Interpreters Document



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dps Interpreters

Utility File Structure 
The Utility File is one contiguous block of data consisting of three distinct sections as depicted below: 
 
 
 
Header Information 
(24 bytes) 
Used to setup the programming session
 
 
The Header Information defines information that remains 
constant during the entire reprogramming event. An example 
of this information is the "Type of Interpreter", once the 
software starts using an Interpreter it will not change to an 
Interpreter using another communications protocol. 
 
 
 
Interpreter
Instructions 
A set of sequentially numbered steps to 
control the programming session
 
 
 
The Interpreter Instructions are the Op-Codes that guide the 
terminal application through a reprogramming event. Each 
instruction line is 16 bytes long and consists of four sections: 
1 byte Step Number, 1 byte Op-Code, 4 byte Action Field, and 
10 bytes of goto fields. 
 
 
Device (ECU) Specific
Control Routines
and / or Service Request 
Data Routine
 
 
The Device Specific Control Routines are programming 
routines used for performing various functions during the 
reprogramming event. The number of routines varies
depending on how each ECU. Examples of control routines 
are: erase flash memory, turn on reprogramming voltage, or 
read flash manufacturer and ID. 
Service Request Data Routines provide a means to pass 
additional data in Service Request. Examples of this data are 
Routine Entry Options and Record Values.
Even though the Utility File is viewed as three sections, it must be handled as a single file. The following 
subsections, Format of Header Information, Format of Interpreter Instructions and Format of Device Specific 
Programming Routines, provide greater insight to the design of the three sections of the Utility File. The 
routine section of the utility file is an optional section and is controller specific. 
 
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