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Time Stamp Generation

Last updated: 2019-07-10

CAN:




SOF
(Start of Frame): for synchronization
RTR (Remote Transmission Request): RTR = 0 (dominant) data frame, RTR = 1 (recessive) remote frame
IDE (Identifier Extension): IDE=0 (dominant) for 11-Bit IDs, IDE = 1 (recessive) for 29-Bit IDs)
DLC (Date Length Code): number of data bytes in data field
CRC (Cyclic Redundancy Checksum)
ACK (Acknowledgement)
EOF (End Of Frame)

TX and RX time stamp is generated on different points:

Ethernet:
 



PRB: Preamble (Start of transmission)    Time Stamp: time_ns of ethernetPacket 
DA: Destination Address
SA: Source Address                                time_ns =  SOF + FrameLen 
Payload: Data field (42-1500 Byte)
CRC: Cyclic Redundancy Check

LIN:

LIN time stamp is generated at the end of the LIN message (in the last stop bit).

FlexRay:

FlexRay time stamp is generated at the end of CID (Channel Idle Delimiter) - of static and dynamic frames.




 

MOST:

MOST time stamp generation depends on the configured device mode:

Master/Slave: MOST time stamp is generated as soon as the MOST controller reports the received message or packet (after receiving and processing the message or packet internally).

Spy: MOST time stamp is generated with the last bit of the message or packet.
 

 
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2019-07-10
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