灏忔暩(sh霉)鍒嗛牷鍣ㄧ殑瀵︾従(xi脿n)鏂规硶寰堝��,浣嗗叾鍩烘湰鍘熺悊涓�妯�,鍗冲湪鑻ュ共鍊嬪垎闋诲懆鏈熶腑閲囧彇鏌愮ó鏂规硶浣挎煇骞惧�嬪懆鏈熷�氳▓鎴栧皯瑷�1鍊嬫暩(sh霉),鍗冲悶鑴堟矕鎴栨彃鍏ヨ剤娌栫殑鏂规硶,寰炶�屽湪骞冲潎鎰忕京涓婄嵅寰�1鍊嬪皬鏁�(sh霉)鍒嗛牷姣�,瑷�瑕侀�茶�屽垎闋绘瘮鐐篘鐨勫皬鏁�(sh霉)鍒嗛牷,N鍙�琛ㄧず鐐篘=K+10-nX寮忎腑,n,K,X鍧囩偤姝ｆ暣鏁�(sh霉);n鐐哄埌X鐨勪綅鏁�(sh霉),鍗砃鏈塶浣嶅皬鏁�(sh霉)銆�
    鍙︿竴鏂归潰,鍒嗛牷姣斿張鍙�浠ュ��鎴�:N=M/P寮忎腑:M鐐哄垎闋诲櫒杓稿叆鑴堟矕鏁�(sh霉);P鐐鸿几鍑鸿剤娌栨暩(sh霉)銆侻=NP=(K+10-nX)P浠�P=10n,鍓囨湁M=10nK+X浠ヤ笂鏄�灏忔��(sh霉)鍒嗛牷鍣ㄧ殑涓�绋�瀵︾��(xi脿n)鏂规硶,鍗冲湪閫茶��10nK娆″垎闋绘檪,瑷�娉曞�氳几鍏�X鍊嬭剤娌�銆�

    鏁村�嬮浕璺�鐢辨暣鏁�(sh霉)/鍗婃暣鏁�(sh霉)鍒嗛牷鍣ㄣ�佽▓鏁�(sh霉)(10鍒嗛牷)鍣ㄥ拰璀�纰煎��銆丏瑙哥櫦(f膩)鍣�銆佽几鍑洪伕鎿囧櫒绛夌祫鎴愩�傚垎闋诲櫒瀹屾垚灏嶈几鍏ヤ俊铏熺殑鏁存暩(sh霉)鎴栧崐鏁存暩(sh霉)鍒嗛牷鍔熻兘,瑷堟暩(sh霉)鍜岃��纰奸儴鍒嗗畬鎴愯几鍏ヨ剤娌栫殑瑷堟暩(sh霉)鍜屾帶鍒朵俊铏熺敘(ch菐n)鐢熷姛鑳�,瑙哥櫦(f膩)鍣ㄧ敘(ch菐n)鐢熸帶鍒舵墍闇�瑕佺殑淇¤櫉銆俷=5,鍗冲�︾��(xi脿n)灏忔暩(sh霉)榛炲悗5浣嶅垎闋�銆傚師鐞嗗湒鍜岀▼搴忕殑灏嶆噳闂滅郴鐐�:5鍊嬮爯缃�鏁�(sh霉)(E銆丗銆丟)寰炲乏鍒板彸渚濇�¤�樼偤pdata0銆乸data1銆乸data2銆乸data3銆乸data4,杓稿嚭鏁�(sh霉)鎿�(j霉)閬告搰鍣ㄧ殑閬告搰绔�瑷樼偤equal05,鍒嗛牷绯绘暩(sh霉)鐨勬暣鏁�(sh霉)閮ㄥ垎瑷樼偤datain銆�
    瑭查浕璺�鏄�鍦ㄥ柈鐗囨�熸垨CPLD鐨勫叾瀹冩ā濉婇厤鍚堜笅宸ヤ綔鐨�,鐣堕渶瑕佸�︾��(xi脿n)鏌愬�嬬郴鏁�(sh霉)鐨勫垎闋绘檪,鍠�鐗囨�熺瓑鎺у埗闆昏矾鍚戣┎妯″�婅ō缃�鍙冩暩(sh霉),鍖呮嫭鍒嗛牷绯绘暩(sh霉)鐨勬暣鏁�(sh霉)閮ㄥ垎銆侀爯缃�鏁�(sh霉)銆乭ight05銆佸拰equal05銆傜暥鍒嗛牷绯绘暩(sh霉)N=0.5鏅�,equal05=1,鏁存暩(sh霉)鍒嗛牷绯绘暩(sh霉)鐐篘銆傜暥鍒嗛牷绯绘暩(sh霉)N鈮�0.5鏅�,濡傛灉灏忔暩(sh霉)閮ㄥ垎灏忎簬0.5,濡傚垎闋荤郴鏁�(sh霉)鐐篘=0.23456,鍓囨帶鍒舵柟娉曠偤equal05=0銆乭igh05=0銆乨atain=N銆乸data0銆乸data1銆乸data2銆乸data3銆乸data4鍒嗗垾鐐�2銆�3銆�4銆�5銆�6;灏忔暩(sh霉)閮ㄥ垎澶т簬0.5鏅�,鍓囩敤1娓涘幓灏忔暩(sh霉)閮ㄥ垎鍚庣殑宸�鍊间綔鐐洪爯缃�鏁�(sh霉),濡傚垎闋荤郴鏁�(sh霉)鐐篘=0.76567,鍓囨帶鍒舵柟娉曠偤equal05=0銆乭igh05=1銆乨atain=N銆乸data0銆乸data1銆乸data2銆乸data3銆乸data4鍒嗗垾鐐�2銆�3銆�4銆�3銆�3,鍗硃data0銆乸data1銆乸data2銆乸data3銆乸data4=1-0.76567=0.23433銆�
