01 DDS
一、工作原理
DDS(Direct Digital Synthesis)直接数字合成,常当成是信号发生器。通过matlab生成 2n 个点的正弦波查找表,波形数据保存在txt文本中。
二、matlab产生波形数据
这里是生成1024点正弦波数据,那么在区间(0,2π)内,每隔 2π/(1024-1)取一个值。
clear all close all clc N = 1024;%1024点一个正弦周期 Q = 32; %量化32bit t =0:2*pi/(N-1):2*pi; sin_dds = sin(t); Maxb = max(abs(sin_dds)); Qb=round((sin_dds/Maxb)*(2^(Q-1)-1)); fidQb= fopen('wave.txt','w'); fprintf(fidQb,'wire signed [31:0] dds_rom[0:%d];\n',N-1); for i=1:length(Qb) fprintf(fidQb,'assign dds_rom[%d]=%d;\n',i-1,Qb(i)); end fclose(fidQb); figure, hold on plot(t,sin_dds,'*'); legend('sin'); grid; hold off figure, hold on plot(t,Qb,'*'); legend('sin'); grid; hold off
还有一个正弦波波形的数据:
三、综合代码
module dds_rom( input sys_clk, input [9:0]sin_addr,//地址数就是有多少个点,这里是1024 output signed[31:0]sin,//正弦波波形数据格式是32位 output signed[31:0]cos ); wire signed[31:0]rom[0:1023]; wire [9:0]cos_addr; assign cos_addr=sin_addr+10'd256; assign sin=rom[sin_addr]; assign cos=rom[cos_addr]; assign rom[0]=0; assign rom[1]=13189608; assign rom[2]=26378718; assign rom[3]=39566833; assign rom[4]=52753456; assign rom[5]=65938088; assign rom[6]=79120233; assign rom[7]=92299394; assign rom[8]=105475073; assign rom[9]=118646772; assign rom[10]=131813997; assign rom[11]=144976248; assign rom[12]=158133031; assign rom[13]=171283849; assign rom[14]=184428205; assign rom[15]=197565604; assign rom[16]=210695550; assign rom[17]=223817548; assign rom[18]=236931103; assign rom[19]=250035720; assign rom[20]=263130905; assign rom[21]=276216164; assign rom[22]=289291003; assign rom[23]=302354930; assign rom[24]=315407450; assign rom[25]=328448072; assign rom[26]=341476305; assign rom[27]=354491656; assign rom[28]=367493634; assign rom[29]=380481749; assign rom[30]=393455512; assign rom[31]=406414432; assign rom[32]=419358020; assign rom[33]=432285790; assign rom[34]=445197252; assign rom[35]=458091920; assign rom[36]=470969307; assign rom[37]=483828928; assign rom[38]=496670297; assign rom[39]=509492931; assign rom[40]=522296345; assign rom[41]=535080056; assign rom[42]=547843582; assign rom[43]=560586442; assign rom[44]=573308155; assign rom[45]=586008241; assign rom[46]=598686221; assign rom[47]=611341617; assign rom[48]=623973951; assign rom[49]=636582747; assign rom[50]=649167528; assign rom[51]=661727822; assign rom[52]=674263153; assign rom[53]=686773048; assign rom[54]=699257037; assign rom[55]=711714647; assign rom[56]=724145409; assign rom[57]=736548855; assign rom[58]=748924515; assign rom[59]=761271924; assign rom[60]=773590615; assign rom[61]=785880124; assign rom[62]=798139987; assign rom[63]=810369741; assign rom[64]=822568927; assign rom[65]=834737082; assign rom[66]=846873748; assign rom[67]=858978468; assign rom[68]=871050785; assign rom[69]=883090242; assign rom[70]=895096387; assign rom[71]=907068766; assign rom[72]=919006928; assign rom[73]=930910422; assign rom[74]=942778799; assign rom[75]=954611611; assign rom[76]=966408413; assign rom[77]=978168759; assign rom[78]=989892205; assign rom[79]=1001578310; assign rom[80]=1013226631; assign rom[81]=1024836731; assign rom[82]=1036408171; assign rom[83]=1047940514; assign rom[84]=1059433326; assign rom[85]=1070886173; assign rom[86]=1082298622; assign rom[87]=1093670244; assign rom[88]=1105000610; assign rom[89]=1116289291; assign rom[90]=1127535862; assign rom[91]=1138739900; assign rom[92]=1149900980; assign rom[93]=1161018683; assign rom[94]=1172092589; assign rom[95]=1183122279; assign rom[96]=1194107339; assign rom[97]=1205047353; assign rom[98]=1215941909; assign rom[99]=1226790596; assign rom[100]=1237593005; assign rom[101]=1248348728; assign rom[102]=1259057359; assign rom[103]=1269718495; assign rom[104]=1280331733; assign rom[105]=1290896673; assign rom[106]=1301412917; assign rom[107]=1311880067; assign rom[108]=1322297729; assign rom[109]=1332665510; assign