Intel 8XC196NT Standard Message Frame, Extended Message Frame, Field Description Bit Count

87C196CB SUPPLEMENT

Table 7-6. Standard Message Frame

Field	Description	Bit Count
SOF	Start-of-frame. A dominant (0) bit marks the beginning of a message frame.	1
	11-bit message identifier.
Arbitration		12
	RTR. Remote transmission request. Dominant (0) for data frames; recessive (1)
	for remote frames.
	IDE. Identifier extension bit; always dominant (0).
Control	r0. Reserved bit; always dominant (0).	6
	DLC. Data length code. A 4-bit code indicating the number of data bytes (0–8).
Data	Data. 1 to 8 bytes for data frames; 0 bytes for remote frames.	0–64
CRC	CRC code. A 15-bit CRC code plus a recessive (1) delimiter bit.	16
Ack	Acknowledgment. A dominant (0) bit sent by nodes receiving the frame plus a	2
	recessive (1) delimiter bit.
End of frame	7 recessive (1) bits mark the end of a frame.	7
	Minimum standard message frame length (bits)	44–108

Table 7-7. Extended Message Frame

Field	Description	Bit Count
SOF	Start-of-frame. A dominant (0) bit marks the beginning of a message frame.	1
	11 bits of the 29-bit message identifier.
	SRR. Substitute remote transmission request; always recessive (1).
Arbitration	IDE. Identifier extension bit; always recessive (1).	32
	18 bits of the 29-bit message identifier.
	RTR. Remote transmission request; always recessive (1).
	r0. Reserved bit; always dominant (0).
Control	r1. Reserved bit; always dominant (0).	6
	DLC. Data length code. A 4-bit code indicating the number of data bytes (0–8).
Data	Data. 1 to 8 bytes for data frames; 0 bytes for remote frames.	0–64
CRC	CRC code. A 15-bit CRC code plus a recessive (1) delimiter bit.	16
Ack	Acknowledgment. A dominant (0) bit sent by nodes receiving the frame plus a	2
	recessive (1) delimiter bit.
End of frame	7 recessive (1) bits mark the end of a frame.	7
	Minimum extended message frame length (bits)	64–128

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