    瑷堟暩(sh霉)鍣�(10鍒嗛牷)鍜岃��纰煎櫒灏辨槸纰哄畾杓稿叆澶氬皯鍊嬭剤娌�,鍦ㄦ暣鏁�(sh霉)/鍗婃暣鏁�(sh霉)鍒嗛牷鍣ㄧ殑杓稿嚭涓�澧炲姞鎴栧幓闄ゅ崐鍊嬭剤娌�銆傝┎闆昏矾灏忔暩(sh霉)鐨勪綅鏁�(sh霉)鍙�浠ユ牴鎿�(j霉)闇�瑕佷换鎰忚ō缃�,涓昏�佸彇姹轰簬CPLD鐨勭‖浠惰硣婧愭儏娉�銆�

    22婧愮▼搴忓寘鎷�闋傚堡妯″�婂拰搴曞堡妯″��,闋傚堡妯″�婁富瑕佹槸閫氶亷鍏冧欢瑾炲彞灏囧悇妯″�婇�茶�岄�ｆ帴, 鑰屽悇搴曞堡妯″�婂墖瀹屾垚鐩告噳鐨勫姛鑳姐�傚簳灞ゆā濉婁富瑕佹湁鏁存暩(sh霉)/鍗婃暣鏁�(sh霉)鍒嗛牷鍣� 銆佽▓鏁�(sh霉)鍜岃��纰煎櫒銆丏 瑙哥櫦(f膩)鍣ㄧ瓑銆備笅闈㈠儏浠嬬垂闋傚堡妯″�婂拰鍒嗛�� 銆佽��纰兼ā濉婄殑婧愮▼搴� ,绋嬪簭涓�鐨勫韩瑾�(di脿o)鐢�銆佸厓浠惰伈鏄庡拰淇¤櫉瀹氱京绛夌敱浜庣瘒骞呭潎宸插埅闄�? 銆�
    (1) 闋傚堡妯″��
    闋傚堡妯″�婂寘鎷�搴曞堡妯″�婁箣闁撶殑閫ｆ帴鍜岃几鍑轰俊铏熺殑閬告搰 2 閮ㄥ垎 ,妯″�婇�ｆ帴鐢ㄥ厓浠惰獮鍙�,杓稿嚭鐨勯伕鎿囩洿鎺ョ敤閫茬▼鎻忚堪 銆傜敱浜庢煇浜涙ā濉婄殑閫ｆ帴鏄�椤炲悓鐨�, 鐐虹瘈(ji茅)鐪佺瘒骞呰�屽張涓嶅け鍏剁附楂旀�嗘��, 宸插皣椤炲悓閮ㄥ垎鍒�闄�? 銆�
    ENTITY nbit pset pdivfre2 IS
    GENERIC( leng : INTEGER: =7);
    PORT( inclk ,EN ,reset : IN STD LOGIC ;
    high05 ,equal05 : IN STD LOGIC ;
    pdata0 , pdata1 , pdata2 , pdata3 , pdata4 : IN STD
    LOGIC VECTOR( 2 DOWNTO 0
    data in : IN STD LOGIC VECTOR( leng -1 DOWNTO0);
    outclk , test1 , test2 : OUT STD LOGIC鈥�);
    END nbit pset pdivfre2 ;
    ARCHITECTURE nppdf2 OF nbit pset pdivfre2 ISBEGIN
    outclk <= outclk tmp ;
    modecontmp<= high05 XOR ( requst0 OR requst1 OR requst2 OR requst3 OR requst4);
    ff0d <= requst0 ;ff1 d <=( NOT requst0) AND requst1 ;
    ff2d <=( NOT requst0) AND ( NOT requst1) ANDrequst2 ;
    ff3d <=( NOT requst0) AND ( NOT requst1) AND( NOT requst2) AND requst3 ;
