用VHDL 设计一个100天的倒计时器

这个程序主要是分频器的用法吧！给你个程序，帆哪和希望是你想缓派要的LIBRARY IEEEUSE IEEE.STD_LOGIC_1164.ALLUSE IEEE.STD_LOGIC_UNSIGNED.ALLENTITY FFF ISPORT(CLK,RESET:IN STD_LOGIC ---系统时钟和复位信号 LOAD:IN STD_LOGIC ---实现将你要预置的数输入给计数器 CURRENT:IN INTEGER RANGE 0 TO 10000--你要预置的数 COUNT:OUT INTEGER RANGE 0 TO 10000--计数器计数值 FENMIN:OUT STD_LOGIC) ---蜂鸣器值ENDARCHITECTURE ART OF FFF ISSIGNAL COUNT_1,COUNT_2,COUNT_D:INTEGER RANGE 0 TO 10000SIGNAL CLK_1,CLK_2:STD_LOGICBEGINPROCESS(CLK,RESET)----编写1hz时钟BEGIN IF RESET='1' THEN COUNT_1<=0 ELSIF CLK'EVENT AND CLK='1' THEN IF COUNT_1=500 THENCOUNT_1<=0 CLK_1<=NOT CLK_1ELSE COUNT_1<=COUNT_1+1END IFEND IFEND PROCESSPROCESS(CLK,RESET)---编写50hz的时钟BEGIN IF RESET='1' THEN COUNT_2<=0ELSIF CLK'EVENT AND CLK='1' THEN IF COUNT_2=100 THENCOUNT_2<=0CLK_2<=NOT CLK_2 ELSE COUNT_2<=COUNT_2+1END IFEND IFEND PROCESSPROCESS(CLK_1,CLK_2,LOAD,CURRENT,RESET)---实现计数器自减BEGIN IF RESET='1' THEN COUNT_D<=0ELSIF LOAD='1' THENCOUNT_D<=CURRENTELSIF CLK_1'EVENT AND CLK_1='1' THEN IF COUNT_D=0 THEN COUNT_D<=0 ELSE COUNT_D<=COUNT_D-1 END IFEND IFCOUNT<=COUNT_DEND PROCESSPROCESS(COUNT_D) ---当计数值为0时，蜂鸣器响态盯BEGIN IF COUNT_D=0 THEN FENMIN<=CLK_2ELSE FENMIN<='0'END IFEND PROCESSEND ART

这个程序主要是分频器的用法吧！给你个程序，希望是你想要的

LIBRARY IEEE

USE IEEE.STD_LOGIC_1164.ALL

USE IEEE.STD_LOGIC_UNSIGNED.ALL

ENTITY FFF IS

PORT(CLK,RESET:IN STD_LOGIC ---系统时钟和复位信号

LOAD:IN STD_LOGIC ---实现将你要预置的数输入给察拦差计数器

CURRENT:IN INTEGER RANGE 0 TO 10000--你要预置的数

COUNT:OUT INTEGER RANGE 0 TO 10000--计数器计数值

FENMIN:OUT STD_LOGIC) ---蜂鸣器值

END

ARCHITECTURE ART OF FFF IS

SIGNAL COUNT_1,COUNT_2,COUNT_D:INTEGER RANGE 0 TO 10000

SIGNAL CLK_1,CLK_2:STD_LOGIC

BEGIN

PROCESS(CLK,RESET)----编写1hz时钟

BEGIN

IF RESET='1' THEN

COUNT_1<=0

ELSIF CLK'EVENT AND CLK='1' THEN

IF COUNT_1=500 THEN

COUNT_1<=0

CLK_1<=NOT CLK_1

ELSE COUNT_1<=COUNT_1+1

END IF

END IF

END PROCESS

PROCESS(CLK,RESET)---编写50hz的时钟

BEGIN

IF RESET='1' THEN

COUNT_2<=0

ELSIF CLK'EVENT AND CLK='1'败皮 THEN

IF COUNT_2=100 THEN

COUNT_2<=0CLK_2<=NOT CLK_2

ELSE COUNT_2<=COUNT_2+1

END IF

END IF

END PROCESS

PROCESS(CLK_1,CLK_2,LOAD,CURRENT,RESET)---实现计数衡渗器自减

BEGIN

IF RESET='1' THEN

COUNT_D<=0

ELSIF LOAD='1' THEN

COUNT_D<=CURRENT

ELSIF CLK_1'EVENT AND CLK_1='1' THEN

IF COUNT_D=0 THEN

COUNT_D<=0

ELSE COUNT_D<=COUNT_D-1

END IF

END IF

COUNT<=COUNT_D

END PROCESS

PROCESS(COUNT_D) ---当计数值为0时，蜂鸣器响

BEGIN

IF COUNT_D=0 THEN

FENMIN<=CLK_2

ELSE FENMIN<='0'

END IF

END PROCESS

END ART

启动倒计时信号未来，灯全亮

做一个1秒计数器

做一个计数到64的计数器

启动信号到来，1秒计数器喊者工作

1秒计数器到，1秒计数器再启动；同时，64的计数器减一

用64的计数器的值作为灯此渗余号，作一个译码器，对应一个灯，把关灯信号森滚加到这个灯上。如果1bit对应1个灯，把计数器值作为地址，改变相应bit内容。

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