CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
(b) Resynchronization
Resynchronization is performed when a level change is detected on the bus during a receive operation.
• The edge’s phase error is produced by the relative positions of the detected edge and sync segment.
<Phase error symbols>
0:
When edge is within sync segment
Positive:
Edge is before sample point (phase error)
Negative: Edge is after sample point (phase error)
• When the edge is detected as within the bit timing specified by the SJW, synchronization is performed
in the same way as hardware synchronization.
• When the edge is detected as extending beyond the bit timing specified by the SJW, synchronization
is performed on the following basis.
When phase error is positive: Phase segment 1 is lengthened to equal the SJW
When phase error is negative: Phase segment 2 is shortened to equal the SJW
• A “shifting” of the baud rate for the transmitting and receiving nodes moves the relative position of the
sample point for data on the receiving node.
Figure 11-22. Resynchronization
Phase
segment 2
Phase
segment 1
Prop
segment
Sync
segment
SOF
Next bit
Previous bit
CAN bus
Bit timing
SJW
Содержание V850E/IA1 mPD703116
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