mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 164

• Manufacturer Part Number: mfr4300
• Description: Flexray Communication Controllers
• Manufacturer: Freescale Semiconductor, Inc

FlexRay Module (FLEXRAYV2)
Module Transitions
The module transitions that can be triggered by the FlexRay module are described in
transition will be 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
all states except the CCRx state, a module transition and the application lock/unlock transition HL/HU and
can be executed at the same time. The result state is reached by first applying the module transition and
subsequently the application transition to the intermediately reached state. For example, if the message
buffer is in the buffer subscribed state CCBs and the module triggers the slot start transition SLS at the
same time as the application locks the message buffer by the HL transition, the intermediate state is CCRx
and the resulting state is locked buffer subscribed state HLckCCRx.
3.4.6.3.2
The FlexRay module starts a sequential search that checks all message buffers at the following protocol
related events:
The filters that are used for the search are described in
Filtering”.
164
Transition
•
•
•
CCRx
State
HLck
SNS
SSS
SLS
Idle
BS
SU
slot start, in the static frame segment
minislot start, in the dynamic frame segment
NIT start
Table
Message Buffer Search
symbol window start or
symbol window start or
CycleCounter match
SSS > HL
Priorities
BS > HD
BS > HD
3-99, the module transitions have a higher priority than the application transitions. For
status updated
slot match and
slot start or
Condition
slot start
NIT start
NIT start
Table 3-99. Receive Message Buffer Transition Priorities
Table 3-98. Receive Message Buffer Module Transitions
Buffer Subscribed > Message Buffer Disable
Buffer Subscribed > Message Buffer Disable
Slot or Segment Start > Message Buffer Lock
Buffer Subscribed - The message buffer filter matches next slot and cycle.
Slot Start - Start of either Static Slot or Dynamic Slot.
Symbol Window or NIT Start - Start of either Symbol Window or NIT.
Slot or Segment Start - Start of either Static Slot, Dynamic Slot, Symbol
Window, or NIT.
Status Updated - Slot Status field, message buffer status flags, header index
updated. Interrupt flag set.
MFR4300 Data Sheet, Rev. 3
module vs. application
Section 3.4.7.1, “Individual Message Buffer
Description
Description
Freescale Semiconductor
Table
3-98. Each