2位十进制计数器数码管显示设计VHDL代码modelsim仿真

名称：2位十进制计数器数码管显示设计VHDL代码modelsim仿真

软件：modelsim

语言：VHDL

代码功能：

2位十进制计数器数码管显示

1、计数0~99，计数到99回0

2、使用数码管显示

FPGA代码Verilog/VHDL代码资源下载：www.hdlcode.com

演示视频：

设计文档：

计数器

1. 程序文件

2. Testbench

3. 程序编译

4. 仿真图

复位清零

计数到99回到0 重新开始

数码管输出对应编码

数字锁

部分代码展示:

LIBRARY?ieee;
???USE?ieee.std_logic_1164.all;
???USE?ieee.std_logic_unsigned.all;
ENTITY?counter?IS
???PORT?(
??????clk?????:?IN?STD_LOGIC;
??????reset???:?IN?STD_LOGIC;
??????digit1??:?OUT?STD_LOGIC_VECTOR(7?DOWNTO?0);
??????digit2??:?OUT?STD_LOGIC_VECTOR(7?DOWNTO?0)
???);
END?counter;
ARCHITECTURE?behave?OF?counter?IS
???
???SIGNAL?cnt_10?????:?STD_LOGIC_VECTOR(3?DOWNTO?0)?:=?"0000";--计数器十位
???SIGNAL?cnt_1??????:?STD_LOGIC_VECTOR(3?DOWNTO?0)?:=?"0000";--计数器个位
???
???SIGNAL?digit1_Hex?:?STD_LOGIC_VECTOR(7?DOWNTO?0)?:=?"00000000";
???SIGNAL?digit2_Hex?:?STD_LOGIC_VECTOR(7?DOWNTO?0)?:=?"00000000";
BEGIN
???PROCESS?(clk,?reset)
???BEGIN
??????IF?(reset?=?'1')?THEN
?????????cnt_10?<=?"0000";
?????????cnt_1?<=?"0000";
??????ELSIF?(clk'EVENT?AND?clk?=?'1')?THEN
?????????IF?(cnt_10?=?"1001"?AND?cnt_1?=?"1001")?THEN--计数到99时回0
????????????cnt_10?<=?"0000";
????????????cnt_1?<=?"0000";
?????????ELSIF?(cnt_1?=?"1001")?THEN--个位记到9以后十位进1
????????????cnt_10?<=?cnt_10?+?"0001";
????????????cnt_1?<=?"0000";
?????????ELSE
????????????cnt_10?<=?cnt_10;
????????????cnt_1?<=?cnt_1?+?"0001";--计个位
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???--7段数码管显示，低电平点亮，
???--第7位为小数点，第6位为g，第5位为f，第4位为e，
???--第3位为d，第2位为c，第1位为b，第0位为a，
???
???--数码管1
???PROCESS?(cnt_1)
???BEGIN
??????CASE?cnt_1?IS
?????????WHEN?"0000"?=>
????????????digit1_Hex?<=?"11000000";
?????????WHEN?"0001"?=>
????????????digit1_Hex?<=?"11111001";
?????????WHEN?"0010"?=>
????????????digit1_Hex?<=?"10100100";
?????????WHEN?"0011"?=>
????????????digit1_Hex?<=?"10110000";
?????????WHEN?"0100"?=>
????????????digit1_Hex?<=?"10011001";
?????????WHEN?"0101"?=>
????????????digit1_Hex?<=?"10010010";
?????????WHEN?"0110"?=>
????????????digit1_Hex?<=?"10000010";
?????????WHEN?"0111"?=>
????????????digit1_Hex?<=?"11111000";
?????????WHEN?"1000"?=>
????????????digit1_Hex?<=?"10000000";
?????????WHEN?"1001"?=>
????????????digit1_Hex?<=?"10011000";
?????????WHEN?OTHERS?=>
????????????digit1_Hex?<=?"11000000";
??????END?CASE;

点击链接获取代码文件：http://www.hdlcode.com/index.php?m=home&c=View&a=index&aid=1121