rom[110]=1342983019; assign rom[111]=1353249866; assign rom[112]=1363465664; assign rom[113]=1373630029; assign rom[114]=1383742575; assign rom[115]=1393802923; assign rom[116]=1403810692; assign rom[117]=1413765506; assign rom[118]=1423666987; assign rom[119]=1433514764; assign rom[120]=1443308464; assign rom[121]=1453047717; assign rom[122]=1462732158; assign rom[123]=1472361420; assign rom[124]=1481935139; assign rom[125]=1491452956; assign rom[126]=1500914510; assign rom[127]=1510319445; assign rom[128]=1519667407; assign rom[129]=1528958041; assign rom[130]=1538190999; assign rom[131]=1547365932; assign rom[132]=1556482493; assign rom[133]=1565540339; assign rom[134]=1574539127; assign rom[135]=1583478520; assign rom[136]=1592358178; assign rom[137]=1601177768; assign rom[138]=1609936957; assign rom[139]=1618635414; assign rom[140]=1627272811; assign rom[141]=1635848822; assign rom[142]=1644363124; assign rom[143]=1652815396; assign rom[144]=1661205318; assign rom[145]=1669532574; assign rom[146]=1677796851; assign rom[147]=1685997836; assign rom[148]=1694135220; assign rom[149]=1702208696; assign rom[150]=1710217959; assign rom[151]=1718162708; assign rom[152]=1726042642; assign rom[153]=1733857465; assign rom[154]=1741606881; assign rom[155]=1749290598; assign rom[156]=1756908327; assign rom[157]=1764459780; assign rom[158]=1771944672; assign rom[159]=1779362721; assign rom[160]=1786713647; assign rom[161]=1793997172; assign rom[162]=1801213022; assign rom[163]=1808360925; assign rom[164]=1815440611; assign rom[165]=1822451813; assign rom[166]=1829394267; assign rom[167]=1836267710; assign rom[168]=1843071884; assign rom[169]=1849806531; assign rom[170]=1856471398; assign rom[171]=1863066233; assign rom[172]=1869590787; assign rom[173]=1876044815; assign rom[174]=1882428072; assign rom[175]=1888740319; assign rom[176]=1894981316; assign rom[177]=1901150829; assign rom[178]=1907248625; assign rom[179]=1913274473; assign rom[180]=1919228147; assign rom[181]=1925109422; assign rom[182]=1930918075; assign rom[183]=1936653889; assign rom[184]=1942316645; assign rom[185]=1947906132; assign rom[186]=1953422138; assign rom[187]=1958864454; assign rom[188]=1964232876; assign rom[189]=1969527202; assign rom[190]=1974747230; assign rom[191]=1979892765; assign rom[192]=1984963613; assign rom[193]=1989959581; assign rom[194]=1994880482; assign rom[195]=1999726130; assign rom[196]=2004496343; assign rom[197]=2009190939; assign rom[198]=2013809743; assign rom[199]=2018352579; assign rom[200]=2022819277; assign rom[201]=2027209668; assign rom[202]=2031523587; assign rom[203]=2035760870; assign rom[204]=2039921358; assign rom[205]=2044004894; assign rom[206]=2048011324; assign rom[207]=2051940496; assign rom[208]=2055792263; assign rom[209]=2059566479; assign rom[210]=2063263002; assign rom[211]=2066881693; assign rom[212]=2070422414; assign rom[213]=2073885032; assign rom[214]=2077269417; assign rom[215]=2080575442; assign rom[216]=2083802980; assign rom[217]=2086951911; assign rom[218]=2090022116; assign rom[219]=2093013479; assign rom[220]=2095925886; assign rom[221]=2098759229; assign rom[222]=2101513401; assign rom[223]=2104188297; assign rom[224]=2106783816; assign rom[225]=2109299861; assign rom[226]=2111736337; assign rom[227]=2114093151; assign rom[228]=2116370216; assign rom[229]=2118567444; assign rom[230]=2120684754; assign rom[231]=2122722064; assign rom[232]=2124679300; assign rom[233]=2126556385; assign rom[234]=2128353251; assign rom[235]=2130069828; assign rom[236]=2131706053; assign rom[237]=2133261863; assign rom[238]=2134737200; assign rom[239]=2136132008; assign rom[240]=2137446235; assign rom[241]=2138679831; assign rom[242]=2139832749; assign rom[243]=2140904945; assign rom[244]=2141896381; assign