ES920.1 - User’s Guide
19
ETAS
Functional Description
4
Functional Description
This chapter describes the block diagram, bus termination, the “Wake Up” and
“Sleep” functions and also provides tips on the firmware update.
4.1
Block Diagram
The ES910 has a slot for extension modules (extension slot). This slot can, for
example, accommodate the ES920.1 FlexRay Module.
Fig. 4
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1
Block Diagram of the ES920.1
4.2
Bus Termination Resistor
The FlexRay specification makes it possible to create different bus topologies,
such as a passive bus, passive star or active star.
Each of the topologies requires the relevant bus termination. The FlexRay termi
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nation designated by the ETAS FlexRay specification is 100 Ohm. To support the
creation of a rapid prototyping environment in FlexRay networks, ETAS provides
FlexRay cables with corresponding FlexRay terminations. The termination has to
be connected to the cable or to the connector.
4.3
“Wake Up” and “Sleep” Functions
The ES920.1 module supplements the “Wake Up” and “Sleep” functions of the
ES910 module with further control possibilities. The ES920.1 can control the tog
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gling of the overall system ES910/ ES920.1 in the vehicle between on and
standby.
The overall system ES910/ ES920.1 can effectively be in three different states:
Off, Standby and On.
6 mm
FLX1
FLX2
FlexRay
Controller
FlexRay
Tranceiver