mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 153

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

provide information about the transmission process and status information about the slot in which message
was transmitted.
The individual message buffer with message buffer number n is configured to be a single transmit message
buffer by the following settings:
3.4.6.2.1
To certain message buffer fields, both the application and the FlexRay module have access. To ensure data
consistency, a message buffer locking scheme is implemented, which is used to control the access to the
data, control, and status bits of a message buffer. The access regions for single transmit message buffers
are depicted in
indicated in
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
Freescale Semiconductor
•
•
Region
MSG
CFG
CM
NF
SR
TX
MBCCSRn.MBT = ‘0’ (single buffered message buffer)
MBCCSRn.MTD = ‘1’ (transmit message buffer)
Table
Access Regions
Figure
Table 3-90. Single Transmit Message Buffer Access Regions Description
Application
read/write
read/write
3-91, the access scheme given for that region applies to the message buffer.
Figure 3-110. Single Transmit Message Buffer Access Regions
-
-
-
-
3-110. A description of the regions is given in
Access from
CFG
MSG
read/write
read-only
read-only
read-only
Module
Message Buffer Header Field: Frame Header
Message Buffer Header Field: Data Field Offset
MBIDXRn.MBIDX
MBCCSRn.CMT
Message Buffer Data Field: DATA[0-N]
Message Buffer Header Field: Slot Status
MBCCSRn.MBT/MTD
MBCCFRn.MTM/CHA/CHB/CCF*
MBFIDRn.FID
-
-
MFR4300 Data Sheet, Rev. 3
Message Buffer Configuration
Message Data and Slot Status Access
Message Header Access for Null Frame Transmission
Message Transmission and Slot Status Update
Message Buffer Validation
Message Buffer Search
Region used for
Table
CMT
NF
3-90. If an region is active as
TX
SR
FlexRay Module (FLEXRAYV2)
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