FlexRay Communication Controller (FlexRAY)
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor 26-109
Figure 26-128. Receive Message Buffer States
26.6.6.3.1 Message Buffer Transitions
Application Transitions
The application transitions that can be triggered by the application using the commands described in
Table 26-102. The application issues the commands by writing to the Message Buffer Configuration,
Control, Status Registers (MBCCSRn). Only one command can be issued with one write access. Each
command is executed immediately. If the command is ignored, it must be issued again.
Message Buffer Enable and Disable
Table 26-101. Receive Message Buffer States and Access
State
MBCCSRn Access from
Description
EDS LCKS Appl. Module
Idle 10–SRIdle
- Message Buffer is idle.
Included in message buffer search.
HDis 0 0 CFG – Disabled - Message Buffer under configuration.
Excluded from message buffer search.
HDisLck 0 1 CFG – Disabled and Locked - Message Buffer under configuration.
Excluded from message buffer search.
HLck 1 1 MSG – Locked - Applications access to data, control, and status.
Included in message buffer search.
CCBs 10––Buffer Subscribed - Message buffer subscribed for reception. Filter
matches next (slot, cycle, channel) tuple.
HLckCCBs 1 1 MSG – Locked and Buffer Subscribed - Applications access to data,
control, and status. Message buffer subscribed for reception.
CCRx 10––Message Receive - Message data received into related shadow
buffer.
HLckCCRx 1 1 MSG – L
ocked and Message Receive - Applications access to data, control,
and status. Message data received into related shadow buffer.
CCSu 1 0 – RX S
tatus Update - Message buffer status update. Update of status
flags, the slot status field, and the header index.
HDis
RESET_STATE
HD
HE
Idle
BS
SNS
SU
CCSu
CCBs CCRx
HLck HLckCCBs HLckCCRx
SSS
SLS
HE
HL
HDisLck
HD
HL
HU
BS
SNS
HL
HU
HU
HL
HU
SLS
SSS
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