rom[245]=2142807017; assign rom[246]=2143636821; assign rom[247]=2144385759; assign rom[248]=2145053805; assign rom[249]=2145640933; assign rom[250]=2146147121; assign rom[251]=2146572349; assign rom[252]=2146916602; assign rom[253]=2147179867; assign rom[254]=2147362133; assign rom[255]=2147463395; assign rom[256]=2147483647; assign rom[257]=2147422890; assign rom[258]=2147281125; assign rom[259]=2147058358; assign rom[260]=2146754598; assign rom[261]=2146369856; assign rom[262]=2145904146; assign rom[263]=2145357485; assign rom[264]=2144729895; assign rom[265]=2144021400; assign rom[266]=2143232025; assign rom[267]=2142361801; assign rom[268]=2141410761; assign rom[269]=2140378940; assign rom[270]=2139266377; assign rom[271]=2138073115; assign rom[272]=2136799197; assign rom[273]=2135444674; assign rom[274]=2134009594; assign rom[275]=2132494014; assign rom[276]=2130897989; assign rom[277]=2129221580; assign rom[278]=2127464850; assign rom[279]=2125627866; assign rom[280]=2123710696; assign rom[281]=2121713414; assign rom[282]=2119636094; assign rom[283]=2117478815; assign rom[284]=2115241658; assign rom[285]=2112924707; assign rom[286]=2110528051; assign rom[287]=2108051779; assign rom[288]=2105495985; assign rom[289]=2102860765; assign rom[290]=2100146218; assign rom[291]=2097352448; assign rom[292]=2094479559; assign rom[293]=2091527660; assign rom[294]=2088496862; assign rom[295]=2085387279; assign rom[296]=2082199029; assign rom[297]=2078932233; assign rom[298]=2075587012; assign rom[299]=2072163494; assign rom[300]=2068661808; assign rom[301]=2065082085; assign rom[302]=2061424461; assign rom[303]=2057689074; assign rom[304]=2053876065; assign rom[305]=2049985576; assign rom[306]=2046017757; assign rom[307]=2041972755; assign rom[308]=2037850723; assign rom[309]=2033651818; assign rom[310]=2029376197; assign rom[311]=2025024022; assign rom[312]=2020595456; assign rom[313]=2016090668; assign rom[314]=2011509826; assign rom[315]=2006853104; assign rom[316]=2002120677; assign rom[317]=1997312724; assign rom[318]=1992429427; assign rom[319]=1987470969; assign rom[320]=1982437537; assign rom[321]=1977329322; assign rom[322]=1972146515; assign rom[323]=1966889314; assign rom[324]=1961557915; assign rom[325]=1956152520; assign rom[326]=1950673333; assign rom[327]=1945120561; assign rom[328]=1939494412; assign rom[329]=1933795100; assign rom[330]=1928022840; assign rom[331]=1922177848; assign rom[332]=1916260346; assign rom[333]=1910270557; assign rom[334]=1904208706; assign rom[335]=1898075023; assign rom[336]=1891869739; assign rom[337]=1885593087; assign rom[338]=1879245305; assign rom[339]=1872826632; assign rom[340]=1866337311; assign rom[341]=1859777585; assign rom[342]=1853147703; assign rom[343]=1846447914; assign rom[344]=1839678472; assign rom[345]=1832839631; assign rom[346]=1825931650; assign rom[347]=1818954790; assign rom[348]=1811909312; assign rom[349]=1804795484; assign rom[350]=1797613574; assign rom[351]=1790363852; assign rom[352]=1783046591; assign rom[353]=1775662069; assign rom[354]=1768210564; assign rom[355]=1760692356; assign rom[356]=1753107729; assign rom[357]=1745456970; assign rom[358]=1737740367; assign rom[359]=1729958211; assign rom[360]=1722110795; assign rom[361]=1714198417; assign rom[362]=1706221373; assign rom[363]=1698179965; assign rom[364]=1690074497; assign rom[365]=1681905274; assign rom[366]=1673672605; assign rom[367]=1665376799; assign rom[368]=1657018170; assign rom[369]=1648597034; assign rom[370]=1640113707; assign rom[371]=1631568510; assign rom[372]=1622961765; assign rom[373]=1614293798; assign rom[374]=1605564934; assign rom[375]=1596775503; assign rom[376]=1587925837; assign rom[377]=1579016269; assign rom[378]=1570047136; assign rom[379]=1561018777; assign rom[380]=1551931530; assign