CP3BT26 Datasheet, PDF (113/278 Pages) National Semiconductor (TI) – Reprogrammable Connectivity Processor with Bluetooth-R, USB, and CAN Interfaces

A CAN data frame consists of the following fields:
„ Start of Frame (SOF)
„ Arbitration Field + Extended Arbitration
„ Control Field
„ Data Field
„ Cyclic Redundancy Check Field (CRC)
„ Acknowledgment Field (ACK)
„ End of Frame (EOF)
Remote Frame
Figure 38 shows the structure of a standard remote frame.
Figure 39 shows the structure of an extended remote frame.
STANDARD REMOTE FRAME (number of bits = 44)
Arbitration Field
11
Control Field
4
16
CRC Field
15
CRC
END OF
FRAME
d
IDENTIFIER
10 ... 0
Note:
d = dominant
r = recessive
ddd
DATA
LENGTH CODE
r rrrrrrrr
DS022
Figure 38. Standard Remote Frame
EXTENDED REMOTE FRAME (number of bits = 64)
Arbitration Field
11
18
Control Field
4
16
CRC Field
15
CRC
d
rr
IDENTIFIER
28 ... 18
Note:
d = dominant
r = recessive
IDENTIFIER
17 ... 0
r dd
DATA
LENGTH CODE
Figure 39. Extended Remote Frame
A remote frame is comprised of the following fields, which is
the same as a data frame (see CAN Frame Fields on page
111) except for the data field, which is not present.
„ Start of Frame (SOF)
„ Arbitration Field + Extended Arbitration
„ Control Field
„ Cyclic Redundancy Check Field (CRC)
„ Acknowledgment field (ACK)
„ End of Frame (EOF)
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”.
END OF
FRAME
r rrrrrrrr
DS023
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