DDR纭欢瑷�(sh猫)瑷�(j矛)瑕侀粸(di菐n)

1.闆绘簮DDR鐨勯浕婧愬彲浠ュ垎鐐轰笁椤烇細

a涓婚浕婧怴DD鍜孷DDQ锛屼富闆绘簮鐨勮姹傛槸VDDQ=VDD锛孷DDQ鏄郸IObuffer渚涢浕鐨勯浕婧�锛孷DD鏄郸浣嗘槸涓€鑸殑浣跨敤涓兘鏄妸VDDQ鍜孷DD鍚堟垚涓€鍊�(g猫)闆绘簮浣跨敤銆�

鏈夌殑鑺墖閭勬湁VDDL锛屾槸绲LL渚涢浕鐨�锛屼篃鍜孷DD浣跨敤鍚屼竴闆绘簮鍗冲彲銆傞浕婧愯ō(sh猫)瑷�(j矛)鏅�(sh铆)锛岄渶瑕佽€冩叜闆诲锛岄浕娴佹槸鍚︽豢瓒宠姹�锛岄浕婧愮殑涓婇浕闋嗗簭鍜岄浕婧愮殑涓婇浕鏅�(sh铆)闁擄紝鍠(di脿o)鎬х瓑銆傞浕婧愰浕澹撶殑瑕佹眰涓€鑸湪卤5%浠ュ収(n猫i)銆傞浕娴侀渶瑕佹牴鎿�(j霉)浣跨敤鐨勪笉鍚岃姱鐗�锛屽強鑺墖鍊�(g猫)鏁�(sh霉)绛夐€�(j矛n)琛岃▓(j矛)绠椼€傜敱浜嶥DR鐨勯浕娴佷竴鑸兘姣旇純澶�锛屾墍浠CB瑷�(sh猫)瑷�(j矛)鏅�(sh铆)锛屽鏋滄湁涓€鍊�(g猫)瀹屾暣鐨勯浕婧愬钩闈㈤嫪鍒扮鑵充笂锛屾槸鏈€鐞嗘兂鐨勭媭鎱�(t脿i)锛屽苟涓斿湪闆绘簮鍏ュ彛鍔犲ぇ闆诲鍎�(ch菙)鑳�锛屾瘡鍊�(g猫)绠¤叧涓婂姞涓€鍊�(g猫)100nF~10nF鐨勫皬闆诲婵炬尝銆�

b鍙冭€冮浕婧怴ref锛屽弮鑰冮浕婧怴ref瑕佹眰璺熼毃VDDQ锛屽苟涓擵ref=VDDQ/2锛屾墍浠ュ彲浠ヤ娇鐢ㄩ浕婧愯姱鐗囨彁渚�锛屼篃鍙互閲囩敤闆婚樆鍒嗗鐨勬柟寮忓緱鍒般€傜敱浜嶸ref涓€鑸浕娴佽純灏�锛屽湪骞惧€�(g猫)mA~骞惧崄mA鐨勬暩(sh霉)閲忕礆(j铆)锛屾墍浠ョ敤闆婚樆鍒嗗鐨勬柟寮�锛屽嵆绡€(ji茅)绱勬垚鏈�锛屽張鑳藉湪甯冨眬涓婃瘮杓冮潏娲�锛屾斁缃殑闆ref绠¤叧姣旇純杩�锛岀穵瀵嗙殑璺熼毃VDDQ闆诲锛屾墍浠ュ缓璀颁娇鐢ㄦ绋柟寮�銆傞渶瑕佹敞鎰忓垎澹撶敤鐨勯浕闃诲湪100~10K鍧囧彲锛岄渶瑕佷娇鐢�1%绮惧害鐨勯浕闃�銆俈ref鍙冭€冮浕澹撶殑姣忓€�(g猫)绠¤叧涓婇渶瑕佸姞10nF鐨勯粸(di菐n)瀹规烤娉�锛屽苟涓旀瘡鍊�(g猫)鍒嗗闆婚樆涓婁篃骞惰伅(li谩n)涓€鍊�(g猫)闆诲杓冨ソ銆�

C銆佺敤浜庡尮閰嶇殑闆诲VTT(TrackingTerminationVoltage)

