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TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-206
V1.1, 2011-05
E-Ray, V3.13
(if available) and Communication Controller to perform the cluster wakeup. The
Communication Controller provides to the Host the ability to transmit a special wakeup
pattern on each of its available channels separately. The Communication Controller
needs to recognize the wakeup pattern only during “WAKEUP” state.
Wakeup may be performed on only one channel at a time. The Host has to configure the
wakeup channel while the Communication Controller is in “CONFIG” state by writing bit
in the SUC Configuration Register 1. The Communication Controller
ensures that ongoing communication on this channel is not disturbed. The
Communication Controller cannot guarantee that all nodes connected to the configured
channel awake upon the transmission of the wakeup pattern, since these nodes cannot
give feedback until the startup phase. The wakeup procedure enables single-channel
devices in a two-channel system to trigger the wakeup, by only transmitting the wakeup
pattern on the single channel to which they are connected. Any coldstart node that
deems a system startup necessary will then wake the remaining channel before initiating
communication startup.
The wakeup procedure tolerates any number of nodes simultaneously trying to wakeup
a single channel and resolves this situation such that only one node transmits the
pattern. Additionally the wakeup pattern is collision resilient, so even in the presence of
a fault causing two nodes to simultaneously transmit a wakeup pattern, the resulting
collided signal can still wake the other nodes.
After wakeup the Communication Controller returns to “READY” state and signals the
change of the wakeup status to the Host by setting bit
in the Status Service
Request Register. The wakeup status vector can be read from the Communication
Controller Status Vector register
. If a valid wakeup pattern was received
also either flag
in the Status Service Request Register is
set.
Содержание TC1784
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