XC161 Datasheet, PDF (334/419 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller with C166SV2 Core Volume 2 (of 2): Peripheral Units

XC161 Derivatives
Peripheral Units (Vol. 2 of 2)
Serial Data Link Module SDLM
22.2.1.1 Frame Format Basics
This chapter summarizes the basic definitions of the SAE Standard Class B Data
Communication Network Interface protocol.
The general J1850 frame format is defined as:
idle, SOF, DATA_0, …, Data_N, CRC, EOD, NB, IFR_1, …, IFR_N, EOF, IFS, idle
Type 0 : No IFR
Header
Data Field
CRC
IFS
Type 1 : Single Byte From A Single Responder
Header
Data Field
CRC EOD NB ID
IFS
Type 2 : Single Byte From Multiple Responders
Header
Data Field
CRC EOD NB ID 1
...........
ID N
IFS
Type 3 : Multiple Bytes From A Single Responder
Header
Data Field
CRC EOD NB
IFR Data Field
CRC
(when NB is active long)
IFS
Figure 22-2 Standard Frame Types
Table 22-1 summarizes the used abbreviations.
User’s Manual
SDLM_X, V2.0
22-3
V2.2, 2004-01