Страница 1 мировой engineering стандарты общая спецификация

8.12.6 Node Interface Function.
8.12.6.1 Node Interface Data Dictionary (Table 137).
Table 137: Node Interface Data Dictionary of RequestDownload Service Pseudo Code
Variable/Meaning
Values
message_data_length
Security_Access_Unlocked
TransferData_Allowed
Reference Common/Global
Pseudo Code Data Dictionary
For Definition Of These
Flags/Variables
programming_mode_active
This is a flag used to keep track of whether or not a programming event has
been enabled.
YES/NO
8.12.6.2 Node Interface Pseudo Code.
Powerup States:
None
Each time a $34 message is received and the ECU is currently executing the operational software, the
following logic is executed:
BEGINFUNCTION Serv_34_Msg_Recvd()
IF ((message_data_length is invalid) OR (dataFormatIdentifier is invalid) OR ((dataFormatIdentifier != $00)
AND (unCompressedMemory size is invalid))) THEN
send Negative Response($7F $34 $12) /* Invalid Format */
ELSE
/* The security access check below only applies to ECUs which support security access */
/* the check below for a download in progress is only required for ECUs that do not have boot software. If
the ECU supports a boot then this check would be handled out of the service $34 boot code */
IF ((Security_Access_Unlocked = FALSE) OR (programming_mode_active = NO) OR (a software or
calibration module download is in progress)) THEN
send Negative Response ($7F $34 $22) /* for conditionsNotCorrect */
ELSE
IF (more than P2
C 
ms is needed to process this request) THEN
send Negative Response ($7F $34 $78) /* RequestCorrectlyReceived-ResponsePending */
ENDIF
/* at this time the module shall do whatever is necessary to prepare for transferring program control to
the boot software (if the ECU supports boot software) for module programming.*/
IF (DTC for Flash or EEPROM checksum failure is set) THEN
send Negative Response ($7F $34 $99) /*ReadyForDownload-DTCStored */
ELSE
send ($74) response message
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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