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Grundlagen FlexRay BasicsV 1.1 6 Name conventions The following name conventions are geared to the FlexRay specification 2.1. := [] := a | c | v | g | p := d | l | n | s | u table 1 Parameter prefix 1 Prefix_1 Typ Beschreibung a c v g p auxiliary parameter Protocol constant Node variable Network parameter Node parameter This auxiliary parameter is used to define or derive other parameters or limits. This value defines properties or limits of the protocol. The value is provided in the protocol and cannot be changed. Value which can change depending on time, events etc. Global parameter, which is valid for all nodes. It can be defined in the POC:default config state and can only be altered in the POC:config state. Parameter which can have different values for different nodes in the network. It can be defined in the POC:default config state and can only be altered in the POC:config state. table 2 Parameter prefix 2 Prefix_2 Typ Beschreibung d Time A value (parameter, variable …) which describes a period of time between two points of time l Length Physical length, e.g. of a cable n Amount Amount, e.g. of slots s Set A set of values (parameters, variables …) u Voltage Voltage difference between two cables Bäurle 12.10.2012
Grundlagen FlexRay BasicsV 1.1 7 Glossary AUTOSAR Backbone Bus Bus system Bus Driver Branch Channel Idle Cluster Coldstart Node Communication Controller Communication Cycle Communication Slot Cycle Counter Cycle Time Development partnership in the automotive sector, which defines standards for the development of software components A backbone is a network with a high data rate A bus is a shared connection between several units (in this case: FlexRay nodes) A communication system for data transfer An electronic component with a transmitter and a receiver, which enables the communication of the communication controller and the bus A sub-network of a cluster A state where no data is transmitted on the bus A FlexRay network A network node, which is allowed to initialize a startup procedure on an idle bus An electronic component, which implements the FlexRay protocol in each FlexRay node A communication cycle is a complete instance of a communication structure in the FlexRay system, which is repeated cyclic. The communication cycle consists of a static segment, a dynamic segment (optional), a symbol window (optional) and the NIT. In the TDMA method, every node is assigned a time interval for exclusive bus access. This interval is called a communication slot an is identified by a unique Slot ID, The number of the current communication cycle The current duration of a communication cycle in macrotics. The cycle time is reset to zero at the start of a new communication cycle. Dynamic Segment The dynamic segment is used to transmit non-regular data. It use is optional in a FlexRay-cycle, and it utilizes the FTMDA method. Dynamic Communication Slot This slot consists of several minislots, and is variable in its length Bäurle 12.10.2012
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