FlexRay Communication Controller (FLEXRAY)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
30-116
Freescale Semiconductor
Preliminary
state will not be changed and the message buffer lock error flag LCK_EF in the
Module Transitions
The module transitions that can be triggered by the FlexRay block are described in
transitions C1 and C2 apply to both sides of the message buffer and are applied at the same time. All other
FlexRay block transitions apply to the transmit side only.
Transition Priorities
The application can trigger only one transition at a time. There is no need to specify priorities among them.
, the module transitions have a higher priority than the
application transitions. The priorities among the FlexRay block transitions and the related states are given
in the second part of
. These priorities apply only to the transmit side. The internal message
transmit start transition IS has tho lowest priority.
Table 30-106. Double Transmit Message Buffer Host Transitions
Transition
Host Command
Condition
Description
HE
MBCCSR[2n+1].EDT:= 1
MBCCSR[2n+1].EDS = 0 Application triggers message buffer enable.
HD
MBCCSR[2n+1].EDS = 1 Application triggers message buffer disable.
HL
MBCCSR[2n].LCKT:= 1
MBCCSR[2n].LCKS = 0 Application triggers message buffer lock.
HU
MBCCSR[2n].LCKS = 1 Application triggers message buffer unlock.
Table 30-107. Double Transmit Message Buffer Module Transitions
Transition
Condition
Description
common transitions
IS
see
Internal Message Transfer Start - Start transfer of message data from commit
side to transmit side.
IE
Internal Message Transfer End - Stop transfer of message data from commit
side to transmit side.
Note: The internal message transfer is stopped before the slot or segment start.
transmit side specific transitions
SA
slot match and
static slot
Slot Assigned - Message buffer is assigned to next static slot.
MA
slot match and
CycleCounter match
Message Available - Message buffer is assigned to next slot and cycle counter
filter matches.
TX
slot start and
MBCCSR[2n+1].CMT = 1
Transmission Slot Start - Slot Start and commit bit CMT is set.
In case of a dynamic slot, pLatestTx is not exceeded.
SU
status updated
Status Updated - Slot Status field and message buffer status flags updated.
Interrupt flag set.
STS
static slot start
Static Slot Start - Start of static slot.
DSS
dynamic slot start or
symbol window start or
NIT start
Dynamic Slot or Segment Start. - Start of dynamic slot or symbol window or
NIT.
SSS
slot start or
symbol window start or
NIT start
Slot or Segment Start - Start of static slot or dynamic slot or symbol window or
NIT.