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srec_motorola(5) File Formats Manual srec_motorola(5)
NAME
srec_motorola - Motorola S-Record hexadecimal file format
DESCRIPTION
This format is also known as the Exorciser, Exormacs or Exormax format.
Motorola's S-record format allows binary files to be uploaded and downloaded between two computer systems. This type of format is widely
used when transferring programs and data between a computer system (such as a PC, Macintosh, or workstation) and an emulator or evaluation
board for Motorola microcontrollers and microprocessors.
The Lines
Most S-Record file contain only S-Record lines (see the next section), which always start with a capital S character. Some systems gener-
ate various "extensions[rq] which usually manifest as lines which start with something else. These "extension[rq] lines may or may not
break other systems made by other vendors. Caveat emptor.
The Fields
The S-Record format consists of 5 fields. These are the type field, length field, address field, data field, and the checksum. The lines
always start with a capital S character.
+--+------+---------------+---------+------+----------+
|S | Type | Record Length | Address | Data | Checksum |
+--+------+---------------+---------+------+----------+
Type The type field is a 1 character field that specifies whether the record is an S0, S1, S2, S3, S5, S6, S7, S8 or S9 field.
Record Length
The record length field is a 2 character (1 byte) field that specifies the number of character pairs (bytes) in the record, exclud-
ing the type and record length fields.
Address This is a 2-, 3- or 4-byte address that specifies where the data in the S-Record is to be loaded into memory.
Data The data field contains the executable code, memory-loadable data or descriptive information to be transferred.
Checksum
The checksum is an 8-bit field that represents the least significant byte of the one's complement of the sum of the values repre-
sented by the pairs of characters making up the record's length, address, and data fields.
Record Types
S0 This type of record is the header record for each block of S-Records. The data field may contain any descriptive information iden-
tifying the following block of S-Records. (It is commonly "HDR[rq] on many systems.) The address field is normally zero.
S1 A record containing data and the 2-byte address at which the data is to reside.
S2 A record containing data and the 3-byte address at which the data is to reside.
S3 A record containing data and the 4-byte address at which the data is to reside.
S5
An optional record containing the number of S1, S2 and S3 records transmitted in a particular block. The count appears in the two-
byte address field. There is no data field.
This record is optional, you do not have to use it. Nobody knows if you can have more than one in a file; and if you do, nobody
knows whether or not the line count resets after each one.
The srec_cat command will only ever use one, provided the number of lines fits in 16 bits, otherwise it will use S6.
S6
An optional record containing the number of S1, S2 and S3 records transmitted in a particular block. The count
appears in the three-byte address field. There is no data field.
This record is optional, you do not have to use it. Nobody knows if you can have more than one in a file; and if
you do, nobody knows whether or not the line count resets after each one.
Nobody knows what happens if you mix S5 and S6 records in a file.
The srec_cat command will only ever use one, provided the number of lines fits in 24 bits.
S7 A termination record for a block of S3 records. The address field may contain the 4-byte address of the instruction
to which control is passed. There is no data field.
S8 A termination record for a block of S2 records. The address field may optionally contain the 3-byte address of the
instruction to which control is passed. There is no data field.
S9 A termination record for a block of S1 records. The address field may optionally contain the 2-byte address of the
instruction to which control is passed. If not specified, the first entry point specification encountered in the
object module input will be used. There is no data field.
Size Multiplier
In general, binary data will expand in sized by approximately 2.4 times when represented with this format.
EXAMPLE
Here is an example S-Record file. It contains the data "Hello, World[rq] to be loaded at address 0.
S00600004844521B
S110000048656C6C6F2C20576F726C640A9D
S5030001FB
S9030000FC
COPYRIGHT
srec_cat version 1.58
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Peter Miller
The srec_cat program comes with ABSOLUTELY NO WARRANTY; for details use the 'srec_cat -VERSion License' command. This is free software and
you are welcome to redistribute it under certain conditions; for details use the 'srec_cat -VERSion License' command.
AUTHOR
Peter Miller E-Mail: pmiller@opensource.org.au
//* WWW: http://miller.emu.id.au/pmiller/
Reference Manual SRecord srec_motorola(5)