VTT鐐哄尮閰嶉浕闃讳笂鎷夊埌鐨勯浕婧�锛孷TT=VDDQ/2銆侱DR鐨勮ō(sh猫)瑷�(j矛)涓紝鏍规摎(j霉)鎷�?f霉)娴(ji茅)妲�(g貌u)鐨勪笉鍚�锛屾湁鐨勮ō(sh猫)瑷�(j矛)浣跨敤涓嶅埌VTT锛屽鎺у埗鍣ㄥ付鐨凞DR鍣ㄤ欢姣旇純灏戠殑鎯呮硜涓�銆傚鏋滀娇鐢╒TT锛屽墖VTT鐨勯浕娴佽姹傛槸姣旇純澶х殑锛屾墍浠ラ渶瑕佽蛋绶氫娇鐢ㄩ妳鐨嫪閬庡幓銆傚苟涓擵TT瑕佹眰闆绘簮鍗冲彲浠ュ惛闆绘祦锛屽張鍙互鐏岄浕娴佹墠鍙互銆備竴鑸儏娉佷笅鍙互浣跨敤灏堥杸鐐篋DR瑷�(sh猫)瑷�(j矛)鐨勭敘(ch菐n)鐢烿TT鐨勯浕婧愯姱鐗囦締婊胯冻瑕佹眰銆�

鑰屼笖锛屾瘡鍊�(g猫)鎷夊埌VTT鐨勯浕闃绘梺涓€鑸斁涓€鍊�(g猫)10Nf~100nF鐨勯浕瀹�锛屾暣鍊�(g猫)VTT闆昏矾涓婇渶瑕佹湁uF绱�(j铆)澶ч浕瀹归€�(j矛n)琛屽劜(ch菙)鑳�銆�

鍦ㄨ彲鐐虹殑瑷�(sh猫)瑷�(j矛)涓�锛屽湪浣跨敤DDR椤嗙矑鐨勬儏娉佷笅锛屽凡缍�(j墨ng)鍩烘湰鍏ㄩ儴涓嶄娇鐢╒TT闆绘簮锛屽叏閮ㄩ噰鐢ㄩ浕闃讳笂涓嬫媺鐨勬埓缍崡鍖归厤锛屽彧鏈夊湪浣跨敤鍏�(n猫i)瀛樻鐨勬儏娉佷笅鎵嶄娇鐢╒TT闆绘簮銆�

涓€鑸儏娉佷笅锛孌DR鐨勬暩(sh霉)鎿�(j霉)绶氶兘鏄竴椹�(q奴)涓€鐨勬嫇?f霉)娴(ji茅)妲�(g貌u)锛屼笖DDR2鍜孌DR3鍏�(n猫i)閮ㄩ兘鏈塐DT鍋氬尮閰�锛屾墍浠ヤ笉闇€瑕佹媺鍒癡TT鍋氬尮閰嶅嵆鍙緱鍒拌純濂界殑淇¤櫉(h脿o)璩�(zh矛)閲�銆侱DR2鐨勫湴鍧€鍜屾帶鍒朵俊铏�(h脿o)绶氬鏋滄槸澶氳矤(f霉)杓夌殑鎯呮硜涓�锛屾渻(hu矛)鏈変竴椹�(q奴)澶�锛屽苟涓斿収(n猫i)閮ㄦ矑鏈塐DT锛屽叾鎷�?f霉)娴(ji茅)妲�(g貌u)鐐鸿蛋T鍨嬬殑绲�(ji茅)妲�(g貌u)锛屾墍浠ュ父甯搁渶瑕佷娇鐢╒TT閫�(j矛n)琛屼俊铏�(h脿o)璩�(zh矛)閲忕殑鍖归厤鎺у埗銆侱DR3鍙互閲囩敤Fly-by鏂瑰紡璧扮窔锛�

涓€鍊�(g猫)DDR3瑷�(sh猫)瑷�(j矛)妗堜緥锛屼締鍒嗘瀽灏�(du矛)姣旈噰鐢ㄩ珮闃绘姉璨�(f霉)杓夎蛋绶氬拰閲囩敤涓荤窔鍜岃矤(f霉)杓夎蛋绶氬悓闃绘姉鍏╃ó鎯呮硜鐨勫樊鐣�銆�

