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



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n
umber 
o

b
ytes to be sent starting with the 
address of the 2
nd
memory region. 

:
:
 
:

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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 264 of 336 
Offset 
Number 
of Bytes 
Name 
Description 
Cvt 
End of 
previous 
field 
+ 1 

PMA#n 
This optional field is present if the PMA bit of the HFI is set to 
a one and the NOAR field indicates that there are (n) 
address regions (where n > 2) contained within the module. 
This field would contain the starting address of the n
th
memory region. 

End of 
previous 
field 
+ 1 

NOB#n 
This optional field contains the 
n
umber 
o

b
ytes to be sent 
starting with the address of the n
th
memory region. 

End of 
previous 
field 
+ 1 

NOAM 
The 
N
umber 
O

A
dditional 
M
odules optional field is only 
present if this header includes the address information of all 
software/calibration modules to be downloaded into the ECU 
(MPFH and PMA bits of HFI must be a 
“1”). This 2-byte value 
represents the number of additional calibration modules for 
which this header includes the address information. 

End of 
previous 
field 
+ 1 

DCID_am1 
This optional field is present if the H_N
Size
bit of the HFI is 1, 
and the DCID bit in the HFI field is also a 1. This field is two 
bytes in length and contains a Data Compatibility identifier 
value for the first additional module. This value is compared 
by the programming executive against a corresponding value 
in the calibration data file header (DCID_) to ensure that 
there is no mismatch between the calibration file and the 
operational software. 

End of 
previous 
field 
+ 1 

NOAR_am1 
This field is optional and is only present if the NOAM field is 
≥ 1. The data represents the number of address regions of 
the first additional module.

End of 
previous 
field 
+ 1 

PMA#1_am1 This optional field contains the starting 

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