rom[381]=1542785740; assign rom[382]=1533581752; assign rom[383]=1524319912; assign rom[384]=1515000570; assign rom[385]=1505624077; assign rom[386]=1496190788; assign rom[387]=1486701058; assign rom[388]=1477155245; assign rom[389]=1467553709; assign rom[390]=1457896812; assign rom[391]=1448184919; assign rom[392]=1438418396; assign rom[393]=1428597612; assign rom[394]=1418722936; assign rom[395]=1408794742; assign rom[396]=1398813404; assign rom[397]=1388779298; assign rom[398]=1378692803; assign rom[399]=1368554300; assign rom[400]=1358364170; assign rom[401]=1348122799; assign rom[402]=1337830573; assign rom[403]=1327487879; assign rom[404]=1317095109; assign rom[405]=1306652653; assign rom[406]=1296160907; assign rom[407]=1285620265; assign rom[408]=1275031126; assign rom[409]=1264393889; assign rom[410]=1253708955; assign rom[411]=1242976727; assign rom[412]=1232197611; assign rom[413]=1221372012; assign rom[414]=1210500339; assign rom[415]=1199583002; assign rom[416]=1188620414; assign rom[417]=1177612987; assign rom[418]=1166561137; assign rom[419]=1155465280; assign rom[420]=1144325836; assign rom[421]=1133143224; assign rom[422]=1121917867; assign rom[423]=1110650187; assign rom[424]=1099340611; assign rom[425]=1087989564; assign rom[426]=1076597474; assign rom[427]=1065164772; assign rom[428]=1053691889; assign rom[429]=1042179257; assign rom[430]=1030627311; assign rom[431]=1019036486; assign rom[432]=1007407221; assign rom[433]=995739953; assign rom[434]=984035122; assign rom[435]=972293171; assign rom[436]=960514541; assign rom[437]=948699679; assign rom[438]=936849028; assign rom[439]=924963036; assign rom[440]=913042152; assign rom[441]=901086826; assign rom[442]=889097507; assign rom[443]=877074649; assign rom[444]=865018705; assign rom[445]=852930130; assign rom[446]=840809380; assign rom[447]=828656912; assign rom[448]=816473184; assign rom[449]=804258656; assign rom[450]=792013790; assign rom[451]=779739046; assign rom[452]=767434888; assign rom[453]=755101780; assign rom[454]=742740187; assign rom[455]=730350576; assign rom[456]=717933414; assign rom[457]=705489169; assign rom[458]=693018310; assign rom[459]=680521309; assign rom[460]=667998637; assign rom[461]=655450766; assign rom[462]=642878169; assign rom[463]=630281321; assign rom[464]=617660696; assign rom[465]=605016772; assign rom[466]=592350024; assign rom[467]=579660932; assign rom[468]=566949972; assign rom[469]=554217626; assign rom[470]=541464372; assign rom[471]=528690693; assign rom[472]=515897070; assign rom[473]=503083986; assign rom[474]=490251924; assign rom[475]=477401369; assign rom[476]=464532804; assign rom[477]=451646715; assign rom[478]=438743590; assign rom[479]=425823913; assign rom[480]=412888173; assign rom[481]=399936857; assign rom[482]=386970455; assign rom[483]=373989455; assign rom[484]=360994347; assign rom[485]=347985621; assign rom[486]=334963768; assign rom[487]=321929279; assign rom[488]=308882646; assign rom[489]=295824361; assign rom[490]=282754917; assign rom[491]=269674806; assign rom[492]=256584522; assign rom[493]=243484559; assign rom[494]=230375412; assign rom[495]=217257573; assign rom[496]=204131539; assign rom[497]=190997805; assign rom[498]=177856865; assign rom[499]=164709216; assign rom[500]=151555354; assign rom[501]=138395775; assign rom[502]=125230975; assign rom[503]=112061451; assign rom[504]=98887700; assign rom[505]=85710218; assign rom[506]=72529503; assign rom[507]=59346052; assign rom[508]=46160362; assign rom[509]=32972931; assign rom[510]=19784256; assign rom[511]=6594835; assign rom[512]=-6594835; assign rom[513]=-19784256; assign rom[514]=-32972931; assign rom[515]=-46160362; assign rom[516]=-59346052; assign rom[517]=-72529503; assign rom[518]=-85710218; assign rom[519]=-98887700; assign rom[520]=-112061451; assign