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9.3.3.1.1 Examples of Software/Calibration File Headers. 
In the first example, the boot software is utilizing
the PMA information provided in the header of the calibration module to determine the ECU physical
addresses for programming. The data within a calibration module will occupy two memory regions in the ECU
according to Figure 37. The start address of memory region 1 is $8000 and the length is $1000 bytes. The
start address of memory region 2 is $A500 and the length is $0B00 bytes. The calibration module part number
is used as the SWMI and is stored in the header in 4 byte hexadecimal format. The Design Level Suffix or
Alpha Code is stored in 2-byte ASCII format. See Figure 37.
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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Figure 37: Calibration Module Consisting Of Two Memory Regions
The header for this example would contain the following information (Table 222):
Memory
Region
1
Void
Memory
Region
Memory
Region
2
$8000
$9000
$A500
$B000
Calibration Module
• Module Id = $02
• Part # = 12345678
• Alpha Code = AA

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Table 222: Calibration Module Header Data for Example 1
Offset
Number
of bytes
Description
$00
2
Module checksum or CRC (hex) = $xx xx
$02
2
Module ID = $00 02
$04
1
Header Format Identifier = $21
$05
4
SWMI (part # 12345678) = $00 BC 61 4E
$09
2
Alpha Code = AA ($41 41)
$0B
1
NOAR = $02
$0C
4
Start address of 1
st 
memory region = $00 00 80 00
$10
4
Length of 1
st 
memory region = $00 00 10 00
$14
4
Start address of 2
nd 
memory region = $00 00 A5 00
$18
4
Length of 2
nd 
memory region = $00 00 0B 00
In the next example, the boot software determines the address information for the software and calibration
modules from information stored in the software module header. The ECU is broken up into three modules
(one operational software module and two calibration modules) as depicted in Figure 38.
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