    ff4d <=( NOT requst0) AND ( NOT requst1) AND( NOT requst2) AND ( NOT requst3) AND requst4 ;
    U0 : nbit psetp divfre 鈥旀暣鏁�(sh霉)/鍗婃暣鏁�(sh霉)鍒嗛牷PORTMAP( inclk =>inclk , EN =>EN , reset =>reset , mode con =>mode con tmp , data in =>data in ,outclk21 = >clk21 tmp , outclkn = >clkn tmp ,clkb =>clkb tmp);
    PROCESS ( equal05 , data in , pdata0 , pdata1 , pdata2 , pdata3 , pdata4)鈥旇几鍑轰俊铏熺殑閬告搰BEGINIF ( equal05 =' 0' ) THEN outclk tmp <=clkn tmp ;
    ELSIF ( equal05 = ' 1' ) THEN outclk tmp<=clk21 tmp ;
    ELSIF( data in =1 AND pdata0 =0 AND pdata1 =0 AND pdata2 =0 AND pdata3 =0 AND pdata4 =0) THENoutclk tmp <= inclk ;
    END IF ;
    END PROCESS ;
    U1 : difre dec 鈥旇▓鏁�(sh霉)璀�纰奸儴鍒嗙殑鍏冧欢閫ｆ帴PORTMAP( EN =>EN , reset =>reset , difre in
    =>clkb tmp , clr requst =>clr requst0 , pset data =>pdata0 , requst =>requst0 , cnt co =>cnt0 co);
    鈥︹��U5 : difre decPORTMAP( EN =>cnt3 co , reset =>reset , difrein =>clkb tmp , clr requst =>clr requst4 , pset data=>pdata4 , requst =>requst4 , cnt co =>cnt4 co);
    U6 : D ff PORT MAP( D =>ff0 d , reset =>GND ,CLK =>clkb tmp , outq =>ff0 q); 鈥旇Ц鐧�(f膩)鍣ㄩ儴鍒嗙殑閫ｆ帴鈥︹��U15 : D ff PORT MAP( D =>ff4 q , reset =>GND ,CLK =>inclk , outq =>clr requst4);
    END nppdf2? ;
    ( 2) 瑷堟暩(sh霉)璀�纰兼ā濉�
    瑭叉ā濉婂皪杓稿叆鑴堟矕瑷堟暩(sh霉), 浠ユ焙瀹氫綍鏅傚湪杓稿嚭涓�鎻掑叆鎴栧幓闄� 1 鍊嬭剤娌�(鍚炶剤娌�), 鎵�浠ヨ┎妯″�婄敱瑷堟��(sh霉)( 鍒嗛牷)銆佽��纰煎拰鎺у埗淇¤櫉鐢�(ch菐n)鐢熺瓑 3 閮ㄥ垎妲嬫垚 ,鍏朵腑璀�纰奸儴鍒嗙殑婧愮▼搴忕敤娴佺▼鍦栬〃绀�? :