rom[521]=-125230975; assign rom[522]=-138395775; assign rom[523]=-151555354; assign rom[524]=-164709216; assign rom[525]=-177856865; assign rom[526]=-190997805; assign rom[527]=-204131539; assign rom[528]=-217257573; assign rom[529]=-230375412; assign rom[530]=-243484559; assign rom[531]=-256584522; assign rom[532]=-269674806; assign rom[533]=-282754917; assign rom[534]=-295824361; assign rom[535]=-308882646; assign rom[536]=-321929279; assign rom[537]=-334963768; assign rom[538]=-347985621; assign rom[539]=-360994347; assign rom[540]=-373989455; assign rom[541]=-386970455; assign rom[542]=-399936857; assign rom[543]=-412888173; assign rom[544]=-425823913; assign rom[545]=-438743590; assign rom[546]=-451646715; assign rom[547]=-464532804; assign rom[548]=-477401369; assign rom[549]=-490251924; assign rom[550]=-503083986; assign rom[551]=-515897070; assign rom[552]=-528690693; assign rom[553]=-541464372; assign rom[554]=-554217626; assign rom[555]=-566949972; assign rom[556]=-579660932; assign rom[557]=-592350024; assign rom[558]=-605016772; assign rom[559]=-617660696; assign rom[560]=-630281321; assign rom[561]=-642878169; assign rom[562]=-655450766; assign rom[563]=-667998637; assign rom[564]=-680521309; assign rom[565]=-693018310; assign rom[566]=-705489169; assign rom[567]=-717933414; assign rom[568]=-730350576; assign rom[569]=-742740187; assign rom[570]=-755101780; assign rom[571]=-767434888; assign rom[572]=-779739046; assign rom[573]=-792013790; assign rom[574]=-804258656; assign rom[575]=-816473184; assign rom[576]=-828656912; assign rom[577]=-840809380; assign rom[578]=-852930130; assign rom[579]=-865018705; assign rom[580]=-877074649; assign rom[581]=-889097507; assign rom[582]=-901086826; assign rom[583]=-913042152; assign rom[584]=-924963036; assign rom[585]=-936849028; assign rom[586]=-948699679; assign rom[587]=-960514541; assign rom[588]=-972293171; assign rom[589]=-984035122; assign rom[590]=-995739953; assign rom[591]=-1007407221; assign rom[592]=-1019036486; assign rom[593]=-1030627311; assign rom[594]=-1042179257; assign rom[595]=-1053691889; assign rom[596]=-1065164772; assign rom[597]=-1076597474; assign rom[598]=-1087989564; assign rom[599]=-1099340611; assign rom[600]=-1110650187; assign rom[601]=-1121917867; assign rom[602]=-1133143224; assign rom[603]=-1144325836; assign rom[604]=-1155465280; assign rom[605]=-1166561137; assign rom[606]=-1177612987; assign rom[607]=-1188620414; assign rom[608]=-1199583002; assign rom[609]=-1210500339; assign rom[610]=-1221372012; assign rom[611]=-1232197611; assign rom[612]=-1242976727; assign rom[613]=-1253708955; assign rom[614]=-1264393889; assign rom[615]=-1275031126; assign rom[616]=-1285620265; assign rom[617]=-1296160907; assign rom[618]=-1306652653; assign rom[619]=-1317095109; assign rom[620]=-1327487879; assign rom[621]=-1337830573; assign rom[622]=-1348122799; assign rom[623]=-1358364170; assign rom[624]=-1368554300; assign rom[625]=-1378692803; assign rom[626]=-1388779298; assign rom[627]=-1398813404; assign rom[628]=-1408794742; assign rom[629]=-1418722936; assign rom[630]=-1428597612; assign rom[631]=-1438418396; assign rom[632]=-1448184919; assign rom[633]=-1457896812; assign rom[634]=-1467553709; assign rom[635]=-1477155245; assign rom[636]=-1486701058; assign rom[637]=-1496190788; assign rom[638]=-1505624077; assign rom[639]=-1515000570; assign rom[640]=-1524319912; assign rom[641]=-1533581752; assign rom[642]=-1542785740; assign rom[643]=-1551931530; assign rom[644]=-1561018777; assign rom[645]=-1570047136; assign rom[646]=-1579016269; assign rom[647]=-1587925837; assign rom[648]=-1596775503; assign rom[649]=-1605564934; assign rom[650]=-1614293798; assign rom[651]=-1622961765; assign rom[652]=-1631568510; assign rom[653]=-1640113707; assign