标题: BGA?????????¨×??ù?? [打印本页]

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作者: apple    时间: 2004-3-18 17:50     标题: BGA?????????¨×??ù??

BGA??PCB????????×é?????¨??CPU??NORTH BRIDGE??SOUTH BRIDGE??AGP CHIP??CARD BUS CHIP???????ó?à????bga??????°ü×°???ò??????80?????????????°???????????á?????à????package?????????ò???????????íBGA package??×????????????????á?????ó???°?ì??
?¨???·????BGA???ü????????????????????????????·??????à??
1. by pass??
2. clock????RC???·??
3. damping?¨????????×è????×é??????????????memory BUS??????
4. EMI RC???·?¨??dampin??C??pull height??????????????USB????????
5. ???ü???????·?¨????????CHIP?ù???????????·??????CPU?????????·????
6. 40mil?????????????·×é?¨??C??L??R???????????????????·????????AGP CHIP or??AGP??????CHIP???ü??????R??L·???????????????×é????
7. pull low R??C??
8. ??°??????·×é?¨??R??C??Q??U??????????????×??????ó????
9. pull height R??RP??
1-6???????·?¨????placement?????????á???????????üBGA?????è????±????í??????7?????·???????????????????á????±??????üBGA??8??9??????°????????·????????????????????????
?à????????BGA???ü??????????????????????????????ROUTING?????è?ó??????
1.by pass =>??CHIP???????±???±????CHIP pin????by pass??????by pass?????òvia??plane????CHIP???????±??????BGA??VCC??GND pin???í??????via?????¤????????100mil??

2.clock????RC???·=>?????í?????à?????¤?ò°üGND???è?ó??×???????????????????????????VCC·???????
3.damping=>?????í?????à?????¤?°·?×é×??????è?ó??×???????????????????×é??×é×????????????????ü??????
4.EMI RC???·=>?????í?????à??????×?????°üGND???è?ó???????§???ó?ê????
5.???ü???????·=>?????í??°üGND?ò×??????????è?ó???????§???ó?ê????
6.40mil?????????????·×é=>?????í???è?ó????????±í?????ê???????????????ê??±???????????????????????±?????????????BGA?????????????ì????±???????????
7.pull low R??C=>?????????ó??×?????????
8.??°??????·×é=>?????????ó??×?????????
9.pull height R??RP=> ?????????ó??×?????????

?????ü?????????÷BGA????×????????í??????????????±ê???÷??????


A. ??BGA??????????×???·???VIA·?±???×ó????×ó??????????????·??ò?ò????×????ò×????è??×????????÷????
B. clock?????????í?????à???ó???±??R??C???·??CHIP???????±????????????·??????í??
C. USB??????R??C???????ê??????×?????
D. by pass??????CHIP pin????by pass??????plane????·¨??????by pass?????ü??plane??
E.  BGA×é?????????????????ù????????±??????è?¨???í?????à??VIA?????????????°3MM placement?????????÷??×??????ò??????×??????????????ó???ò???????¤????×????????????ù?????òVIA?ò??PIN??PIN?????????í????BGA??????????????????±í??????????????????????VIA????
F. BGA×é????????????????·????????ò????????±???????????×???

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作者: apple    时间: 2004-3-18 17:50


F_2 ??BGA±???by pass??·????°×??????í??

By pass???????ü????pin??

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作者: apple    时间: 2004-3-18 17:51




F_3 ??BGA????VIA??VCC???ù?ì????×???

THERMAL VCC??????VCC???????¨×?????
ANTI  GND??????VCC????????×?????
?òBGA???????????ò???????????òVIA???????????????¨????×???

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作者: apple    时间: 2004-3-18 17:52



F_4 ??BGA????VIA??GND???ù?ì????×???
THERMAL GND??????GND???????¨×?????
ANTI  VCC??????GND????????×?????
?òBGA???????????ò???????????òVIA???????????????¨????×?

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作者: apple    时间: 2004-3-18 17:53



F_5 ??BGA????Placement?°×????¨?é??

?????ù×???BGA×????¨?é????×÷????????
1. ?????ò?????????????????????????í????????±í?????????à×????????????ù???ó?????í?????à?ê????
2. BGA??????VCC??GND?á?ò???????????????¨????
3. BGA????????×???·????????????±BGA?????????????????????×??VCC???????±??????×????????í?¨40~80MIL???????????????????òBGA±??í??CLOCK???ò???ü?????ó???í?????à???????ò×?????
4. ??????BGA×????°placement??????BGA×??í??????????????×?????

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作者: apple    时间: 2004-3-18 17:54

???í??????????BGA layout???é???à???÷?????ù°??ú??

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作者: zona    时间: 2004-3-18 19:07

?????????÷??????????×?????°?????????????
?????÷??????????×??ù???à?à?????ü????????????

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作者: silverstar    时间: 2004-3-19 14:56

????
???????±???§???±?ò????°???????????????????????????

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作者: ????    时间: 2004-8-17 14:03

??????????????

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作者: wards    时间: 2004-8-18 00:10

???í???????÷

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作者: lcyouth    时间: 2004-8-31 14:17

????°??÷?ù?e????bga??????·N°?×????t
×??????????U??·??o????·??u

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