Communication Cycle, Macrotick and Microtick
Dominique Paret · 2012
This chapter which deals with the aspects of synchronisation and Global Time during normal operation of communication, begins by presenting a few words of the time hierarchy which is set up in FlexRay. Synchronisation of the nodes in a FlexRay network takes place twice, or at two levels, called ‘macroticks’ and ‘microticks’. The chapter illustrates the general, very normal problem of the relationships that can exist between the clocks. FlexRay’s proposed solution for synchronisation between nodes is complex, and to avoid difficulties of comprehension, it is chosen to divide it into two parts: the first about the concept of ‘synchronism’, the second about the field of ‘isochronism’. At the end of the chapter, the link is established between the two concepts. The chapter also looks how and where the corrective values are applied. Controlled Vocabulary Terms synchronisation