mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 152

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

MBCCSRn.MTD
FlexRay Module (FLEXRAYV2)
The application configures the size of the two segments of individual message buffers by writing the
message buffer number of the last message buffer in the first segment into the LAST_MB_SEG1 field in
the
The application configures the length of the message buffer data fields for both of the message buffer
segments by writing to the MBSEG2DS and MBSEG1DS fields in the
Register
Depending on the current receive functionality of the FlexRay module, the application must configure the
receive shadow buffers. For each segment and for each channel with at least one individual receive
message buffer assigned, the application must configure the related receive shadow buffer using the
Receive Shadow Buffer Index Register
3.4.6.1.2
The second part of the message buffer configuration data is specific for each message buffer.
These data can be changed only when either
The individual message buffer type is defined by the MTD and MBT bits in the
Configuration, Control, Status Registers (MBCCSRn)
The message buffer specific configuration data are
The meaning of the specific configuration data depends on the message buffer type, as given in the detailed
message buffer type descriptions
“Receive Message
3.4.6.2
The section provides a detailed description of the functionality of single buffered transmit message buffers.
A single transmit message buffer is used by the application to provide message data to the FlexRay module
that will be transmitted over the FlexRay Bus. The FlexRay module uses the transmit message buffers to
152
Message Buffer Segment Size and Utilization Register (MBSSUTR)
•
•
1. MCM, MBT, MTD bits in
2. all fields and bits in
3. all fields and bits in
4. all fields and bits in
0
0
1
1
the protocol is in the
the message buffer is disabled, i.e. MBCCSRn.EDS = 0
(MBDSR).
Single Transmit Message Buffers
Specific Configuration Data
MBCCSRn.MBT
Buffers”, and
0
1
0
1
Message Buffer Cycle Counter Filter Registers (MBCCFRn)
Message Buffer Frame ID Registers (MBFIDRn)
Message Buffer Index Registers (MBIDXRn)
POC:config
Table 3-89. Individual Message Buffer Types
Section 3.4.6.4, “Double Transmit Message
Section 3.4.6.2, “Single Transmit Message
Message Buffer Configuration, Control, Status Registers (MBCCSRn)
(RSBIR).
MFR4300 Data Sheet, Rev. 3
state or
Individual Message Buffer Description
as given in
Double Transmit Message Buffer
Single Transmit Message Buffer
Receive Message Buffer
Table
Reserved
Message Buffer Data Size
3-89.
Buffers”,
Buffer”.
Message Buffer
Freescale Semiconductor
Section 3.4.6.3,