Information

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.
45.4.8.5 Arbitration and Matching Timing
During normal reception and transmission of frames, the matching, arbitration, move-in
and move-out processes are executed during certain time windows inside the CAN frame,
as shown in the following figures.
Interm
Start Move
Move-in
Window
EOF (7)
(bit 2)
Matching Window (26 to 90 bits)
DATA and/or CRC (15 to 79)
DLC (4)
Figure 45-106. Matching and Move-In Time Windows
CRC (15)
Interm
Start Move
Arbitration Window (25 bits)
(bit 1)
Window
Start Arbitration
(delayed by TASD)
EOF (7)
Move-out
Process
Arb
Figure 45-107. Arbitration and Move-Out Time Windows
BusOff
128
...
126125124123
...
3210
Window
Move-out
Process
Arb
Count
TASD
ECR[TXERRCNT]
(Transmit Error Counter)
Figure 45-108. Arbitration at the end of Bus Off and Move-Out Time Windows
NOTE
The matching and arbitration timing shown in the preceding
figures do not take into account the delay caused by the
Functional Description
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
1192 Freescale Semiconductor, Inc.