    BEGIN
    PROCESS( difre in , reset , EN)鈥�10 鍒嗛牷鐨勬弿杩癡ARIABLE state : INTEGER RANGE 0 TO 1 ;
    BEGINIF reset =' 1' THEN count q <=( OTHERS =>' 0' );
    ELSIF ( difre in' EVENT AND difre in =' 1' ) THENIF EN =' 1' THENIF( count q =9) THENcount q <=鈥�0000鈥� ;
    cnt co <=' 1' ;
    ELSE count q <=count q +' 1' ;
    cnt co <=' 0' ;
    END IF ;
    ELSE cnt co <=' 0' ;
    count q <=count q ;
    END IF ;
    END IF ;
    END PROCESS ;
    鈥旇��纰奸�茬▼( 瑕嬪彸鍋存祦绋嬪湒)PROCESS ( dec out ,clr requst)
    鈥旀帶鍒朵俊铏�( requst) 鐨勭敘(ch菐n)鐢�
    BEGIN
    IF( clr requst =' 1' ) THEN requst <=' 0' ;
    ELSIF( dec out' EVENT AND dec out =' 1' ) THENrequst <=' 1' ;
    END IF ;
    END PROCESS ;
    END dd? ;
    ( 3) N 浣嶆暣鏁�(sh霉)/鍗婃暣鏁�(sh霉)鍒嗛牷妯″�婅┎妯″�婃牴鎿�(j霉)鍠�鐗囨�熸垨 CPLD 绛夎ō缃�鐨勫弮鏁�(sh霉)涓嶅悓,鍙�浠ラ伕鎿囨暣鏁�(sh霉)鍒嗛牷杓稿嚭鎴栧崐鏁存暩(sh霉)鍒嗛牷杓稿嚭 ,鍙栨焙浜庡垎闋荤郴鏁�(sh霉)? 銆�
    BEGIN
    clk <=inclk XOR divide2 ;
    coutclk <=outclk tmp ;
    PROCESS ( clk , EN)BEGIN
    IF ( CLK' EVENT AND CLK =' 1' ) THEN
    IF ( EN =' 1' ) THEN
    IF ( cnt q =0) THEN
    FOR i IN 0 TO leng -1 LOOP
    cnt q( i)<=data in( i);
    END LOOP ;
    outclk tmp <=' 1' ;
    ELSE
    cnt q <=cnt q -1 ;
    outclk tmp <=' 0' ;
    END IF ;
    END IF ;
    END IF ;
    END PROCESS ;
    PROCESS ( outclk tmp)
    BEGIN
    IF ( outclk tmp' EVENT AND outclk tmp =' 1' ) THEN divide2 <=NOT divide2 ;
