srec_aomf(5)							File Formats Manual						      srec_aomf(5)

NAME

       srec_aomf - Intel Absolute Object Module Format

DESCRIPTION

       The  Absolute  Object Module Format (AOMF) is a subset of the 8051 OMF.	The structure of an absolute object file (the order of the records
       in it) is similar to that of a relocatable object file.	There are three main differences:  the first is that an absolute object file  con-
       tains one module only, the second is that not all the records can appear in the absolute file and the third is that the records can contain
       only absolute information.

   Generic Record Format
       Each record starts with a record type which indicates the type of the record, and record length which contain the number of  bytes  in  the
       record  exclusive of the first two fields. The record ends with a checksum byte which contains the 2s complement of the sum (modulo 256) of
       all other bytes in the record.  Therefore the sum (modulo 256) of all bytes in the record is zero.

       The record length includes the payload and checksum fields, but excludes the type and length fields.

       All 16-bit fields are little-endian.

							 +--------+---------+---------+---------+
							 |REC	  | Record  | Payload | CHK	|
							 |TYP	  | Length  |	      | SUM	|
							 |8 bits  | 16 bits |	      | 8 bits	|
							 +--------+---------+---------+---------+
       Here are some of the relevant record types:

							    0x01   Scope Definition Record
							    0x02   Module Start Record
							    0x04   Module End Record
							    0x06   Content Record
							    0x0E   Segment Definition Record
							    0x12   Debug Items Record
							    0x16   Public Definition Record
							    0x18   External Definition Record

       Names are not stored a C strings.  Names are stored as a length byte followed by the contents.

   Structure
       An AOMF file consists of a module header record (0x02), followed by one or more content (0x06), scope (0x01) or debug (0x12)  records,  and
       ends in a module end record (0x04).

       The  records  with  the	following  types  are  extraneous  (they may appear in the file but are ignored):  0x0E, 0x16 and 0x18 (definition
       records).  All records which are not part of the AOMF and are not extraneous are considered erroneous.

   Module Header Record
					       +--------+---------+---------+---------+---------+---------+
					       | REC	| Record  | Module  | TRN ID  | zero	| CHK	  |
					       | TYP	| Length  | Name    | 8 bits  | 8 bits	| SUM	  |
					       | 0x02	| 16 bits |	    |	      | 	| 8 bits  |
					       +--------+---------+---------+---------+---------+---------+
       Each module must starts with a module header record.  It is used to identify the module for the RL51 and other future  processors  of  8051
       object files.  In addition to the Module Name the record contains:

       TRN ID  The byte identifies the program which has generated this module:

									 0xFD	ASM51
									 0xFE	PL/M-51
									 0xFF	RL51.

   Module End Record
					  +--------+---------+---------+---------+---------+---------+---------+
					  | REC    | Record  | Module  | zero	 | REG	   | zero    | CHK     |
					  | TYP    | Length  | Name    | 16 bits | MSK	   | 8 bits  | SUM     |
					  | 0x04   | 16 bits |	       |	 | 8 bits  |	     | 8 bits  |
					  +--------+---------+---------+---------+---------+---------+---------+
       The record ends the module sequence and contains the following information:  characteristics

       MODULE NAME
	       The name of the module is given here for a consistency check.  It must match the name given in the Module Header Record.

       REGISTER MASK (REG MSK)
	       The  field contains a bit for each of the four register banks.  Each bit, when set specifies that the corresponding bank is used by
	       the module:

	       Bit 0 (the least significant bit)
		       bank #0.

	       Bit 1   bank #1.

	       Bit 2   bank #2.

	       Bit 3   bank #3.

   Content Record
					       +--------+---------+---------+---------+---------+---------+
					       | REC	| Record  | SEG ID  | Offset  |  DATA	| CHK	  |
					       | TYP	| Length  | 8 bits  | 16 bits | 	| SUM	  |
					       | 0x06	| 16 bits |	    |	      | 	| 8 bits  |
					       +--------+---------+---------+---------+---------+---------+
       This record provides one or more bytes of contiguous data, from which a portion of a memory image may be constructed.

       SEG ID  This field must be zero.

       OFFSET  Gives the absolute address of the first byte of data in the record, within the CODE address space.

       DATA    A sequence of data bytes to be loaded from OFFSET to OFFSET+RECORDLENGTH-5.

   Size Multiplier
       In general, raw binary data will expand in sized by approximately 1.02 times when represented with this format.

SOURCE

       http://www.intel.com/design/mcs96/swsup/omf96_pi.pdf
       ftp://download.intel.com/design/mcs51/SWSUP/omf51.exe (zip archive)
       http://www.elsist.net/WebSite/ftp/various/OMF51EPS.pdf

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_aomf(5)