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Chapter 16
FCAN Controller
User’s Manual U16702EE3V2UD00
(b) Resynchronization
Synchronization is established again if a level change is detected on the bus during reception
(only if a recessive level was sampled previously).
•
The phase error of the edge is given by the relative position of the detected edge and sync
segment.
<Sign of phase error>
0: If the edge is within the sync segment
Positive: If the edge is before the sample point (phase error)
Negative: If the edge is after the sample point (phase error)
If phase error is positive: Phase segment 1 is longer by specified SJW.
If phase error is negative: Phase segment 2 is shorter by specified SJW.
•
The sample point of the data of the receiving node moves relatively due to the “discrepancy” in
the baud rate between the transmitting node and receiving node.
Figure 16-21:
Resynchronization
CAN bus
Bit timing
CAN bus
Bit timing
Phase segment 1
Prop
segment
Sync
segment
Phase
segment 2
Phase segment 1
Prop
segment
Sync
segment
Phase
segment 2
Sample point
Sample point
If phase error is negative
If phase error is positive
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