rom[654]=-1648597034; assign rom[655]=-1657018170; assign rom[656]=-1665376799; assign rom[657]=-1673672605; assign rom[658]=-1681905274; assign rom[659]=-1690074497; assign rom[660]=-1698179965; assign rom[661]=-1706221373; assign rom[662]=-1714198417; assign rom[663]=-1722110795; assign rom[664]=-1729958211; assign rom[665]=-1737740367; assign rom[666]=-1745456970; assign rom[667]=-1753107729; assign rom[668]=-1760692356; assign rom[669]=-1768210564; assign rom[670]=-1775662069; assign rom[671]=-1783046591; assign rom[672]=-1790363852; assign rom[673]=-1797613574; assign rom[674]=-1804795484; assign rom[675]=-1811909312; assign rom[676]=-1818954790; assign rom[677]=-1825931650; assign rom[678]=-1832839631; assign rom[679]=-1839678472; assign rom[680]=-1846447914; assign rom[681]=-1853147703; assign rom[682]=-1859777585; assign rom[683]=-1866337311; assign rom[684]=-1872826632; assign rom[685]=-1879245305; assign rom[686]=-1885593087; assign rom[687]=-1891869739; assign rom[688]=-1898075023; assign rom[689]=-1904208706; assign rom[690]=-1910270557; assign rom[691]=-1916260346; assign rom[692]=-1922177848; assign rom[693]=-1928022840; assign rom[694]=-1933795100; assign rom[695]=-1939494412; assign rom[696]=-1945120561; assign rom[697]=-1950673333; assign rom[698]=-1956152520; assign rom[699]=-1961557915; assign rom[700]=-1966889314; assign rom[701]=-1972146515; assign rom[702]=-1977329322; assign rom[703]=-1982437537; assign rom[704]=-1987470969; assign rom[705]=-1992429427; assign rom[706]=-1997312724; assign rom[707]=-2002120677; assign rom[708]=-2006853104; assign rom[709]=-2011509826; assign rom[710]=-2016090668; assign rom[711]=-2020595456; assign rom[712]=-2025024022; assign rom[713]=-2029376197; assign rom[714]=-2033651818; assign rom[715]=-2037850723; assign rom[716]=-2041972755; assign rom[717]=-2046017757; assign rom[718]=-2049985576; assign rom[719]=-2053876065; assign rom[720]=-2057689074; assign rom[721]=-2061424461; assign rom[722]=-2065082085; assign rom[723]=-2068661808; assign rom[724]=-2072163494; assign rom[725]=-2075587012; assign rom[726]=-2078932233; assign rom[727]=-2082199029; assign rom[728]=-2085387279; assign rom[729]=-2088496862; assign rom[730]=-2091527660; assign rom[731]=-2094479559; assign rom[732]=-2097352448; assign rom[733]=-2100146218; assign rom[734]=-2102860765; assign rom[735]=-2105495985; assign rom[736]=-2108051779; assign rom[737]=-2110528051; assign rom[738]=-2112924707; assign rom[739]=-2115241658; assign rom[740]=-2117478815; assign rom[741]=-2119636094; assign rom[742]=-2121713414; assign rom[743]=-2123710696; assign rom[744]=-2125627866; assign rom[745]=-2127464850; assign rom[746]=-2129221580; assign rom[747]=-2130897989; assign rom[748]=-2132494014; assign rom[749]=-2134009594; assign rom[750]=-2135444674; assign rom[751]=-2136799197; assign rom[752]=-2138073115; assign rom[753]=-2139266377; assign rom[754]=-2140378940; assign rom[755]=-2141410761; assign rom[756]=-2142361801; assign rom[757]=-2143232025; assign rom[758]=-2144021400; assign rom[759]=-2144729895; assign rom[760]=-2145357485; assign rom[761]=-2145904146; assign rom[762]=-2146369856; assign rom[763]=-2146754598; assign rom[764]=-2147058358; assign rom[765]=-2147281125; assign rom[766]=-2147422890; assign rom[767]=-2147483647; assign rom[768]=-2147463395; assign rom[769]=-2147362133; assign rom[770]=-2147179867; assign rom[771]=-2146916602; assign rom[772]=-2146572349; assign rom[773]=-2146147121; assign rom[774]=-2145640933; assign rom[775]=-2145053805; assign rom[776]=-2144385759; assign rom[777]=-2143636821; assign rom[778]=-2142807017; assign rom[779]=-2141896381; assign rom[780]=-2140904945; assign rom[781]=-2139832749; assign rom[782]=-2138679831; assign rom[783]=-2137446235; assign rom[784]=-2136132008; assign