数字秒表VHDL启动暂停清零_电路方案

名称：数字秒表VHDL启动暂停清零（代码在文末付费下载）

软件：Quartus

语言：VHDL

代码功能：

数字秒表

使用VHDL语言设置数字秒表。要求具有百分秒、秒和分钟显示,百分秒范围00-99,秒范围00-59,分钟范围00-59。

系统具有启动/暂停功能系统具有清零功能。

本资源包含2个不同的代码工程，每个工程都可独立实现上述功能。具体可以下载下文中的设计文档阅读。

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?miaobaio_ctrl?IS
???PORT?(
??????clk_50M????????????????:?IN?STD_LOGIC;
??????clk_100Hz??????????????:?IN?STD_LOGIC;--100Hz--对应10ms
??????start??????????????:?IN?STD_LOGIC;--启动
??????stop???????????????:?IN?STD_LOGIC;--暂停
??????reset??????????????:?IN?STD_LOGIC;--复位
??????Millisecond??:?OUT?STD_LOGIC_VECTOR(7?DOWNTO?0);--百分秒
??????second???????:?OUT?STD_LOGIC_VECTOR(7?DOWNTO?0);--秒
??????minute???????:?OUT?STD_LOGIC_VECTOR(7?DOWNTO?0)--分
???);
END?miaobaio_ctrl;
ARCHITECTURE?trans?OF?miaobaio_ctrl?IS
???
???SIGNAL?state???????????:?STD_LOGIC_VECTOR(2?DOWNTO?0)?:=?"000";
???
???SIGNAL?Millisecond_cnt?:?STD_LOGIC_VECTOR(7?DOWNTO?0)?:=?"00000000";
???SIGNAL?second_cnt??????:?STD_LOGIC_VECTOR(7?DOWNTO?0)?:=?"00000000";
???SIGNAL?minute_cnt??????:?STD_LOGIC_VECTOR(7?DOWNTO?0)?:=?"00000000";
BEGIN
--计时状态机
???PROCESS?(clk_50M)
???BEGIN
??????IF?(clk_50M'EVENT?AND?clk_50M?=?'1')?THEN
?????????IF?((NOT(reset))?=?'1')?THEN
????????????state?<=?"011";--复位状态
?????????ELSE
????????????CASE?state?IS
???????????????WHEN?"011"?=>--复位状态
??????????????????state?<=?"000";
???????????????WHEN?"000"?=>--空闲状态
??????????????????IF?((NOT(start))?=?'1')?THEN
?????????????????????state?<=?"001";
??????????????????ELSE
?????????????????????state?<=?"000";
??????????????????END?IF;
???????????????WHEN?"001"?=>--计时状态
??????????????????IF?((NOT(stop))?=?'1')?THEN
?????????????????????state?<=?"010";
??????????????????ELSE
?????????????????????state?<=?"001";
??????????????????END?IF;
???????????????WHEN?"010"?=>--暂停状态
??????????????????IF?((NOT(start))?=?'1')?THEN
?????????????????????state?<=?"001";
??????????????????ELSE
?????????????????????state?<=?"010";
??????????????????END?IF;
???????????????WHEN?OTHERS?=>
????????????END?CASE;
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???
???PROCESS?(clk_50M)
???BEGIN
??????IF?(clk_50M'EVENT?AND?clk_50M?=?'1')?THEN
?????????IF?(state?=?"011")?THEN
????????????minute_cnt?<=?"00000000";
?????????ELSIF?(state?=?"001"?AND?clk_100Hz?=?'1')?THEN--计时状态
????????????IF?(Millisecond_cnt?=?"01100011"?AND?second_cnt?=?"00111011")?THEN--59秒99‘时向前记1分
???????????????IF?(minute_cnt?<?"00111011")?THEN
??????????????????minute_cnt?<=?minute_cnt?+?"00000001";--计时到990ms，下一次就到1秒了
???????????????ELSE
??????????????????minute_cnt?<=?"00000000";
???????????????END?IF;
????????????ELSE
???????????????minute_cnt?<=?minute_cnt;
????????????END?IF;
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???
???PROCESS?(clk_50M)
???BEGIN
??????IF?(clk_50M'EVENT?AND?clk_50M?=?'1')?THEN
?????????IF?(state?=?"011")?THEN--复位状态
????????????second_cnt?<=?"00000000";
?????????ELSIF?(state?=?"001"?AND?clk_100Hz?=?'1')?THEN--计时状态
????????????IF?(Millisecond_cnt?=?"01100011")?THEN--990ms时向前记1秒
???????????????IF?(second_cnt?<?"00111011")?THEN
??????????????????second_cnt?<=?second_cnt?+?"00000001";--计时到990ms，下一次就到1秒了
???????????????ELSE
??????????????????second_cnt?<=?"00000000";
???????????????END?IF;
????????????ELSE
???????????????second_cnt?<=?second_cnt;
????????????END?IF;
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???
???PROCESS?(clk_50M)
???BEGIN
??????IF?(clk_50M'EVENT?AND?clk_50M?=?'1')?THEN
?????????IF?(state?=?"011")?THEN--复位状态
????????????Millisecond_cnt?<=?"00000000";
?????????ELSIF?(state?=?"001"?AND?clk_100Hz?=?'1')?THEN--计时状态
????????????IF?(Millisecond_cnt?<?"01100011")?THEN--计时到990ms，下一次就到1秒了
???????????????Millisecond_cnt?<=?Millisecond_cnt?+?"00000001";
????????????ELSE
???????????????Millisecond_cnt?<=?"00000000";--计时到990ms，下一次就到1秒了
????????????END?IF;
?????????END?IF;
??????END?IF;
???END?PROCESS;
???
???
???Millisecond?<=?Millisecond_cnt;
???second?<=?second_cnt;
???minute?<=?minute_cnt;
???
END?trans;

设计文档：

设计文档2.doc

1. 工程文件