mfr4300 Freescale Semiconductor, Inc, mfr4300 Datasheet - Page 145

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

3.4.5.2.2
Data Field Offset Content
For a detailed description of the Data Field Offset, see
Data Field Offset Access
The application shall program the Data Field Offset when configuring the message buffers either in the
POC:config
3.4.5.2.3
The slot status is a read-only structure for the application and a write-only structure for the FlexRay
module. The meaning and content of the slot status in the message buffer header field depends on the
message buffer type.
Receive Message Buffer and Receive FIFO Slot Status Description
This section describes the slot status structure for the individual receive message buffers and receive
FIFOs. The content of the slot status structure for receive message buffers depends on the message buffer
type and on the channel assignment for individual receive message buffers as given by
Freescale Semiconductor
CYCCNT
PLDLEN
HDCRC
Field
Cycle Count
Payload Length in 16-Bit Units
Note: The value of this field is given in numbers of 16-bit units
Header CRC
state or when the message buffer is disabled.
• For receive message buffer and receive FIFOs, this field provides the number of the communication cycle in
• For transmit message buffers, the value of this field is ignored. The FlexRay module will overwrite this value
• For receive message buffers and receive FIFOs, this field provides the value of the payload length field of the
• For transmit message buffers assigned to the static segment, this value is ignored for the frame generation.
• For transmit message buffers assigned to the dynamic segment, this value is used to set the value of the
• For receive and FIFO message buffers, this field provides the value of the
• For transmit message buffers, this field provides the
which the frame stored in this message buffer was received.
with the current cycle count value when it transmits the frame.
first valid frame received on the FlexRay bus in the slot indicated by the FID field.
The FlexRay module uses the value in the PCR19.paylaod_length_static to set the value of the
field in the transmitted frame.
Payload length
FlexRay module transmits this value in the
Data Field Offset Description
Slot Status Description
Table 3-81. Frame Header Field Descriptions (Continued)
field in the transmitted frame.
MFR4300 Data Sheet, Rev. 3
Header CRC
Description
Section 3.4.2.1.2, “Data Field
Header CRC
field of the transmitted frame.
value as it was given by the application.The
Header CRC
FlexRay Module (FLEXRAYV2)
Offset”.
of the received frame.
Table
Payload length
3-82.
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