cp3cn17 National Semiconductor Corporation, cp3cn17 Datasheet - Page 72
cp3cn17
Manufacturer Part Number
cp3cn17
Description
Reprogrammable Connectivity Processor With Can Interface
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3CN17.pdf
(220 pages)
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A CAN data frame consists of the following fields:
A remote frame is comprised of the following fields, which is
the same as a data frame (see CAN Frame Fields on page
70) except for the data field, which is not present.
Note that the DLC must have the same value as the corre-
sponding data frame to prevent contention on the bus. The
RTR bit is “recessive”.
Start of Frame (SOF)
Arbitration Field + Extended Arbitration
Control Field
Data Field
Cyclic Redundancy Check Field (CRC)
Start of Frame (SOF)
Arbitration Field + Extended Arbitration
Control Field
Cyclic Redundancy Check Field (CRC)
Acknowledgment field (ACK)
End of Frame (EOF)
Note:
d = dominant
r = recessive
d
IDENTIFIER
28 ... 18
11
Note:
d = dominant
r = recessive
d
r r
Arbitration Field
Arbitration Field
IDENTIFIER
10 ... 0
11
Figure 17. Extended Remote Frame
Figure 16. Standard Remote Frame
EXTENDED REMOTE FRAME (number of bits = 64)
IDENTIFIER
STANDARD REMOTE FRAME (number of bits = 44)
17 ... 0
d d d
18
Control Field
LENGTH CODE
DATA
4
72
r d d
Remote Frame
Figure 16 shows the structure of a standard remote frame.
Figure 17 shows the structure of an extended remote frame.
Control Field
LENGTH CODE
Acknowledgment Field (ACK)
End of Frame (EOF)
CRC Field
CRC
DATA
15
16
4
r
CRC Field
CRC
15
r r
16
r r
END OF
FRAME
r r
DS022
r r
r
r r
r r
END OF
FRAME
r r
DS023
r r
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