PS：Visio-更多形状-工程-电气工程-模拟和数字逻辑-信号波形 里面有正弦波、方波等信号波形。
（1）key_ctrl部分Verilog代码：
module key_ctrl
(input clk ,input reset_n ,input [3:0] key ,output reg [3:0] wave_selcet
);wire key_p_sin;wire key_p_squ;wire key_p_tri;wire key_p_saw;key_filter key_filter_inst0(.clk (clk ),.reset_n (reset_n ),.key_in (key[0] ),.key_p_flag (key_p_saw ),.key_r_flag (),.key_state ()
);key_filter key_filter_inst1(.clk (clk ),.reset_n (reset_n ),.key_in (key[1] ),.key_p_flag (key_p_tri ),.key_r_flag (),.key_state ()
);key_filter key_filter_inst2(.clk (clk ),.reset_n (reset_n ),.key_in (key[2] ),.key_p_flag (key_p_squ ),.key_r_flag (),.key_state ()
);key_filter key_filter_inst3(.clk (clk ),.reset_n (reset_n ),.key_in (key[3] ),.key_p_flag (key_p_sin ),.key_r_flag (),.key_state ()
);always@(posedge clk or negedge reset_n)if(!reset_n)wave_selcet <= 4'b1000;else if(key_p_sin)wave_selcet <= 4'b1000;else if(key_p_squ)wave_selcet <= 4'b0100;else if(key_p_tri)wave_selcet <= 4'b0010;else if(key_p_saw)wave_selcet <= 4'b0001;else wave_selcet <= wave_selcet;endmodule
（2）仿真代码：
`timescale 1ns / 1psmodule key_ctrl_tb;reg clk ;
reg reset_n ;
reg [3:0]key ; wire [3:0]wave_selcet ;initial clk = 1'd1;
always#10 clk = ~clk;initial beginreset_n <= 1'd0;key <= 4'd1111;#15;reset_n <= 1'd1;#50000;key <= 4'b1110;#50000;key <= 4'b1111;#50000;key <= 4'b1101;#50000;key <= 4'b1111;#50000;key <= 4'b1011;#50000;key <= 4'b1111;#50000;key <= 4'b0111;#50000;key <= 4'b1111;#50000;$stop;
endkey_ctrl key_ctrl_inst
(.clk (clk ),.reset_n (reset_n ),.key (key ),.wave_selcet (wave_selcet)
);defparam key_ctrl_inst.key_filter_inst0.MCNT = 99;defparam key_ctrl_inst.key_filter_inst1.MCNT = 99;defparam key_ctrl_inst.key_filter_inst2.MCNT = 99;defparam key_ctrl_inst.key_filter_inst3.MCNT = 99;endmodule
（3）仿真波形：
（4）ROM配置过程：
例化模板：
附上生成coe文件的matlab源码（来自野火）：
clc; %清除命令行命令
clear all; %清除工作区变量,释放内存空间
F1=1; %信号频率
Fs=2^12; %采样频率
P1=0; %信号初始相位
N=2^12; %采样点数
t=[0:1/Fs:(N-1)/Fs]; %采样时刻
ADC=2^7 - 1; %直流分量
A=2^7; %信号幅度
s1=A*sin(2*pi*F1*t + pi*P1/180) + ADC; %正弦波信号
s2=A*square(2*pi*F1*t + pi*P1/180) + ADC; %方波信号
s3=A*sawtooth(2*pi*F1*t + pi*P1/180,0.5) + ADC; %三角波信号
s4=A*sawtooth(2*pi*F1*t + pi*P1/180) + ADC; %锯齿波信号
%创建coe文件
fild = fopen('wave_16384x8.coe','wt');
%写入coe文件头
fprintf(fild, '%s\n','MEMORY_INITIALIZATION_RADIX=10;'); %10进制数
fprintf(fild, '%s\n','MEMORY_INITIALIZATION_VECTOR=');
for j = 1:4for i = 1:Nif j == 1 %打印正弦信号数据s0(i) = round(s1(i)); %对小数四舍五入以取整endif j == 2 %打印方波信号数据s0(i) = round(s2(i)); %对小数四舍五入以取整endif j == 3 %打印三角波信号数据s0(i) = round(s3(i)); %对小数四舍五入以取整endif j == 4 %打印锯齿波信号数据s0(i) = round(s4(i)); %对小数四舍五入以取整endif s0(i) <0 %负1强制置零s0(i) = 0endif j == 4 && i == Nfprintf(fild, '%d',s0(i)); %数据写入fprintf(fild, '%s',';'); %最后一个数使用分号结束elsefprintf(fild, '%d',s0(i)); %数据写入fprintf(fild, '%s\n',','); %逗号，换行endend
end
fclose(fild);
