Interpreters Document



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dps Interpreters

Request 
Byte
Value 
Byte Description 

XX 
Data byte 1 


The pseudo code below explains how the data portion of this request is 
filled 
5 + N 
XX 
Data byte N (N <= 254) 
6 + N 
CS 
1 byte request checksum
Endif
Do while more routine to download
If this is the last packet of the routine
Change request length (byte 4) to size of last packet 
Copy the remaining routine into the data area of buffer 
Else
Copy the next packet of routine into the data area of buffer starting at byte 6 or 10 
Endif 
Calculate checksum and copy into the Transfer Data Service Request
If AC3 is $40 or $41 
Build Transfer Data Request as indicated below 
Request 
Byte
Value 
Byte Description 

80 
Format byte for physical addressing 

## 
Global target byte 

## 
Global source byte 

12 
Length of request from byte 5 up to checksum (not included) 

34 
Request Download Request Service ID

XX 
Global address - High byte

XX 
Global address - Middle byte

XX 
Global address - Low byte

00 
Data Format Identifier 
10 
XX 
Uncompressed memory size - high byte
11 
XX 
Uncompressed memory size - middle byte
12 
XX 
Uncompressed memory size - low byte
Note: 
Increment Global address 
If remaining data is less, use number of remaining bytes for Uncompressed memory size 
Calculate checksum and copy into the Request Download service request
Send the Request Download request and expect a response 
If an error occurred
End the routine download
Endif 
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Page
147 
Endif 
(continued) 
Send the Transfer Data Request and expect a response (up to 10 bytes) 
If AC3 is $00 or $40 
Calculate the next download address 
Copy the next download address in the Service Request
Endif 
If an error occurred
End the routine download
Endif 
If AC3 is $40 or $41 
Build Request Transfer Exit Request as indicated below 

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