FlexCAN RM0046
570/936 Doc ID 16912 Rev 5
Table 287 gives an overview of the CAN compliant segment settings and the related
parameter values.
Note: It is the user’s responsibility to ensure the bit time settings are in compliance with the CAN
standard. For bit time calculations, use an IPT (Information Processing Time) of 2, which is
the value implemented in the FlexCAN module.
Arbitration and matching timing
During normal transmission or reception of frames, the arbitration, matching, move-in and
move-out processes are executed during certain time windows inside the CAN frame, as
shown in Figure 278.
Figure 278. Arbitration, match, and move time windows
Table 286. Time segment syntax
Syntax Description
SYNC_SEG System expects transitions to occur on the bus during this period.
Transmit Point A node in transmit mode transfers a new value to the CAN bus at this point.
Sample Point
A node samples the bus at this point. If the three samples per bit option is
selected, then this point marks the position of the third sample.
Table 287. CAN standard compliant bit time segment settings
Time Segment 1 Time Segment 2
Resynchronization
Jump Width
5 .. 10 2 1 .. 2
4 .. 11 3 1 .. 3
5 .. 12 4 1 .. 4
6 .. 13 5 1 .. 4
7 .. 14 6 1 .. 4
8 .. 15 7 1 .. 4
9 .. 16 8 1 .. 4
CRC (15)
EOF (7)
Interm
Start Move
Matching/Arbitration Window (24 bits)
Move
(bit 6)
Window
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