Provided by: srecord_1.64-4.1build1_amd64 
NAME
srec_mif - Memory Initialization File (MIF) format
DESCRIPTION
This format was invented by Altera.
An ASCII text file (with the extension .mif) that specifies the initial content of a memory block (CAM,
RAM, or ROM), that is, the initial values for each address. This file is used during project compilation
and/or simulation. You can create a Memory Initialization File in the Memory Editor, the In‐System Memory
Content Editor, or the Quartus II Text Editor.
A Memory Initialization File serves as an input file for memory initialization in the Compiler and
Simulator. You can also use a Hexadecimal (Intel‐Format) File (.hex) to provide memory initialization
data.
A Memory Initialization File contains the initial values for each address in the memory. A separate file
is required for each memory block. In a Memory Initialization File, you must specify the memory depth and
width values. In addition, you can specify data radixes as binary (BIN), hexadecimal (HEX), octal (OCT),
signed decimal (DEC), or unsigned decimal (UNS) to display and interpret addresses and data values. Data
values must match the specified data radix.
When creating a Memory Initialization File in the Quartus II Text Editor, you must start with the DEPTH,
WIDTH, ADDRESS_RADIX and DATA_RADIX keywords. You can use Tab "" and Space " " characters as separators,
and insert multiple lines of comments with the percent "%" character, or a single comment with double
dash "--" characters. Address:data pairs represent data contained inside certain memory addresses and
you must place them between the CONTENT BEGIN and END keywords, as shown in the following examples.
% multiple‐line comment
multiple‐line comment %
-- single‐line comment
DEPTH = 8; -- The size of data in bits
WIDTH = 32; -- The size of memory in words
ADDRESS_RADIX = HEX; -- The radix for address values
DATA_RADIX = BIN; -- The radix for data values
CONTENT -- start of (address : data pairs)
BEGIN
00 : 00000000; -- memory address : data
01 : 00000001;
02 : 00000010;
03 : 00000011;
04 : 00000100;
05 : 00000101;
06 : 00000110;
07 : 00000111;
08 : 00001000;
09 : 00001001;
0A : 00001010;
0B : 00001011;
0C : 00001100;
END;
There are several ways to specify the address and data, as seen in the following table:
Notation Interpretation Example
A : D; Addr[A] = D 2 : 4
Address: 01234567
Data: 00400000
[A0..A1] : D; Addr[A0] to [A1] contain [0..7] : 6
(See note below.) data D Address: 01234567
Data: 66666666
[A0..A1] : D0 D1; Addr[A0] = D0, [0..7] : 5 6
(See note below.) Addr[A0+1] = D1, Address: 01234567
Addr[A0+2] = D0, Data: 56565656
Addr[A0+3] = D1,
until A0+n = A1
A : D0 D1 D2; Addr[A] = D0, 2 : 4 5 6
Addr[A+1] = D1, Address: 01234567
Addr[A+2] = D2 Data: 00456000
Note: The address range forms are limited in SRecord, the range must be less than 255 bytes. SRecord
will never write an address range.
Note: When reading MIF file, SRecord will round up the number of bits in the WIDTH to be a multiple of 8.
Multi‐byte values will be laid down in memory as big‐endian.
An ASCII text file (with the extension .mif) that specifies the initial content of a memory block (CAM,
RAM, or ROM), that is, the initial values for each address. This file is used during project compilation
and/or simulation. A MIF contains the initial values for each address in the memory. In a MIF, you are
also required to specify the memory depth and width values. In addition, you can specify the radixes
used to display and interpret addresses and data values.
SIZE MULTIPLIER
In general, binary data will expand in sized by approximately 3.29 times when 8‐bit data is represented
with this format (16 bit = 2.75, 32 bit = 2.47, 64 bit = 2.34).
EXAMPLE
Following is a sample MIF:
DEPTH = 32; % Memory depth and width are required %
% DEPTH is the number of addresses %
WIDTH = 14; % WIDTH is the number of bits of data per word %
% DEPTH and WIDTH should be entered as decimal numbers %
ADDRESS_RADIX = HEX; % Address and value radixes are required %
DATA_RADIX = HEX; % Enter BIN, DEC, HEX, OCT, or UNS; unless %
% otherwise specified, radixes = HEX %
--Specify values for addresses, which can be single address or range
CONTENT
BEGIN
[0..F]: 3FFF; % Range: Every address from 0 to F = 3FFF %
6 : F; % Single address: Address 6 = F %
8 : F E 5; % Range starting from specific address %
-- % Addr[8] = F, Addr[9] = E, Addr[A] = 5 %
END;
REFERENCE
The above information was gleaned from the following sources:
http://www.altera.com/support/software/nativelink/quartus2/glossary/def_mif.html
http://www.mil.ufl.edu/4712/docs/mif_help.pdf
COPYRIGHT
srec_mif version 1.64
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012,
2013, 2014 Peter Miller
The srec_mif program comes with ABSOLUTELY NO WARRANTY; for details use the 'srec_mif -VERSion License'
command. This is free software and you are welcome to redistribute it under certain conditions; for
details use the 'srec_mif -VERSion License' command.
MAINTAINER
Scott Finneran E‐Mail: scottfinneran@yahoo.com.au
Peter Miller E‐Mail: pmiller@opensource.org.au
Reference Manual SRecord srec_mif(5)