濡備笂鍦栵紝Case1閲囩敤鐨勬槸寰炲収(n猫i)灞ゆ帶鍒跺櫒鍒板悇鍊�(g猫)SDRAM鍧囩偤50ohm鐨勯樆鎶楄ō(sh猫)瑷�(j矛)銆侰ase2鍓囬噰鐢ㄤ簡涓荤窔40ohm,璨�(f霉)杓夌窔60ohm鐨勮ō(sh猫)瑷�(j矛)銆傚皪(du矛)姝ら€氶亷浠跨湡宸ュ叿閫�(j矛n)琛屽皪(du矛)姣斿垎鏋�銆�

寰炰互涓婁豢鐪熸尝褰㈠彲浠ョ湅鍑�锛屼娇鐢ㄨ純楂橀樆鎶楄矤(f霉)杓夎蛋绶氱殑Case2鍦ㄤ俊铏�(h脿o)璩�(zh矛)閲忎笂鏄庨’鍎�(y艒u)浜庡垎鏀富绶氶兘閲囩敤鍚屼竴绋樆鎶楃殑Case1瑷�(sh猫)瑷�(j矛)銆傝€屼笖灏�(du矛)闈犺繎椹�(q奴)鍕�(d貌ng)绔殑璨�(f霉)杓夊奖闊挎渶澶�锛岄仩(yu菐n)闆㈤﹨(q奴)鍕�(d貌ng)绔殑鏈€鏈鐨勮矤(f霉)杓夊奖闊胯純灏忋€傞€欏€�(g猫)姝ｆ槸鍓嶉潰鎵€鍒嗘瀽鍒扮殑锛岃矤(f霉)杓夌殑鍒嗗竷闆诲灏�(d菐o)鑷翠簡璨�(f霉)杓夌窔閮ㄥ垎鐨勯樆鎶楅檷浣�锛屽鏋滈噰鐢ㄤ富绶氬拰璨�(f霉)杓夌窔鍚岄樆鎶楄ō(sh猫)瑷�(j矛)锛屽弽鑰屽皫(d菐o)鑷翠簡闃绘姉涓嶉€ｇ簩(x霉)鐨勭櫦(f膩)鐢熴€傛妸璨�(f霉)杓夎蛋绶氳ō(sh猫)瑷�(j矛)鐐鸿純楂樼殑闃绘姉锛岀敤浜庡钩琛¤矤(f霉)杓夊紩鍏ョ殑鍒嗗竷闆诲锛屽緸鑰屽彲浠ラ仈(d谩)鍒版暣姊濊蛋绶氶樆鎶楀钩琛＄殑鐩殑銆�

閫氶亷鎻愰珮璨�(f霉)杓夎蛋绶氶樆鎶椾締骞宠　璨�(f霉)杓夐浕瀹圭殑鍋氭硶锛屽叾瀵�(sh铆)鍦ㄤ互寰€鐨勮強鑺遍張瑷�(sh猫)瑷�(j矛)涓槸缍�(j墨ng)甯哥敤鍒扮殑鏂规硶銆侱DR3绋遍€欑ó鎷�?f霉)閷囬枓ly-by锛屽叾瀵�(sh铆)鏄湁涓€瀹氱殑鍚京鐨�锛屾剰鍦ㄥ挤(qi谩ng)瑾�(di脿o)璨�(f霉)杓塻tub璧扮窔瓒冲鐨勭煭銆�

2.鏅�(sh铆)閻�

DDR鐨勬檪(sh铆)閻樼偤宸垎璧扮窔锛屼竴鑸娇鐢ㄧ祩绔苟鑱�(li谩n)100姝愬鐨勫尮閰嶆柟寮忥紝宸垎璧扮窔宸垎灏�(du矛)鎺у埗闃绘姉鐐�100ohm锛屽柈绔窔50ohm銆傞渶瑕佹敞鎰忕殑鏄�锛屽樊鍒嗙窔涔熷彲浠ヤ娇鐢ㄤ覆鑱�(li谩n)鍖归厤锛屼娇鐢ㄤ覆鑱�(li谩n)鍖归厤鐨勫ソ铏曟槸鍙互鎺у埗宸垎淇¤櫉(h脿o)鐨勪笂鍗囨部绶╁害锛屽皪(du矛)EMI鍙兘鏈�(hu矛)鏈変竴瀹氱殑浣滅敤銆�

