数字秒表VHDL实验箱验证精度毫秒可回看_电路方案

名称：数字秒表VHDL精度毫秒可回看（代码在文末付费下载）

软件：Quartus

语言：VHDL

代码功能：

数字秒表的VHDL设计，可以显示秒和毫秒。可以启动、停止、复位。要求可以存储6组时间，可以回看存储的时间。

本资源内含2个工程文件，两个工程文件功能相同，均能实现上述数字秒表功能，但是代码实现方式不同，详见下述设计文档_1和设计文档_2.

本代码已在实验箱验证，实验箱资料：

实验电路结构图及芯片引脚对应表(1).doc

演示视频：

FPGA代码资源下载网：hdlcode.com

部分代码展示

LIBRARY?ieee;
???USE?ieee.std_logic_1164.all;
???USE?ieee.std_logic_unsigned.all;
--秒表控制模块
ENTITY?control?IS
???PORT?(
??????clk_in??????????:?IN?STD_LOGIC;--1KHz
??????reset_p???????????:?IN?STD_LOGIC;--复位
??????key_1???????????:?IN?STD_LOGIC;--启动
??????key_2???????????:?IN?STD_LOGIC;--停止
??current_state:?OUT?STD_LOGIC_VECTOR(1?DOWNTO?0);--当前状态
??????Millisecond??:?OUT?STD_LOGIC_VECTOR(11?DOWNTO?0);--毫秒
??????Second???????:?OUT?STD_LOGIC_VECTOR(11?DOWNTO?0)--秒
???);
END?control;
ARCHITECTURE?RTL?OF?control?IS
???SIGNAL?state?:?STD_LOGIC_VECTOR(1?DOWNTO?0)?:=?"00";????--?创建信号???
???constant?S0:?STD_LOGIC_VECTOR(1?DOWNTO?0)?:=?"00";
???constant?S1:?STD_LOGIC_VECTOR(1?DOWNTO?0)?:=?"01";
???constant?S2:?STD_LOGIC_VECTOR(1?DOWNTO?0)?:=?"10";
???constant?S3:?STD_LOGIC_VECTOR(1?DOWNTO?0)?:=?"11";
???SIGNAL?num1?????:?STD_LOGIC_VECTOR(3?DOWNTO?0):=?"0000";
???SIGNAL?num2?????:?STD_LOGIC_VECTOR(3?DOWNTO?0):=?"0000";
???SIGNAL?num3?????:?STD_LOGIC_VECTOR(3?DOWNTO?0):=?"0000";
???SIGNAL?num4?????:?STD_LOGIC_VECTOR(3?DOWNTO?0):=?"0000";
???SIGNAL?num5?????:?STD_LOGIC_VECTOR(3?DOWNTO?0):=?"0000";
???SIGNAL?num6?????:?STD_LOGIC_VECTOR(3?DOWNTO?0):=?"0000";
???
???SIGNAL?haomiao_cnt:?STD_LOGIC_VECTOR(11?DOWNTO?0)?:=?"000000000000";
???SIGNAL?miao_cnt:?STD_LOGIC_VECTOR(11?DOWNTO?0)?:=?"000000000000";
BEGIN
???--计时状态机
???PROCESS?(clk_in)
???BEGIN
??????IF?(clk_in'EVENT?AND?clk_in?=?'1')?THEN
?????????IF?(reset_p?=?'1')?THEN--按下复位
????????????state?<=?S3;--复位状态
?????????ELSE
????????????CASE?state?IS
???????????????WHEN?S3?=>--复位状态
??????????????????state?<=?S0;
???????????????WHEN?S0?=>--空闲状态
??????????????????IF?(key_1?=?'1')?THEN--按下启动
?????????????????????state?<=?S1;
??????????????????ELSE
?????????????????????state?<=?S0;
??????????????????END?IF;
???????????????WHEN?S1?=>--计时状态
??????????????????IF?(key_2?=?'1')?THEN--按下停止
?????????????????????state?<=?S2;
??????????????????ELSE
?????????????????????state?<=?S1;
??????????????????END?IF;
???????????????WHEN?S2?=>--停止状态
??????????????????state?<=?S2;
???????????????WHEN?OTHERS?=>
????????????END?CASE;
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???PROCESS?(clk_in)
???BEGIN
??????IF?(clk_in'EVENT?AND?clk_in?=?'1')?THEN
????IF?(reset_p?=?'1')?THEN--复位
????????????num1?<=?"0000";
num2?<=?"0000";
num3?<=?"0000";
num4?<=?"0000";
num5?<=?"0000";
num6?<=?"0000";
?????????ELSIF?(state?=?S1)?THEN--计时状态
if(num6="0010"?and?num5="0100"?and?num4="0000"?and?num3="0000"?and?num2="0000"?and?num1="0000")then
num1?<=?num1;
num2?<=?num2;
num3?<=?num3;
num4?<=?num4;
num5?<=?num5;
num6?<=?num6;?
????????????elsif?num1="1001"?then?
num1<="0000";?--此IF语句完成个位十进制计数
if?num2="1001"?then?
num2<="0000";?--此IF语句完成十位十进制计数
if?num3="1001"?then?
num3<="0000";?--此IF语句完成百位十进制计数
if?num4="1001"?then?
num4<="0000";?--此IF语句完成千位十进制计数
if?num5="1001"?then?
num5<="0000";?--此IF语句完成万位十进制计数
if?num6="1001"?then?
num6<="0000";?--此IF语句完成十万位十进制计数
else
num6<=num6+"0001";
end?if;
else
num5<=num5+"0001";
end?if;
else?
num4<=num4+"0001";
end?if;
?else?
num3<=num3+"0001";
?end?if;
else?
num2<=num2+"0001";
end?if;
else?
num1<=num1+"0001";
end?if;
end?if;
end?if;
--end?if;
???END?PROCESS;
???
haomiao_cnt<=num3?&?num2?&?num1;--毫秒百十个位
miao_cnt<=num6?&?num5?&?num4;--秒百十个位
???--信号输出
???Millisecond?<=?haomiao_cnt;
???Second?<=?miao_cnt;
???current_state<=state;
???
END?RTL;

设计文档：

设计文档_2.doc

1. 工程文件