Datasheet

T
enter
T2
T6
T3 T5
WAKEUP
WAKEUP
SEND
WAKEUP
LISTEN
WAKEUP
DETECT
T4
T
exit
READY
WAKEUP
STANDBY
T1
www.ti.com Module Operation
Figure 26-13. Structure of POC State WAKEUP
Table 26-7. State Transitions WAKEUP
T# Condition From To
enter Host commands change to WAKEUP state by writing SUCC1.CMD(3- READY WAKEUP
0) = 0011 (WAKEUP command)
1 CHI command WAKEUP triggers wakeup FSM to transit to WAKEUP_STANDBY WAKEUP_LISTEN
WAKEUP_LISTEN state
2 Received WUP on wakeup channel selected by bit SUCC1.WUCS OR WAKEUP_LISTEN WAKEUP_STANDBY
frame header on either available channel
3 Timer event WAKEUP_LISTEN WAKEUP_SEND
4 Complete, non-aborted transmission of wakeup pattern WAKEUP_SEND WAKEUP_STANDBY
5 Collision detected WAKEUP_SEND WAKEUP_DETECT
6 Wakeup timer expired OR WUP detected on wakeup channel selected WAKEUP_DETECT WAKEUP_STANDBY
by bit SUCC1.WUCS OR frame header received on either available
channel
exit Wakeup completed (after T2 or T4 or T6) OR host commands change WAKEUP READY
to READY state by writing SUCC1.CMD(3-0) = 0010 (READY
command). This command also resets the wakeup FSM to
WAKEUP_STANDBY state.
The WAKEUP_LISTEN state is controlled by the wakeup timer and the wakeup noise timer. The two
timers are controlled by the parameters Listen Timeout SUCC2.LT(20-0) and Listen Timeout Noise
SUCC2.LTN(3-0). Listen timeout enables a fast cluster wakeup in case of a noise free environment, while
listen timeout noise enables wakeup under more difficult conditions regarding noise interference.
1177
SPNU563–May 2014 FlexRay Module
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