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


Table 97: ReadMemoryByAddress (memoryAddress, memorySize > 3 bytes)



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Table 97: ReadMemoryByAddress (memoryAddress, memorySize > 3 bytes) 
T = Frame Sent By Tester, N = Frame Sent By Node; shaded region indicates PCI 
Frame Type 
CAN Id 
#1 
#2 
#3 
#4 
#5 
#6 
#7 
#8 
T(USDT-SF) 
$241 
$06 
$23 
$01 
$11 
$02 
$00 
$0F 
--- 
N(USDT-FF) 
$641 
$10 
$13 
$63 
$01 
$11 
$02 
$34 
$56 
T(USDT-FC) 
$241 
$30 
$00 
$00 
--- 
--- 
--- 
--- 
--- 
N(USDT-CF) 
$641 
$21 
$78 
$9A 
$BC 
$DE 
$F0 
$12 
$34 
N(USDT-CF) 
$641 
$22 
$56 
$78 
$9A 
$BC 
$DE 
$F0 
--- 
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 122 of 336 
8.7.6 Node Interface Function. 
8.7.6.1 Node Interface Data Dictionary (Table 98). 
Table 98: Node Interface Data Dictionary of ReadMemoryByAddress Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length 
Security_Access_Unlocked
Reference 
Common/Global 
Pseudo Code Data Dictionary 
For 
Definition 
Of 
These 
Flags/Variables 
Bad_Address 
Status flag that indicates whether any of the range of addresses in the 
request is not valid. 
TRUE/FALSE 
memoryAddress 
This is the starting address in ECU memory from the request message. 
Varies based on ECU 
MemorySize 
This is the number or consecutive memory addresses that the tester has 
requested (parameter of request message). 
$01 to maximum size, where 
maximum size is the lesser of 
the NWL buffer size or 4094 
minus the number of bytes in 
the memoryAddress parameter 
Memory_Address 
This is a local variable used to point to ECU memory when indexing through 
the requested addresses to determine if any portion of the requested memory 
is invalid, protected, or requires security access. The pseudo code uses 
Memory_Address.data to reflect the contents of a given memory address. 
Varies based on ECU 

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