General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

 
 
Note:
Each network layer timing parameter (N_Ax, N_Bx, and N_Cx) is specified from the perspective of both 
the sender of a multi-frame message (e.g., N_As) and the receiver of a multi-frame message (e.g., N_Ar). 
Timeout values define the amount of time a sender or a receiver must wait for the expected frame before 
notifying the application of an error condition, and assume that the sender is not transmitting other messages 
of higher priority than the diagnostic messages. Performance requirements are the timing requirements placed 
on the sender of a specified frame. A detailed description of the network layer timing parameters can be found 
in ISO 15765-2 and OSEK/COM specification. 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
CameraLoops.com

---

GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 66 of 336 
6.3.2 Tester Network Layer Flow Control Frame Transmit Parameter Requirements. 
A GMLAN tester 
shall support the Network Layer parameters defined in Table
 
36 when transmitting flow control frames. The 
values described in the table are the minimum requirements for the ECU to support when receiving a flow 
control frame. See Figures 31 and 32. The ECU may support flow control parameter values over and above 
the minimum specified. However, any time an ECU receives a flow control frame with parameter values that 
the ECU does NOT support, the ECU shall treat the received frame as an invalid frame and discard it. The 
ECU shall continue to wait for a valid flow control frame until one is received, or the network layer N_Br timeout 
occurs. See Tables 37 and 39. 
Table 36: Tester Network Layer Network Layer Parameter Values