VHDL语言设计信号发生器实验报告

VHDL语言设计信号发生器试验报告VHDL语言设计信号发生器,波、锯齿波的变换。VHDL设计多功能信号发生器一、设计任务VHDL(EDA6000试验箱)设计一个多功能信号发生器，要求:辑的特定波形(选作);100Hz~200KHz,且输出频率可以调整;具有显示输出波形、频率的功能。(选作)二、系统顶层框图弦波的数字幅度信息，每个查找表的地址对应正(余)弦波幅度信号，同时输出到数模转换器(DAC)输入端，DAC输出的模拟信号经过低通滤波器(LPF)，可以得到一个频谱纯洁的正(余)弦波。二、设计步骤用VHDL语言结合原理图设计实现一个函数信号发生器,输出正方波发生邓各个模块分别用VHDL语言编程为一个子程序,并把每一个模块转换成图形文件,然后在原理图编辑框调用这些图形模块,连接18f〔7...0〕,6、按键7、按键8掌握dlt、sin、sqr波形选通,最终把八位输出接DAC0832D/A转换,从示波器上就能看到波形输出。按下不同的按键输出不同的波形及频率。三、系统设计(1)数控分频器模块DIN，来转变输出频率。假设分频系数为N，波形存储模块存储一个周期的波形，试验里依据一个64foutfclk64.N(2).(存储波形数据)采样点。080255;64个时钟周期为一个三8.锯齿波的存储数据与三角波类似。0132个周期的延时来实现。正弦波:要通过波形变换实现把sina变换成(cosa1)*127.5的形式8位二进制码，存储在波形存储器里。(3)数据选择器模块3个按键来掌握波形选择(4).LED(选作)LED显示模块主要是完成频率掌握字的显示，由于本次试验承受八位的由键盘输入的频率掌握字，累计寻址，读取8256小，而恰好此时的频率掌握字就是系统输出波形的频率，所以，LED8位二进BCD码。四、试验内容设计程序libraryieee;useieee.std_logic_1164.all;useieee.std_logic_unsigned.all;entityVhdl1isport(clk,sel:instd_logic;pout:outintegerrange255downto0);end;architecturedaccofVhdl1issignalq:integerrange63downto0;signalq1:integerrange2downto0;signald:integerrange255downto0;beginprocess(clk)beginifclk”eventandclk=”1”thenifq<63>elseqendif;endif;endprocess;process(sel)beginifsel”eventandsel=”1”thenifq1<3>elseq1<=0;endif;endif;endprocess;process(q,q1)begincaseq1iswhen0=>正弦波caseqiswhen00=>d<=255;>d<=254;>d<=252;>d<=249;>d<=245;>d<=239;>d<=233;>d<=225;>d<=217;>d<=207;>d<=197;>d<=186;>d<=174;>d<=162;>d<=150;>d<=137;>d<=124;>d<=112;>d<=99;>d<=87;>d<=75;>d<=64;>d<=53;>d<=43;>d<=34;>d<=26;>d<=19;>d<=13;>d<=8;>d<=4;>d<=1;>d<=0;when63=>d<=255;>d<=254;>d<=252;>d<=249;>d<=245;>d<=239;>d<=233;>d<=225;>d<=217;>d<=207;>d<=197;>d<=186;>d<=174;>d<=162;>d<=150;>d<=137;>d<=124;>d<=112;>d<=99;>d<=87;>d<=75;>d<=64;>d<=53;>d<=43;>d<=34;>d<=26;>d<=19;>d<=13;>d<=8;>d<=4;>d<=1;>d<=0;>null;endcase;when1=>方波caseqiswhen00=>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=225;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;>d<=255;when63=>d<=0;>d<=0;>d<=0;>d<=0;when59=>d<=0;>d<=0;>d<=0;>d<=0;when55=>d<=0;>d<=0;>d<=0;>d<=0;when51=>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>d<=0;>null;endcase;when2=>三角波caseqiswhen00=>d<=0;>d<=1;>d<=2;>d<=3;when04=>d<=4;>d<=5;>d<=6;>d<=7;when08=>d<=8;>d<=9;>d<=10;>d<=11;>d<=12;>d<=13;>d<=14;>d<=15;>d<=16;>d<=17;>d<=18;>d<=19;>d<=20;>d<=21;>d<=22;>d<=23;>d<=24;>d<=25;>d<=26;>d<=27;>d<=28;>d<=29;>d<=30;>d<=31;when62=>d<=0;>d<=1;>d<=2;when59=>d<=3;>d<=4;>d<=5;>d<=6;>d<=7;>d<=8;>d<=9;>d<=10;>d<=11;>d<=12;>d<=13;>d<=14;>d<=15;>d<=16;>d<=17;>d<=18;>d<=19;>d<=20;>d<=21;>d<=22;>d<=23;>d<=24;>d<=25;>d<=26;>d<=27;>d<=28;>d<=29;>d<=30;>null;endcase;when2=>锯齿波caseqiswhen00=>d<=0;>d<=3;>d<=6;>d<=9;>d<=12;>d<=15;>d<=18;>d<=21;>d<=24;>d<=27;>d<=30;>d<=33;>d<=36;>d<=39;>d<=42;>d<=45;>d<=44;>d<=43;>d<=42;>d<=41;>d<=40;>d<=39;>d<=38;>d<=37;>d<=36;>d<=35;>d<=34;>d<=33;>d<=32;>d<=31;>d<=30;>d<=29;when62=>d<=28;>d<=27;>d<=26;when59=>d<=25;>d<=24;>d<=23;>d<=22;>d<=21;>d<=20;>d<=19;>d<=18;>d<=17;>d<=16;>d<=15;>d<=14;>d<=13;>d<=12;>d<=11;>d<=