Definitions from CAN Specification

The time for transmitting one bit in CAN communication is divided into four periods (segments) as shown below. (CAN Communication Transmission Time)

By specifying the length of these periods, you can adjust the time point (Sample Point) earlier or later at which bits are detected.
Therefore, even in environments with a lot of electrical noise, each bit can be reliably recognized.

For details on each segment, please refer to ISO 11898 and ISO 11519-2.

Segment Name

Summary

Supplement

Sync_Seg

Synchronization Segment

This is the period for CAN bus synchronization.

Prop_Seg

Propagation Segment

This period is used to absorb the delay time caused by various factors.

Phase_Seg1

Phase_Segment1

This is the period from immediately after Prop_Seg until the end of the sample point.
"Sync_Seg" + "Prop_Seg + Phase_Seg1" is also called "Time Segment 1 (TSeg1)".

Phase_Seg2

Phase_Segment2

This is the period from immediately after the sample point until the end of 1-bit transmission.
Also called "Time Segment 2 (TSeg2)".