TC1784
Controller Area Network Controller (MultiCAN)
User´s Manual
19-4
V1.1, 2011-05
MLI, V2.0
CAN protocol to the “in-bit-response” group of protocols. The recessive ACK delimiter
bit, which must not be overwritten by a dominant bit, completes the Acknowledge Field.
Seven recessive End-of-Frame (EOF) bits finish the Data Frame. Between any two
consecutive frames, the bus must remain in the recessive state for at least 3 bit times
(called Inter Frame Space). If after the Inter Frame Space, no other nodes attempt to
transmit the bus remains in idle state with a recessive level.
Figure 19-1 CAN Data Frame
Extended Data Frame
In the Extended CAN Data Frame, the message identifier of the standard frame has
been extended to 29-bit. A split of the extended identifier into two parts, an 11-bit least
Bus Idle
Dominant Level
Recessive Level
Bus Idle
Bus Idle
Dominant Level
Recessive Level
MCT06258
11
Standard Data Frame
ACK Delimiter
ACK Slot
CRC Delimiter
CRC Sequence
Data Field
Reserved (D)
IDE Bit (D)
RTR Bit (D)
Identifier
4
1
1
1
1
1
1
15
Start of Frame
Control Field
Arbitration
Field (12 bit)
1
7
3
Inter Frame Space
End of Frame (EOF)
Acknowledge
Field
CRC Field
1
1
1
15
7
3
Extended Data Frame
SRR Bit (R)
IDE Bit (R)
29-bit Identfier
Arbitration
Field (32 bit)
RTR Bit (D)
2 Reserved (D)
0 - 64
Bus Idle
11
4
2
1
1
0 - 64
Data Length Code
18
1 1
Содержание TC1784
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