mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 162

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

FlexRay Module (FLEXRAYV2)
The trigger bits MBCCSRn.EDT and MBCCSRn.LCKT and the interrupt enable bit MBCCSRn.MBIE are
not under access control and can be accessed from the application at any time. The status bits
MBCCSRn.EDS and MBCCSRn.LCKS are not under access control and can be accessed from the
FlexRay module at any time.
The interrupt flag MBCCSRn.MBIF is not under access control and can be accessed from the application
and the FlexRay module at any time. FlexRay module set 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 receive message
buffer states are given in
which also provides the access scheme for the access regions.
The status bits MBCCSRn.EDS and MBCCSRn.LCKS provide the application with the required status
information. The internal status information is not visible to the application.
162
Region
RESET_STATE
State
MSG
CFG
HDis
Idle
RX
SR
HDisLck
HE
HL
HLck
HDis
HD
HU
EDS
Application
read/write
read/write
MBCCSRn
1
0
HU
Table 3-96. Receive Message Buffer States and Access (Sheet 1 of 2)
Table 3-95. Receive Message Buffer Access Region Description
-
-
HE
BS
Access from
LCKS
Figure
0
0
Figure 3-119. Receive Message Buffer States
3-119. A description of the message buffer states is given in
Appl.
write-only
read-only
CFG
Access from
Module
–
-
-
MFR4300 Data Sheet, Rev. 3
SNS
Module
HD
SR
–
HL
Message Buffer Configuration, Message Data and Status Access
Message Data, Header, and Status Access
Message Reception and Status Update
Message Buffer Search Data
HLckCCBs
Idle - Message Buffer is idle.
Included in message buffer search.
Disabled - Message Buffer under configuration.
Excluded from message buffer search.
BS
HL
CCBs
Idle
SNS
HU
SLS
SLS
Region used for
Description
SU
Freescale Semiconductor
HLckCCRx
HL
CCSu
CCRx
SSS
SSS
Table
HU
3-91,