PXS20RM Datasheet, PDF (818/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FlexRay Communication Controller
with payload_length_static payload words and the payload length field in the transmitted frame header set
to payload_length_static.
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
(FR_PCR24). If this is not fulfilled, the dynamic payload length error flag DPL_EF in the CHI Error Flag
Register (FR_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 26-95. Frame Header Field Descriptions (Receive Message Buffer and Receive FFO)
Field
Description
R
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 Cycle Count — This is the number of the communication cycle in which the frame stored in the
message buffer was received.
PLDLEN Payload Length — This is the value of the Payload Length field of the received frame stored in the
message buffer.
HDCRC 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
Table 26-96. 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.
26-106
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor