NEC V850E/RS1 User Manual page 530

(2) Remote frame
A remote frame is composed of six fields.
Remarks: 1. The data field is not transferred even if the control field's data length code is not
(3) Description of fields
<1> Start of frame (SOF)
The start of frame field is located at the start of a data frame or remote frame.
Remark:
• If a dominant level is detected in the bus idle state, a hardware synchronization is performed
• If a dominant level is sampled at the sample point following such a hardware synchronization,
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Remote frame
R
D
<1> <2> <3>
"0000B".
2. D: Dominant = 0
R: Recessive = 1
Figure 16-5: Start of Frame (SOF)
(Interframe space or bus idle)
R
D
D: Dominant = 0
R: Recessive = 1
(the current TQ is assigned to be the SYNC segment).
the bit is assigned to be a SOF. If a recessive level is detected, the protocol layer returns to the
bus idle state and regards the preceding dominant pulse as a noise only. In this case an error
frame is not generated.
Chapter 16 FCAN Controller
Figure 16-4: Remote Frame
<5> <6> <7>
Start of frame
1 bit
User's Manual U16702EE3V2UD00
<8>
Interframe space
End of frame (EOF)
ACK field
CRC field
Control field
Arbitration field
Start of frame (SOF)
(Arbitration field)