CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
(3) Data bit synchronization
• Since the receiving node has no synchronization signal, synchronization is performed using level changes
that occur on the bus.
• As for the transmitting node, data is transmitted in sync with the transmitting node’s bit timing.
(a) Hardware synchronization
This is bit synchronization that is performed when the receiving node has detected a start of frame in bus
idle mode.
• When a falling edge is detected on the bus, the current bit is assigned to the sync segment and the
next bit is assigned to the prop segment. In such cases, synchronization is performed regardless of
the SJW.
• Since bit synchronization must be established after a reset or after a wake-up, hardware
synchronization is performed only at the first level change that occurs on the bus (for the second and
subsequent level changes, bit synchronization is performed as shown below).
Figure 11-21. Coordination of Data Bit Synchronization
Phase
segment 2
Phase
segment 1
Prop
segment
Sync
segment
Start of frame
Bus idle
CAN bus
Bit timing
Содержание V850E/IA1 mPD703116
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