VHDL語言設(shè)計(jì)信號發(fā)生器試驗(yàn)報(bào)告VHDL語言設(shè)計(jì)信號發(fā)生器,波、鋸齒波的變換。VHDL設(shè)計(jì)多功能信號發(fā)生器一、設(shè)計(jì)任務(wù)VHDL(EDA6000試驗(yàn)箱)設(shè)計(jì)一個多功能信號發(fā)生器，要求:輯的特定波形(選作);100Hz~200KHz,且輸出頻率可以調(diào)整;具有顯示輸出波形、頻率的功能。(選作)二、系統(tǒng)頂層框圖弦波的數(shù)字幅度信息，每個查找表的地址對應(yīng)正(余)弦波幅度信號，同時輸出到數(shù)模轉(zhuǎn)換器(DAC)輸入端，DAC輸出的模擬信號經(jīng)過低通濾波器(LPF)，可以得到一個頻譜純潔的正(余)弦波。二、設(shè)計(jì)步驟用VHDL語言結(jié)合原理圖設(shè)計(jì)實(shí)現(xiàn)一個函數(shù)信號發(fā)生器,輸出正方波發(fā)生鄧各個模塊分別用VHDL語言編程為一個子程序,并把每一個模塊轉(zhuǎn)換成圖形文件,然后在原理圖編輯框調(diào)用這些圖形模塊,連接18f〔7...0〕,6、按鍵7、按鍵8掌握dlt、sin、sqr波形選通,最終把八位輸出接DAC0832D/A轉(zhuǎn)換,從示波器上就能看到波形輸出。按下不同的按鍵輸出不同的波形及頻率。三、系統(tǒng)設(shè)計(jì)(1)數(shù)控分頻器模塊DIN，來轉(zhuǎn)變輸出頻率。假設(shè)分頻系數(shù)為N，波形存儲模塊存儲一個周期的波形，試驗(yàn)里依據(jù)一個64foutfclk64.N(2).(存儲波形數(shù)據(jù))采樣點(diǎn)。080255;64個時鐘周期為一個三8.鋸齒波的存儲數(shù)據(jù)與三角波類似。0132個周期的延時來實(shí)現(xiàn)。正弦波:要通過波形變換實(shí)現(xiàn)把sina變換成(cosa1)*127.5的形式8位二進(jìn)制碼，存儲在波形存儲器里。(3)數(shù)據(jù)選擇器模塊3個按鍵來掌握波形選擇(4).LED(選作)LED顯示模塊主要是完成頻率掌握字的顯示，由于本次試驗(yàn)承受八位的由鍵盤輸入的頻率掌握字，累計(jì)尋址，讀取8256小，而恰好此時的頻率掌握字就是系統(tǒng)輸出波形的頻率，所以，LED8位二進(jìn)BCD碼。四、試驗(yàn)內(nèi)容設(shè)計(jì)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=>鋸齒波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<=