User's Manual

Part 1 − Universal Socket Connectivity Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342K) 31
Other Supported Boot Code Commands
2.1 ATI0 - returns 000 or 247 for ISDN
2.2 ATI1 - returns boot code version number MM.mmn where
MM = unique code for each different platform that has boot code
mm = version number of boot code
n = version letter of the boot code
Examples: 2.05e, 2.12d, 35.15
ATI4- Boot code date and time.
Other Programming Concerns
1. The packets sent to the modem must be presorted by address and aligned on 128 byte boundaries (i.e., each
packet must start on an address that is a multiple of 128).
2. The packets should also be a minimum of 128 bytes with the non-programmed bytes set to the hex value of FF.
3. The packets sent to the modem must not span a 4K boundary (i.e., start the packet before it and go over the
boundary in the middle of the packet).
4. The 10-millisecond delay between M’s at the beginning of the handshake is so that the modem can sync up to
the start bit. If the M’s are sent one right after another, a data bit might be mistaken as a start bit.
5. Multi-Tech firmware files are in Intel Hex Format and must be read in and formatted into 128-4096 byte blocks
before being sent to the modem.
Information about the Intel Hex Format
An Intel Format Hex File is a text file consisting of “records”, one per line, that start with a “:” character and include
only digits 0-9 and letters A-F. There are three different record types: Extended Address Records, Data Records, and
End of File Records.
Data records contain the actual data that is to be programmed into a device. The address contained in the data
record needs to be combined with an extended address (by adding the extended address shifted four bits left to the
data record address) to determine the actual programming address for the data. If no extended address record is
before a given data record in the file, then the extended address value is assumed to be zero.
Data Record
Char Pos Field Type
V
alue Description
1 Record Start “:”
2-3 Data Byte Count “NN” Maximum value is FF (which is 255 data bytes).
Typical is 20h which causes the hex record to fit in 80
columns.
4-7 Address “XXXX” Lower 16 bits of 20 bit address, most significant byte
first. This must be added to Extended Address left
shifted four bits.
8-9 Record Type “00” Data Record
10+N Data Bytes “YY..YY
”
The data bytes in hex. Each byte is two characters.
NN+1,2 Checksum “ZZ” Zero minus the two’s complement addition of all data
hex values.
NN+3,4 End of Line “\r\n” Carriage Return followed by a Line Feed
Example Data Record in Intel Format
:2000A0005BB66DDBB66CD8B060C183060D1B366DDBB66DDBB76FDFBF7EFDFBF6EDDBB66DD4