Freescale Semiconductor FlexRay MFR4310 - Table 3-105. Double Transmit Message Buffer Module Transitions; Table 3-106. Double Transmit Message Buffer Transition Priorities

FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
Freescale Semiconductor 173
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 3-106, the module transitions have a higher priority than the application
transitions. The priorities among the FlexRay module transitions and the related states are given in the
second part of Table 3-106. These priorities apply only to the transmit side. The internal message transmit
start transition IS has tho lowest priority.
Table 3-105. Double Transmit Message Buffer Module Transitions
Transition Condition Description
common transitions
IS
see Section 3.4.6.4.5,
“Internal Message
Transfer
I
nternal 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
S
lot 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 S
tatus 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.
Table 3-106. Double Transmit Message Buffer Transition Priorities
State Priority Description
module vs. application
Idle IS > HD
IS > HL
Internal Message Transfer Start > Message Buffer Disable
Internal Message Transfer Start > Message Buffer Lock
module internal
Idle MA > SA Message Available > Slot Assigned
CCMa TX > STS
TX > DSS
Transmission Slot Start > Static Slot Start
Transmission Slot Start > Dynamic Slot Start