3.鏁�(sh霉)鎿�(j霉)鍜孌QS

DQS淇¤櫉(h脿o)鐩哥暥(d膩ng)浜庢暩(sh霉)鎿�(j霉)淇¤櫉(h脿o)鐨勫弮鑰冩檪(sh铆)閻�锛屽畠鍦ㄨ蛋绶氭檪(sh铆)闇€瑕佷繚鎸佸拰CLK淇¤櫉(h脿o)淇濇寔绛夐暦銆侱QS鍦―DR2浠ヤ笅鐐哄柈绔俊铏�(h脿o)锛孌DR2鍙綔鐐哄樊鍒嗕俊铏�(h脿o)锛屼篃鍙仛鍠锛屽仛鍠鏅�(sh铆)闇€瑕佸皣DQS-鎺ュ湴锛岃€孌DR3鐐哄樊鍒嗕俊铏�(h脿o)锛岄渶瑕佽蛋绶�100ohm宸垎绶�銆傜敱浜庡収(n猫i)閮ㄦ湁ODT锛屾墍浠QS涓嶉渶瑕佺祩绔苟鑱�(li谩n)100ohm闆婚樆銆傛瘡8bit鏁�(sh霉)鎿�(j霉)淇¤櫉(h脿o)灏�(du矛)鎳�(y墨ng)涓€绲凞QS淇¤櫉(h脿o)銆�

DQS淇¤櫉(h脿o)鍦ㄨ蛋绶氭檪(sh铆)闇€瑕佽垏鍚岀祫鐨凞QS淇¤櫉(h脿o)淇濇寔绛夐暦锛屾帶鍒跺柈绔�50ohm鐨勯樆鎶�銆傚湪瀵暩(sh霉)鎿�(j霉)鏅�(sh铆),DQ鍜孌QS鐨勪腑闁撳皪(du矛)榻婏紝鍦ㄨ畝鏁�(sh霉)鎿�(j霉)鏅�(sh铆)锛孌Q鍜孌QS鐨勯倞娌垮皪(du矛)榻娿€侱Q淇¤櫉(h脿o)澶氱偤涓€椹�(q奴)涓€锛屽苟涓擠DR2鍜孌DR3鏈夊収(n猫i)閮ㄧ殑ODT鍖归厤锛屾墍浠ヤ竴鑸湪閫�(j矛n)琛屼覆鑱�(li谩n)鍖归厤灏卞彲浠ヤ簡銆�

4.鍦板潃鍜屾帶鍒�

鍦板潃鍜屾帶鍒朵俊铏�(h脿o)閫熷害娌掓湁DQ鐨勯€熷害蹇紝浠ユ檪(sh铆)閻樼殑涓婂崌娌跨偤渚濇摎(j霉)閲囨ǎ锛屾墍浠ラ渶瑕佽垏鏅�(sh铆)閻樿蛋绶氫繚鎸佺瓑闀�銆備絾濡傛灉浣跨敤澶氱墖DDR鏅�(sh铆)锛屽湴鍧€鍜屾帶鍒朵俊铏�(h脿o)鐐轰竴椹�(q奴)澶氱殑闂�(gu膩n)绯�锛岄渶瑕佹敞鎰忓尮閰嶆柟寮忔槸鍚﹂仼鍚�銆�

5.PCB甯冨眬娉ㄦ剰浜嬮爡(xi脿ng)

