Grundlagen FlexRay - Institut für Automatisierungs- und ...
Grundlagen FlexRay - Institut für Automatisierungs- und ...
Grundlagen FlexRay - Institut für Automatisierungs- und ...
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<strong>Gr<strong>und</strong>lagen</strong> <strong>FlexRay</strong> BasicsV 1.1 13<br />
Figure 2.2 Structure of a <strong>FlexRay</strong> node [VeSc11]<br />
Every component has specific tasks. There are different types of microcontrollers, with or<br />
without an integrated Communication Controller. The Bus Driver provides the physical<br />
connection to the respective channel. The Bus Guardian was designed as a security system<br />
between Communication Controller and Bus Driver, but isn’t used as discussed before.<br />
The Communication Controller implements the <strong>FlexRay</strong> protocol. It controls the bus access<br />
(Media Access Control (MAC)), verifies the timing specified by the scheduling and the<br />
syntax of the frames (Frame and Symbol Processing (FSP)), performs the transformation of<br />
payload data into a bit stream (Coding and Decoding Process (CODEC)) and the<br />
synchronization with the global time base (Clock Synchronization Process (CSP)). An indepth<br />
description of these processes can be fo<strong>und</strong> in the <strong>FlexRay</strong> Communications System<br />
Protocol Specification [FRPS05], where they are described in the Specification and<br />
Description Language (SDL).<br />
The host runs the actual application, which controls the Communication Controller via the<br />
Controller Host Interface (CHI) and the Protocol Operation Control (POC)).<br />
Bäurle 12.10.2012