    END IF ;
    END PROCESS ;
    END nppdf ;

    灏忔暩(sh霉)鍒嗛牷鍣ㄧ殑瀵︾従(xi脿n)鏂规硶寰堝��,浣嗗叾鍩烘湰鍘熺悊涓�妯�:鍦ㄨ嫢骞插�嬪垎闋诲懆鏈熶腑閲囧彇鏌愮ó鏂规硶浣挎煇骞惧�嬪懆鏈熷皯瑷堜竴鍊嬫垨骞惧�嬫暩(sh霉),鍗冲悶鑴堟矕鍘熺悊,寰炶�屽湪鏁村�嬭▓鏁�(sh霉)鍛ㄦ湡鐨勭附楂斿钩鍧囨剰缇╀笂鐛插緱涓�鍊嬪皬鏁�(sh霉)鍒嗛牷姣斻�備互涓嬬啊瑕佽��鏄庝笁绋�姣旇純甯哥敤鐨勫皬鏁�(sh霉)鍒嗛牷闆昏矾鐨勫師鐞嗗強瑷�瑷堟柟娉�:
    鐢˙CD姣斾緥涔樻硶鍣�4527鍔犳硶绱氳伅(li谩n)鑳藉皪鍩洪牷閫茶��10n/X鍊嶅垎闋�,鍏朵腑,n鐐�4527鐨勭礆鑱�(li谩n)绱氭暩(sh霉),X鐐哄皪4527鐨勭疆鏁�(sh霉);绌嶅垎鍒嗛牷鍣ㄦ槸姣旇純甯歌�嬬殑灏忔��(sh霉)鍒嗛牷鍣�,鍏跺熀鏈�鍘熺悊鏄�灏囧皬鏁�(sh霉)鍒嗛牷姣旇綁(zhu菐n)鎻涚偤鏁存暩(sh霉)姣斿��,鍐嶉噰鐢ㄨ▓鏁�(sh霉)鍣ㄥ皪杓稿叆鏅傞悩閫茶�岃▓鏁�(sh霉),鏍规摎(j霉)瑷堟暩(sh霉)鍊煎悶鎺変竴浜涜剤娌�,寰炶�屽緱鍒版墍闇�鐨勯牷鐜囪几鍑�;绱�鍔犲櫒鍒嗛牷鍓囨槸涓�绋�鍩轰簬鐩镐綅绱�鍔犲櫒鍩烘湰鍘熺悊鐨勪竴绋�鍒嗛牷鎶�琛�,灏囩疮鍔犲櫒浣嶄綔鐐哄垎闋昏几鍑�,鏍规摎(j霉)閫佸叆绱�鍔犲櫒涓�涓嶅悓鐨勭疮鍔犳�ラ暦鏀硅畩鍒嗛牷鍊嶆暩(sh霉)銆�
    1銆侀噰鐢˙CD涔樻硶鍣�4527瀵︾従(xi脿n)
    BCD姣斾緥涔樻硶鍣�4527鎺ユ垚鍔犳硶绱氳伅(li谩n)鏂瑰紡,CLK绔�杓稿叆鍩烘簴鏅傞悩闋荤巼fin鐢辨櫠鎸�闆昏矾鎻愪��,楂樹綅缃�鏁�(sh霉)K1,浣庝綅缃�鏁�(sh霉)K2,鍦�10鍊婥LK鑴堟矕鍏�(n猫i)4527(1)杓稿嚭K1鍊嬭剤娌�,鍚屾檪鐢盜NHOUT绂佹��浣庝綅4527(2)灏岰LK閫茶�屾瘮渚嬪垎閰�,K1鍊嬭剤娌栫洿閫�4527(2)閫佸嚭銆�10鍊婥LK鑴堟矕绲愭潫鏅�,INHOUT鐧�(f膩)鍑鸿剤娌栧厑瑷�4527(2)鐨凜LK閫插叆,鍓囧彲鏈変竴鍊嬭剤娌栨彃鍏ャ�傚�傛�や笅鍘�,鍦�100鍊婥LK鑴堟矕鍏�(n猫i),鏈冩湁10脳K1鍊嬭剤娌栫洿閫氶�佸嚭,浠ュ強10鍊婭NHOUT鑴堟矕,閫欐ǎ杓稿嚭绔痜out渚挎湁K2鍊嬭剤娌栨彃鍏�,鍏遍�佸嚭(10K1+K2)鍊嬭剤娌�,鍗宠几鍑烘檪閻橀牷鐜�:fout=(10K1+K2)fin/100(1)
    濡傚悓涓婅堪,n绱�4527绱氳伅(li谩n),闋愮疆鏁�(sh霉)鍒嗗垾鐐篕1,K2,鈥︹��,Kn鍚�,瑷瑿LK鏅傞悩绔�杓稿叆鐨勫熀婧栨檪閻橀牷鐜囩偤fin,鍓囩礆鑱�(li谩n)杓稿嚭闋荤巼:fout=fin(10n-1脳K1+10n-2脳K2+鈥�+10脳Kn-1+Kn)/10n鍏朵腑鐐簄鐗�4527鐨勯爯缃�鏁�(sh霉),鏀硅畩闋愮疆鏁�(sh霉)鍗冲彲鏂逛究鍦版敼璁婅几鍑洪牷鐜�銆�
    2銆佺�嶅垎鍒嗛牷鍣�
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