Freescale Semiconductor FlexRay MFR4310 - Figure 3-110. Single Transmit Message Buffer States; Table 3-91. Single Transmit Message Buffer State Description

FlexRay Module (FLEXRAYV4)
MFR4310 Reference Manual, Rev. 2
154 Freescale Semiconductor
MBCCSRn.EDS and MBCCSRn.LCKS are not under access control and can be accessed from the
FlexRay module at any time.
The interrupt flag MBCCSnR.MBIF is not under access control and can be accessed from the application
and the FlexRay module at any time. FlexRay module clear access has higher priority.
The FlexRay module restricts its access to the regions depending on the current state of the message buffer.
The application must adhere to these restrictions to ensure data consistency. The transmit message buffer
states are given in Figure 3-110. A description of the states is given in Table 3-91, which also provides the
access scheme for the access regions.
The status bits MBCCSRn.EDS and MBCCSRn.LCKS provide the application with the required message
buffer status information. The internal status information is not visible to the application.
3.4.6.2.2 Message Buffer States
This section describes the transmit message buffer states and provides a state diagram.
Figure 3-110. Single Transmit Message Buffer States
Table 3-91. Single Transmit Message Buffer State Description
State
MBCCSRn Access Region
Description
EDS LCKS Appl. Module
Idle 1 0 – CM,
SR
Id
le - Message Buffer is idle.
Included in message buffer search.
HDis 0 0 CFG – Dis
abled - Message Buffer under configuration.
Excluded from message buffer search.
HDisLck 0 1 CFG – Dis
abled and Locked - Message Buffer under configuration.
Excluded from message buffer search.
HLck 1 1 MSG SR Locked - Applications access to data, control, and status.
Included in message buffer search.
HLckCCSa
HL
HLck
HDisLck
HDis Idle
CCTx
HE
HLckCCMa
SA
CCSa
CCMa
SA MA
TX
RESET_STATE
DSS
DSS
CCNf
SSS
STS
HLckCCNf
STS
SSS STS
HU
HD
HL
HU
HL
HU
HL
HU
HL
HU
HE
HD
STS
CCSu
SU
SSS
DSS
DSS
MA