Freescale Semiconductor FlexRay MFR4310 - Table 3-93. Single Transmit Message Buffer Module Transitions; Table 3-94. Single Transmit Message Buffer Transition Priorities

FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
156 Freescale Semiconductor
Module Transitions
The module transitions that can be triggered by the FlexRay module are described in Table 3-93. Each
transition is triggered for certain message buffers when the related condition is fulfilled.
Transition Priorities
The application can trigger only one transition at a time. There is no need to specify priorities among them.
As shown in the first part of Table 3-94, the module transitions have a higher priority than the application
transitions. For all states except the CCMa state, both a lock/unlock transition HL/HD and a module
transition can be executed at the same time. The result state is reached by first applying the application
transition and subsequently the module transition to the intermediately reached state. For example, if the
message buffer is in the HLck state and the application unlocks the message buffer by the HU transition
and the module triggers the slot assigned transition SA, the intermediate state is Idle and the resulting state
is CCSa.
The priorities among the module transitions is given in the second part of Table 3-94.
HL
MBCCSRn.LCKT:= 1
MBCCSRn.LCKS = 0 Application triggers message buffer lock.
HU MBCCSRn.LCKS = 1 Application triggers message buffer unlock.
Table 3-93. Single Transmit Message Buffer Module Transitions
Transition Condition Description
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
MBCCSRn.CMT = 1
T
ransmission 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
D
ynamic 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.
Table 3-94. Single Transmit Message Buffer Transition Priorities
State Priorities Description
module vs. application
Idle, HLck SA > HD
MA > HD
Slot Assigned > Message Buffer Disable
Message Available > Message Buffer Disable
CCMa TX > HL Transmission Start > Message Buffer Lock
Table 3-92. Single Transmit Message Buffer Application Transitions
Transition Command Condition Description