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6.4
Structure of the FlexRay payload
The following table shows the structure of a FlexRay payload encapsulated in a 100BASET1_SPY RAW
frame:
Note:
A single Payload encapsulated in a 100BASET1_SPY RAW Ethernet Frame can have several IDs
(See example below). For every single ID,
LENGTH
gives the length of the payload for that specific ID.
Note:
DIRECTION
specifies if the frame is received (DIRECTION ‘0’) or transmitted (DIRECTION ‘1’) for
a specific ID. In the case of FlexRay, this field will be 0. The device is not able to transmit FlexRay
frames.
The following image shows an example of a FlexRay payload frame encapsulated in a 100BASET1_SPY
RAW frame. In this case, the payload contains information about 6 different IDs with the same cycle
time.
Field Name
No. Of Bytes
Value
CYCLE
2
Time cycle in which the frame was received
MESSANGE WORD LENGTH
2
Length of the whole FlexRay frame payload
FRAME ID
2
Received Frame IDs
DIRECTION
1
Frame Direction
FRAME WORD LENGTH
1
Length of the FlexRay frame payload for a specific
ID
PAYLOAD
X
Depends of LENGTH field