rom[785]=-2134737200; assign rom[786]=-2133261863; assign rom[787]=-2131706053; assign rom[788]=-2130069828; assign rom[789]=-2128353251; assign rom[790]=-2126556385; assign rom[791]=-2124679300; assign rom[792]=-2122722064; assign rom[793]=-2120684754; assign rom[794]=-2118567444; assign rom[795]=-2116370216; assign rom[796]=-2114093151; assign rom[797]=-2111736337; assign rom[798]=-2109299861; assign rom[799]=-2106783816; assign rom[800]=-2104188297; assign rom[801]=-2101513401; assign rom[802]=-2098759229; assign rom[803]=-2095925886; assign rom[804]=-2093013479; assign rom[805]=-2090022116; assign rom[806]=-2086951911; assign rom[807]=-2083802980; assign rom[808]=-2080575442; assign rom[809]=-2077269417; assign rom[810]=-2073885032; assign rom[811]=-2070422414; assign rom[812]=-2066881693; assign rom[813]=-2063263002; assign rom[814]=-2059566479; assign rom[815]=-2055792263; assign rom[816]=-2051940496; assign rom[817]=-2048011324; assign rom[818]=-2044004894; assign rom[819]=-2039921358; assign rom[820]=-2035760870; assign rom[821]=-2031523587; assign rom[822]=-2027209668; assign rom[823]=-2022819277; assign rom[824]=-2018352579; assign rom[825]=-2013809743; assign rom[826]=-2009190939; assign rom[827]=-2004496343; assign rom[828]=-1999726130; assign rom[829]=-1994880482; assign rom[830]=-1989959581; assign rom[831]=-1984963613; assign rom[832]=-1979892765; assign rom[833]=-1974747230; assign rom[834]=-1969527202; assign rom[835]=-1964232876; assign rom[836]=-1958864454; assign rom[837]=-1953422138; assign rom[838]=-1947906132; assign rom[839]=-1942316645; assign rom[840]=-1936653889; assign rom[841]=-1930918075; assign rom[842]=-1925109422; assign rom[843]=-1919228147; assign rom[844]=-1913274473; assign rom[845]=-1907248625; assign rom[846]=-1901150829; assign rom[847]=-1894981316; assign rom[848]=-1888740319; assign rom[849]=-1882428072; assign rom[850]=-1876044815; assign rom[851]=-1869590787; assign rom[852]=-1863066233; assign rom[853]=-1856471398; assign rom[854]=-1849806531; assign rom[855]=-1843071884; assign rom[856]=-1836267710; assign rom[857]=-1829394267; assign rom[858]=-1822451813; assign rom[859]=-1815440611; assign rom[860]=-1808360925; assign rom[861]=-1801213022; assign rom[862]=-1793997172; assign rom[863]=-1786713647; assign rom[864]=-1779362721; assign rom[865]=-1771944672; assign rom[866]=-1764459780; assign rom[867]=-1756908327; assign rom[868]=-1749290598; assign rom[869]=-1741606881; assign rom[870]=-1733857465; assign rom[871]=-1726042642; assign rom[872]=-1718162708; assign rom[873]=-1710217959; assign rom[874]=-1702208696; assign rom[875]=-1694135220; assign rom[876]=-1685997836; assign rom[877]=-1677796851; assign rom[878]=-1669532574; assign rom[879]=-1661205318; assign rom[880]=-1652815396; assign rom[881]=-1644363124; assign rom[882]=-1635848822; assign rom[883]=-1627272811; assign rom[884]=-1618635414; assign rom[885]=-1609936957; assign rom[886]=-1601177768; assign rom[887]=-1592358178; assign rom[888]=-1583478520; assign rom[889]=-1574539127; assign rom[890]=-1565540339; assign rom[891]=-1556482493; assign rom[892]=-1547365932; assign rom[893]=-1538190999; assign rom[894]=-1528958041; assign rom[895]=-1519667407; assign rom[896]=-1510319445; assign rom[897]=-1500914510; assign rom[898]=-1491452956; assign rom[899]=-1481935139; assign rom[900]=-1472361420; assign rom[901]=-1462732158; assign rom[902]=-1453047717; assign rom[903]=-1443308464; assign rom[904]=-1433514764; assign rom[905]=-1423666987; assign rom[906]=-1413765506; assign rom[907]=-1403810692; assign rom[908]=-1393802923; assign rom[909]=-1383742575; assign rom[910]=-1373630029; assign rom[911]=-1363465664; assign rom[912]=-1353249866; assign rom[913]=-1342983019; assign rom[914]=-1332665510; assign rom[915]=-1322297729; assign