MATLAB生成*.mif、*.hex2008-08-31 03:06做FPGA设计时经常要调用芯片内存。特别对于ROM,内存的初始化就显得比较重要。当然你完全可以手工在QUARTUS II打开mif文件的表格里或是在EXCEL中逐个输入,几十项(字)或是近百项(字)你还可以接受,如果上千项或是更多呢?估计能累的人吐血!' d" Q7 K/ F4 R6 R/ p9 b) H
3 p& w, ?! e0 n一般内存的初始化数据都是有规律的,符合一定的函数,我们完全可以用MATLAB来完成(如果没规律只能逐项手工输入了)。 : v1 v! Y+ j( }6 k; _+ h% N6 Z1 \* M) r+ ?6 J) M- w
首先,我们应该知道*.mif文件的格式。它是文本格式。随便打开一个mif文件,你会发现它具有如下的格式: * a: y" A4 s+ f' u ' M ]* e8 A; c% C2 L7 I* t4 v; v . R6 @* h: F. c5 V! ]/ _
-- Copyright (C) 1991-2007 Altera Corporation
-- Your use of Altera Corporation's design tools, logic functions
-- and other software and tools, and its AMPP partner logic
-- functions, and any output files from any of the foregoing
-- (including device programming or simulation files), and any
-- associated documentation or information are expressly subject
-- to the terms and conditions of the Altera Program ******
-- Subscription Agreement, Altera MegaCore Function ******
-- Agreement, or other applicable ****** agreement, including,
-- without limitation, that your use is for the sole purpose of
-- programming logic devices manufactured by Altera and sold by
-- Altera or its authorized distributors. Please refer to the
-- applicable agreement for further details.
-- Quartus II generated Memory Initialization File (.mif)
WIDTH=8;
DEPTH=256;
ADDRESS_RADIX=UNS;
DATA_RADIX=UNS;
CONTENT BEGIN
0:127;
1:126;
2:126;
……
……
253:126;
254:126;
255:127;
END;6 N6 E' }7 E* ~
格式很简单吧。首先根据需要设置每个字的位宽WIDTH和总字数DEPTH。然后设置地址和数据的进制基数ADDRESS_RADIX、DATA_RADIX,建议大家不要修改,就使用无符号数(UNS)。然后用MATLAB生成需要的数据(按上边的格式,注意中间“:”,最后“;”),往CONTENT BEGIN和END中间一贴就行了。, P9 Q, y' |; K+ R
! |' @# |/ h" U, j/ J, [; M" [下边举例说明MATLAB程序的写法,希望对大家有用$ J1 S& k, H/ Z2 C" e8 K0 A) ]4 d- s2 w