mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 154

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

FlexRay Module (FLEXRAYV2)
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 in order to ensure data consistency. The transmit message
buffer states are given in
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
This section describes the transmit message buffer states and provides a state diagram.
154
HDisLck
RESET_STATE
State
HLck
HDis
Idle
HDisLck
HE
HL
HLck
HDis
HD
HU
Message Buffer States
Table 3-91. Single Transmit Message Buffer State Description (Sheet 1 of 2)
EDS
HU
MBCCSRn
1
0
0
1
MA
SA
HE
LCKS
Figure
Figure 3-111. Single Transmit Message Buffer States
0
0
1
1
DSS
3-111. A description of the states is given in
Access Region
Appl.
MSG
CFG
CFG
–
HLckCCSa
STS
SSS
MFR4300 Data Sheet, Rev. 3
Module
HD
CM,
SR
SR
HU
–
–
HL
HL
HLckCCNf
Idle - Message Buffer is idle.
Included in message buffer search.
Disabled - Message Buffer under configuration.
Excluded from message buffer search.
Disabled and Locked - Message Buffer under configuration.
Excluded from message buffer search.
Locked - Applications access to data, control, and status.
Included in message buffer search.
SA
CCSa
Idle
DSS
STS
HU
HL
MA
CCNf
SSS
Description
Table
SU
STS
STS
3-91, which also
Freescale Semiconductor
DSS
HLckCCMa
CCMa
HL
CCSu
CCTx
SSS
TX
DSS
HU