VHD语言设计方案循环灯控制器.docVIP

《VHDL与现代数字系统设计》试题 1、 设计一个循环灯控制器，该控制器控制红、绿、黄三个发光管循环发亮。要求红色发光管亮2秒，绿色发光管亮3秒，黄色发光管亮1秒。 1.1 端口定义：循环灯控制器的五个端口分别为Clr，Clk，Led_Red，Led_Bule，Led_Yellow，分别为清零信号、输入时钟信号、红灯控制信号、绿灯控制信号、黄灯控制信号，假设输入信号为1Hz 1.2 源程序 Library IEEE; Use IEEE.Std_Logic_1164.all; Entity LedControl is Port(Clr,Clk:IN Std_Logic; Led_Red,Led_Bule,Led_Yellow:OUT Std_Logic); End LedControl; Architecture Behavioral of LedControl is Type States is (S0,S1,S2,S3,S4,S5); Signal Temp:Std_Logic_Vector(2 downto 0); Signal State:States; Begin Process_First: Process(Clk,Clr) Begin If(Clr = 0) Then State = S0; Elsif(Clkevent and Clk = 1) Then Case State is When S0 = State = S1; When S1 = State = S2; When S2 = State = S3; When S3 = State = S4; When S4 = State = S5; When S5 = State = S0; End Case; End If; End Process Process_First; Process_Second: Process Begin If Clr = 0 Then Led_Red = 0; Led_Bule = 0; Led_Yellow = 0; Else Case State is When S0 = Led_Yellow = 1; Led_Red = 0; Led_Bule = 0; When S1 = Led_Yellow = 0; Led_Red = 1; Led_Bule = 0; When S2 = Led_Yellow = 0; Led_Red = 1; Led_Bule = 0; When S3 = Led_Yellow = 0; Led_Red = 0; Led_Bule = 1; When S4 = Led_Yellow = 0; Led_Red = 0; Led_Bule = 1; When S5 = Led_Yellow = 0; Led_Red = 0; Led_Bule = 1; End Case; End If; End Process Process_Second; End Behavioral; 1.3 仿真 2、 设计一个数码显示的秒表。其功能为： （1）具有显示30秒计时功能。 （2）开机显示30.00。 （3）具有复位，暂停、计时的功能。 （4）30秒递减。 （5）30秒递减至零时发出声光报警信号。 2.1 总体概述 秒表的总体框图如下： 端口定义：Clk――输入时钟 Start――启动暂停信号 Reset――复位信号 LED_Seg[7…0]――数码管字型码输出 LED_Select[3…0]――数码管选择位输出 2.2 源程序 2.2.1 分频器部分 Library IEEE; Use IEEE.Std_Logic_1164.all; Use IEEE.Std_Logic_unsigned.all; Entity FreDivider is P