FlexRay Communication Controller (FlexRay)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
1541
SADR_MBHF = (i * 10) + FR_SYMBADR[SMBA]; (0 < i < 1024)
Eqn. 33-8
3. The message buffer header fields for each FIFO have to be a contiguous area.
33.6.4.4
Message buffer header area (FR_MCR[FAM] = 1)
The message buffer header area contains all message buffer header fields of the physical message buffers
for the individual message buffers and receiver shadow buffers. The following rules apply to the message
buffer header fields for the two type of message buffers.
1. The start address SADR_MBHF of each message buffer header field for
individual message
buffers
and
receive shadow buffers
must fulfill
.
SADR_MBHF = (i * 10) + FR_SYMBADR[SMBA]; (0 < i < 256)
Eqn. 33-9
33.6.4.5
FIFO message buffer header area (FR_MCR[FAM] = 1)
The FIFO message buffer header area contains all message buffer header fields of the physical message
buffers for the FIFO. The following rules apply to the FIFO message buffer header fields.
1. The start byte address SADR_MBHF of each message buffer header field for the
FIFO
must fulfill
.
SADR_MBHF = (i * 10) + FR_RFSYMBADR[SMBA]; (0 < i < 1024)
Eqn. 33-10
2. The message buffer header fields for each FIFO have to be a contiguous area.
33.6.4.6
Message buffer data area
The message buffer data area contains all the message buffer data fields of the physical message buffers.
Each message buffer data field must start at a 16-bit boundary.
33.6.4.7
Sync frame table area
The sync frame table area is used to provide a copy of the internal sync frame tables for application access.
Refer to
Section 33.6.12, Sync frame ID and sync frame deviation tables
” for the description of the sync
frame table area.
33.6.5
Physical message buffer description
This section provides a detailed description of the usage and the content of the two parts of a physical
message buffer, the message buffer header field and the message buffer data field.
33.6.5.1
Message buffer protection and data consistency
The physical message buffers are located in the FlexRay memory area. The CC provides no means to
protect the FlexRay memory area from uncontrolled or illegal host or other client write access. To ensure
data consistency of the physical message buffers, the application must follow the write access scheme that
is given in the description of each of the physical message buffer fields.
Summary of Contents for MPC5644A
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