rom[916]=-1311880067; assign rom[917]=-1301412917; assign rom[918]=-1290896673; assign rom[919]=-1280331733; assign rom[920]=-1269718495; assign rom[921]=-1259057359; assign rom[922]=-1248348728; assign rom[923]=-1237593005; assign rom[924]=-1226790596; assign rom[925]=-1215941909; assign rom[926]=-1205047353; assign rom[927]=-1194107339; assign rom[928]=-1183122279; assign rom[929]=-1172092589; assign rom[930]=-1161018683; assign rom[931]=-1149900980; assign rom[932]=-1138739900; assign rom[933]=-1127535862; assign rom[934]=-1116289291; assign rom[935]=-1105000610; assign rom[936]=-1093670244; assign rom[937]=-1082298622; assign rom[938]=-1070886173; assign rom[939]=-1059433326; assign rom[940]=-1047940514; assign rom[941]=-1036408171; assign rom[942]=-1024836731; assign rom[943]=-1013226631; assign rom[944]=-1001578310; assign rom[945]=-989892205; assign rom[946]=-978168759; assign rom[947]=-966408413; assign rom[948]=-954611611; assign rom[949]=-942778799; assign rom[950]=-930910422; assign rom[951]=-919006928; assign rom[952]=-907068766; assign rom[953]=-895096387; assign rom[954]=-883090242; assign rom[955]=-871050785; assign rom[956]=-858978468; assign rom[957]=-846873748; assign rom[958]=-834737082; assign rom[959]=-822568927; assign rom[960]=-810369741; assign rom[961]=-798139987; assign rom[962]=-785880124; assign rom[963]=-773590615; assign rom[964]=-761271924; assign rom[965]=-748924515; assign rom[966]=-736548855; assign rom[967]=-724145409; assign rom[968]=-711714647; assign rom[969]=-699257037; assign rom[970]=-686773048; assign rom[971]=-674263153; assign rom[972]=-661727822; assign rom[973]=-649167528; assign rom[974]=-636582747; assign rom[975]=-623973951; assign rom[976]=-611341617; assign rom[977]=-598686221; assign rom[978]=-586008241; assign rom[979]=-573308155; assign rom[980]=-560586442; assign rom[981]=-547843582; assign rom[982]=-535080056; assign rom[983]=-522296345; assign rom[984]=-509492931; assign rom[985]=-496670297; assign rom[986]=-483828928; assign rom[987]=-470969307; assign rom[988]=-458091920; assign rom[989]=-445197252; assign rom[990]=-432285790; assign rom[991]=-419358020; assign rom[992]=-406414432; assign rom[993]=-393455512; assign rom[994]=-380481749; assign rom[995]=-367493634; assign rom[996]=-354491656; assign rom[997]=-341476305; assign rom[998]=-328448072; assign rom[999]=-315407450; assign rom[1000]=-302354930; assign rom[1001]=-289291003; assign rom[1002]=-276216164; assign rom[1003]=-263130905; assign rom[1004]=-250035720; assign rom[1005]=-236931103; assign rom[1006]=-223817548; assign rom[1007]=-210695550; assign rom[1008]=-197565604; assign rom[1009]=-184428205; assign rom[1010]=-171283849; assign rom[1011]=-158133031; assign rom[1012]=-144976248; assign rom[1013]=-131813997; assign rom[1014]=-118646772; assign rom[1015]=-105475073; assign rom[1016]=-92299394; assign rom[1017]=-79120233; assign rom[1018]=-65938088; assign rom[1019]=-52753456; assign rom[1020]=-39566833; assign rom[1021]=-26378718; assign rom[1022]=-13189608; assign rom[1023]=0; endmodule
四、仿真代码及仿真结果
这里设时钟是22.144,那么根据奈奎斯特理论,这里的采样频率需要44。
`timescale 1ns/1ps module tb_dds(); parameter kHz=44;//根据奈奎斯特理论 只有采样频率高于原始信号最高频率的两倍时 才能把正弦波波形对应的数据还原成为原来波形 reg sys_clk; reg [9:0]sin_addr; wire signed[31:0]sin; wire signed[31:0]cos; initial begin sys_clk=0; #313333 sys_clk=0; end always #11.072 sys_clk=~sys_clk; reg sys_rst_n; initial begin sys_rst_n=1; #10000 sys_rst_n=0; #100000 sys_rst_n=1; end //相位积累控制器 reg [9:0]cnt; always @(posedge sys_clk or negedge sys_rst_n) begin if(!sys_rst_n) begin sin_addr <= 0; cnt <= 0; end else if(cnt == kHz-1) begin cnt <= 0; sin_addr <= sin_addr +10'd1; end else begin cnt <= cnt + 1; sin_addr <= sin_addr; end end dds_rom u_dds_rom( .sys_clk (sys_clk), .sin_addr (sin_addr), .sin (sin), .cos (cos) ); endmodule