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名稱(chēng)：數(shù)字秒表VHDL精度毫秒可回看（代碼在文末付費(fèi)下載）

語(yǔ)言：VHDL

代碼功能：

數(shù)字秒表的VHDL設(shè)計(jì)，可以顯示秒和毫秒?？梢詥?dòng)、停止、復(fù)位。要求可以存儲(chǔ)6組時(shí)間，可以回看存儲(chǔ)的時(shí)間。

本資源內(nèi)含2個(gè)工程文件，兩個(gè)工程文件功能相同，均能實(shí)現(xiàn)上述數(shù)字秒表功能，但是代碼實(shí)現(xiàn)方式不同，詳見(jiàn)下述設(shè)計(jì)文檔_1和設(shè)計(jì)文檔_2.

本代碼已在實(shí)驗(yàn)箱驗(yàn)證，實(shí)驗(yàn)箱資料：

實(shí)驗(yàn)電路結(jié)構(gòu)圖及芯片引腳對(duì)應(yīng)表(1).doc

演示視頻：

FPGA代碼資源下載網(wǎng)：hdlcode.com

部分代碼展示

LIBRARY?ieee;
???USE?ieee.std_logic_1164.all;
???USE?ieee.std_logic_unsigned.all;
--秒表控制模塊
ENTITY?control?IS
???PORT?(
??????clk_in??????????:?IN?STD_LOGIC;--1KHz
??????reset_p???????????:?IN?STD_LOGIC;--復(fù)位
??????key_1???????????:?IN?STD_LOGIC;--啟動(dòng)
??????key_2???????????:?IN?STD_LOGIC;--停止
??current_state:?OUT?STD_LOGIC_VECTOR(1?DOWNTO?0);--當(dāng)前狀態(tài)
??????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";????--?創(chuàng)建信號(hào)???
???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
???--計(jì)時(shí)狀態(tài)機(jī)
???PROCESS?(clk_in)
???BEGIN
??????IF?(clk_in'EVENT?AND?clk_in?=?'1')?THEN
?????????IF?(reset_p?=?'1')?THEN--按下復(fù)位
????????????state?<=?S3;--復(fù)位狀態(tài)
?????????ELSE
????????????CASE?state?IS
???????????????WHEN?S3?=>--復(fù)位狀態(tài)
??????????????????state?<=?S0;
???????????????WHEN?S0?=>--空閑狀態(tài)
??????????????????IF?(key_1?=?'1')?THEN--按下啟動(dòng)
?????????????????????state?<=?S1;
??????????????????ELSE
?????????????????????state?<=?S0;
??????????????????END?IF;
???????????????WHEN?S1?=>--計(jì)時(shí)狀態(tài)
??????????????????IF?(key_2?=?'1')?THEN--按下停止
?????????????????????state?<=?S2;
??????????????????ELSE
?????????????????????state?<=?S1;
??????????????????END?IF;
???????????????WHEN?S2?=>--停止?fàn)顟B(tài)
??????????????????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--復(fù)位
????????????num1?<=?"0000";
num2?<=?"0000";
num3?<=?"0000";
num4?<=?"0000";
num5?<=?"0000";
num6?<=?"0000";
?????????ELSIF?(state?=?S1)?THEN--計(jì)時(shí)狀態(tài)
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語(yǔ)句完成個(gè)位十進(jìn)制計(jì)數(shù)
if?num2="1001"?then?
num2<="0000";?--此IF語(yǔ)句完成十位十進(jìn)制計(jì)數(shù)
if?num3="1001"?then?
num3<="0000";?--此IF語(yǔ)句完成百位十進(jìn)制計(jì)數(shù)
if?num4="1001"?then?
num4<="0000";?--此IF語(yǔ)句完成千位十進(jìn)制計(jì)數(shù)
if?num5="1001"?then?
num5<="0000";?--此IF語(yǔ)句完成萬(wàn)位十進(jìn)制計(jì)數(shù)
if?num6="1001"?then?
num6<="0000";?--此IF語(yǔ)句完成十萬(wàn)位十進(jìn)制計(jì)數(shù)
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;--毫秒百十個(gè)位
miao_cnt<=num6?&?num5?&?num4;--秒百十個(gè)位
???--信號(hào)輸出
???Millisecond?<=?haomiao_cnt;
???Second?<=?miao_cnt;
???current_state<=state;
???
END?RTL;

設(shè)計(jì)文檔：

設(shè)計(jì)文檔_2.doc

1. 工程文件