PCB甯冨眬鏅�(sh铆)锛岄渶瑕佹妸DDR椤嗙矑鐩￠噺闈犺繎DDR鎺у埗鍣ㄦ斁缃�銆傛瘡鍊�(g猫)闆绘簮绠¤叧闇€瑕佹斁缃竴鍊�(g猫)婵炬尝闆诲锛屾暣鍊�(g猫)闆绘簮涓婇渶瑕佹湁10uF浠ヤ笂澶ч浕瀹规斁鍦ㄩ浕婧愬叆鍙ｇ殑浣嶇疆涓�銆傞浕婧愭渶濂戒娇鐢ㄧ崹(d煤)绔嬬殑灞ら嫪鍒扮鑵充笂鍘�銆備覆鑱�(li谩n)鍖归厤鐨勯浕闃绘渶濂芥斁鍦ㄦ簮绔紝濡傛灉鏄洐鍚戜俊铏�(h脿o)锛岄偅涔堣绲�(t菕ng)涓€鏀惧湪鍚屼竴绔€傚鏋滄槸涓€椹�(q奴)澶氱殑DDR鍖归厤绲�(ji茅)妲�(g貌u)锛孷TT涓婃媺闆婚樆闇€瑕佹斁鍦ㄦ渶閬�(yu菐n)绔紝娉ㄦ剰鑺墖鐨勬帓甯冮渶瑕佸钩琛�銆備笅鍦栨槸骞剧óDDR鐨勬嫇?f霉)娴(ji茅)妲�(g貌u)锛岄鍏�锛屼竴椹�(q奴)浜岀殑鎯呮硜涓嬪垎鐐烘ü鐙€绲�(ji茅)妲�(g貌u)锛岃強鑺遍張鍜孎ly-by绲�(ji茅)妲�(g貌u)锛孎(xi脿n)ly-by鏄竴绋甋TUB寰堝皬鐨勮強鑺遍張绲�(ji茅)妲�(g貌u)銆侱DR2鍜孌DR3璧拌強鑺遍張绲�(ji茅)妲�(g貌u)閮芥槸姣旇純閬╁悎鐨�銆傝蛋妯圭媭绲�(ji茅)妲�(g貌u)鍙互鎶婂叐鐗囪姱鐗囪布鍦≒CB鐨勬鍙嶅叐闈�锛屽皪(du矛)璨兼笡灏忓垎鍙夌殑闀峰害銆備竴椹�(q奴)澶氱殑DDR鎷�?f霉)娴(ji茅)妲�(g貌u)姣旇純寰�(f霉)闆�锛岄渶瑕佷粩绱�(x矛)閫�(j矛n)琛屼豢鐪�銆�

6.PCB甯冪窔娉ㄦ剰浜嬮爡(xi脿ng)

PCB甯冪窔鏅�(sh铆)锛屽柈绔蛋绶氳蛋50ohm锛屽樊鍒嗚蛋绶氳蛋100ohm闃绘姉銆�

娉ㄦ剰鎺у埗宸垎绶氱瓑闀仿�10mil浠ュ収(n猫i)锛屽悓绲勮蛋绶氭牴鎿�(j霉)閫熷害鐨勮姹備篃鏈変笉鍚岋紝涓€鑸偤卤50mil銆�

鎺у埗鍜屽湴鍧€绶氬強DQS绶氬拰鏅�(sh铆)閻樼瓑闀凤紝DQ鏁�(sh霉)鎿�(j霉)绶氬拰鍚岀祫鐨凞QS绶氱瓑闀�銆�

娉ㄦ剰鏅�(sh铆)閻樺強DQS鍜屽叾浠栫殑淇¤櫉(h脿o)瑕佸垎闁�3W浠ヤ笂璺濋洟銆�

绲勯枔淇¤櫉(h脿o)涔熻鎷夐枊鑷冲皯3W瀵殑璺濋洟銆�

鍚屼竴绲勪俊铏�(h脿o)鏈€濂藉湪鍚屼竴灞ゅ竷绶氥€�

鐩￠噺娓涘皯閬庡瓟鐨勬暩(sh霉)鐩�銆�

7.EMI鍟忛

DDR鐢变簬鍏堕€熷害蹇紝瑷晱闋荤箒锛屾墍浠ュ湪瑷卞瑷�(sh猫)瑷�(j矛)涓渶瑕佽€冩叜鍏跺皪(du矛)澶栫殑骞叉摼鎬�锛屽湪瑷�(sh猫)瑷�(j矛)鏅�(sh铆)闇€瑕佹敞鎰忎竴涓嬪咕榛�(di菐n)

