PXR40RM Datasheet, PDF (673/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

FlexRay Communication Controller (FLEXRAY)
For transmit message buffers assigned to the dynamic segment, the PLDLEN value must be less than or
equal to the value of the max_payload_length_dynamic field in the Protocol Configuration Register 24
(PCR24). If this is not fulfilled, the dynamic payload length error flag DPL_EF in the CHI Error Flag
Register (CHIERFR) is set when the message buffer is under transmission. A syntactically and
semantically correct dynamic frame is generated with PLDLEN payload words and the payload length
field in the frame header set to PLDLEN.
Table 22-85. Frame Header Field Descriptions (Receive Message Buffer and Receive FFO)
Field
R
Description
Reserved Bit — This is the value of the Reserved bit of the received frame stored in the message buffer
PPI
NUF
SYF
SUF
FID
Payload Preamble Indicator — This is the value of the Payload Preamble Indicator of the received frame stored
in the message buffer.
Null Frame Indicator — This is the value of the Null Frame Indicator of the received frame stored in the message
buffer.
Sync Frame Indicator — This is the value of the Sync Frame Indicator of the received frame stored in the
message buffer.
Startup Frame Indicator — This is the value of the Startup Frame Indicator of the received frame stored in the
message buffer.
Frame ID — This is the value of the Frame ID field of the received frame stored in the message buffer.
CYCCNT
PLDLEN
HDCRC
Cycle Count — This is the number of the communication cycle in which the frame stored in the message buffer
was received.
Payload Length — This is the value of the Payload Length field of the received frame stored in the message
buffer.
Header CRC — This is the value of the Header CRC field of the received frame stored in the message buffer.
Field
R
PPI
NUF
SYF
SUF
FID
Table 22-86. Frame Header Field Descriptions (Transmit Message Buffer)
Description
Reserved Bit — This bit is not used, the value of the Reserved bit is generated internally according to FlexRay
Communications System Protocol Specification, Version 2.1 Rev A.
Payload Preamble Indicator — This bit provides the value of the Payload Preamble Indicator for the frame
transmitted from the message buffer.
Null Frame Indicator — This bit is not used, the value of the Null Frame Indicator is generated internally
according to FlexRay Communications System Protocol Specification, Version 2.1 Rev A.
Sync Frame Indicator — This bit is not used, the value of the Sync Frame Indicator is generated internally
according to FlexRay Communications System Protocol Specification, Version 2.1 Rev A.
Startup Frame Indicator — This bit is not used, the value of the Startup Frame Indicator is generated internally
according to FlexRay Communications System Protocol Specification, Version 2.1 Rev A.
Frame ID — This field is checked as described in Frame Header Checks.
CYCCNT Cycle Count — This field is not used, the value of the transmitted Cycle Count field is taken from the internal
communication cycle counter.
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
22-89