鍘熺悊鏈夋€ц兘鎸囨(bi膩o)瑕佹眰鐨勶紝鏄撳彈骞叉摼鐨勯浕璺ā濉婂拰淇¤櫉(h脿o)锛屽妯℃摤淇¤櫉(h脿o)锛屽皠闋讳俊铏�(h脿o)锛屾檪(sh铆)閻樹俊铏�(h脿o)绛夛紝闃叉DDR灏�(du矛)鍏跺共鎿�锛屽奖闊挎寚妯�(bi膩o)銆�

DDR鐨勯浕婧愬拰涓嶈鑸囧叾浠栨槗鍙楀共鎿剧殑闆绘簮妯″浣跨敤鍚屼竴闆绘簮锛屽蹇呴爤浣跨敤鍚屼竴闆绘簮锛岃娉ㄦ剰浣跨敤闆绘劅銆佺鐝犳垨闆诲閫�(j矛n)琛屾烤娉㈤殧闆㈣檿鐞�銆�

鍦ㄦ檪(sh铆)閻樺強DQS淇¤櫉(h脿o)绶氫笂锛岄爯(y霉)鐣欎竴浜涘彲浠ュ鍔犵殑涓茶伅(li谩n)闆婚樆鍜屽苟鑱�(li谩n)闆诲鐨勪綅缃紝鍦‥MI瓒呭嚭妯�(bi膩o)婧�(zh菙n)鏅�(sh铆)锛屽湪淇¤櫉(h脿o)瀹屾暣鎬у厑瑷辩殑鑼冨湇鍏�(n猫i)澧炲ぇ涓茶伅(li谩n)闆婚樆鎴�?q奴)桅浠夊?锛屼娇鍏朵俊?h脿o)涓婂崌寤惰畩绶╋紝娓涘皯灏�(du矛)澶栫殑杓诲皠銆�

閫�(j矛n)琛屽睆钄借檿鐞�锛屼娇鐢ㄩ噾灞娈肩殑灞忚斀绲�(ji茅)妲�(g貌u)锛屽睆钄藉皪(du矛)澶栬蓟灏�銆�

娉ㄦ剰淇濇寔鍦扮殑瀹屾暣鎬�銆�

8.娓�(c猫)瑭︽柟娉�

娉ㄦ剰绀烘尝鍣ㄧ殑鎺㈤牠鍜岀ず娉㈠櫒鏈韩鐨勫付瀵兘澶犳豢瓒虫脯(c猫)瑭﹁姹�銆�

娓�(c猫)瑭﹂粸(di菐n)鐨勯伕鎿囪娉ㄦ剰閬稿埌鐩￠噺闈犺繎淇¤櫉(h脿o)鐨勬帴鍙楃銆�

鐢变簬DDR淇′护姣旇純寰�(f霉)闆�锛屽洜姝ょ偤浜嗚兘蹇€熸脯(c猫)瑭︺€佽(di脿o)瑭﹀拰瑙ｆ焙淇¤櫉(h脿o)涓婄殑鍟忛锛屾垜鍊戝笇鏈涜兘绨″柈鍦板垎闆㈣畝/瀵瘮鐗�銆傛鏅�(sh铆)锛屾渶甯哥敤鐨勬槸閫氶亷鐪煎湒鍒嗘瀽渚嗗公鍔╂鏌DR淇¤櫉(h脿o)鏄惁婊胯冻闆诲銆佸畾鏅�(sh铆)鍜屾姈鍕�(d貌ng)鏂归潰鐨勮姹傘€�

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娓�(c猫)瑭︿腑瑕佹敞鎰忎俊铏�(h脿o)鐨勫箙搴�锛屾檪(sh铆)閻樼殑闋荤巼锛屽樊鍒嗘檪(sh铆)閻樼殑浜ゅ弶榛�(di菐n)锛屼笂鍗囨部鏄惁鍠(di脿o)锛岄亷娌栫瓑銆�

鏅�(sh铆)搴忎腑鏈€閲嶈锛屾渶闇€瑕佹敞鎰忕殑灏辨槸寤虹珛鏅�(sh铆)闁撳拰淇濇寔鏅�(sh铆)闁�銆