标题: NOR??NAND Flash?????÷????±? ---zt
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发表于 2005-12-20 11:49  资料  个人空间  短消息  加为好友 
NOR??NAND Flash?????÷????±? ---zt

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?ê??????:NOR??NAND Flash?????÷????±?

NOR??NAND?????????????????÷????·??×?§??????????Intel??1988?ê?×????·???NOR flash????,???×??±?????????EPROM??EEPROM?????ì??????????????×?,1989?ê,????????·?±í??NAND flash?á??,???÷??????±???????±?,?ü????????,?????ó???????ù?????¨???????á?????????????????????à?ê???ó,???????à?±?à???????¤????·?????NOR??NAND??????

?????à?°flash?????÷?±???????????à?°NOR?????÷?±???????????í?à??????????????????NAND?????????à????NOR??????????????,?ò???ó?à???é???????????????????????????ú??,???±NOR?????ü????????????NAND?ò???????????????????í??????·?°???

????NOR??????????????????(XIP, eXecute In Place),???ù???????ò?????±????flash??????????,??±???°??ú??????????RAM????

NOR???????§??????,??1??4MB?????????±????????????±??§??,?????????????????????????ó?ó?°?ì???ü????????

????NAND?á?????á????????????????,??????????????????,?????????????????????????ì??????NAND???§??????flash?????í???è??????????????????



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????flash??????·??×?§?????÷,???????????é???????÷?????é????????????±à????????flash?÷??????????×÷?????????ò??????????????????,?ù???ó?à???é????,????????????×÷???°±???????????????NAND?÷????????????×÷????·??ò????,??NOR?ò???ó???????????°????????±ê?é???ù????????????0??

????????????NOR?÷???±????64??128KB???é??????,????????????/??????×÷???±????5s,?????à·?,????NAND?÷??????8??32KB???é??????,?????à??????×÷×??à???è??4ms??

?????????????±?é???????????????????ó??NOR??NADN?????????????à,????±í?÷,???????¨?????×??????×÷(???????ü?????????±?ü?à????????×÷±??????ù??NOR?????????????????ù,?±????????????·?°??±,?è????±????¨?????????÷???ò????

?????? NOR????????±?NAND???ì??????

?????? NAND??????????±?NOR?ì???à??

?????? NAND??4ms??????????±?NOR??5s?ì??

?????? ?ó?à????????×÷?è??????????????×÷??

?????? NAND???????????ü??,?à???????????·?ü????



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????NOR flash????SRAM????,??×????????·???????°?·,?????????×????????????????????×?????

????NAND?÷????????????I/O??????????????????,?÷???ú?·?ò?§????·?·¨?????÷???à????8???????????????????????·????????????

????NAND????????×÷????512×??????é,???????????????????í???à??×÷,??×?????,?ù??NAND???????÷?????????ú?????ò?????é?è±???



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????NAND flash????????????????NOR?÷??????°?,?????ú?ú?????ü???ò??,NAND?á???????????¨?????????????á???ü????????,?????à????????????????

????NOR flash????????????1??16MB???????????ó??·?,??NAND flash????????8??128MB???ú?·?±??,???????÷NOR?÷?????????ú???????é????,NAND??????????????,NAND??CompactFlash??Secure Digital??PC Cards??MMC?????¨???????ù??·???×??ó??



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????????flahs?é???±?????è???????????????????????????????è??????MTBF??????????,Flash??·?????????????·?°????????????ü(??????)?????????????é???í????·?????±???NOR??NAND??????????

???????ü(??????)

??????NAND???????????é??×??ó????????????°??ò??,??NOR???????????????ò????NAND?????÷????????10±?1???é????????????,??????NAND?é??????±?NOR?÷????8±?,????NAND?????÷?é?????¨???±????????????????????????

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?????ù??flash?÷???????????????ó???§???????????é????(??????,NAND·??ú????????±?NOR?à),????±??????á·??ú·?×??ò±?±¨??·?×?????

??????????±????????????÷??,????????·??ú?????????ü??????,?????????????????????????????ú??????????±¨????????,?à????????????????????

?????±??,????????????????±???,??±????????í?ó????/?í?ó?ü??(EDC/ECC)??·¨????·?×????????ü?à????NAND????,NAND?????????¨?é????NAND???????±?ò,???±????EDC/ECC??·¨??

??????????????????NAND?????à?????????±?????????ü?????±??,??????±????????è±?????????×÷???????????????ò?????????????±,±???????EDC/ECC???????·±?????????

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????NAND?÷?????????é?????ú·??????????°???????????????é??????,??·??????·??????,?ú??????,?ù±?????????

????NAND?÷???è?????é?????????????¨?è??·??????é,???????é±ê???????????????????????÷????,?????¨????????·?·¨???????????????í,????????????????



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????????·????±?????????ù??NOR??????,???????????????÷???ù????,?????????????±???????ú????

?????????è??I/O????,NAND?????????à???÷??NAND?÷????????·?·¨?ò?§?????ì??

??????????NAND?÷???±,±????????????????ò,??????????????????×÷???òNAND?÷???????????è???à?±??????,?ò???è???????????ò??

?é????,????????×???NAND?÷????×?????????±????????é????????



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?????±?????í???§?????±?ò,??????±??ù±?????/??/????×÷??????????????????·????????????í??·¨???í??,°ü?¨??????????

??????NOR?÷?????????ú?????è?????????í???§??,??NAND?÷???????????ù??×÷?±,?¨???è?????????ò,?????????????????????ò(MTD),NAND??NOR?÷????????????????????×÷?±???è??MTD??

????????NOR?÷???±?ù?è????MTD???à????????,?í?à?§?????á??????NOR?÷?????ü?????í??,??????°ü?¨M-System??TrueFFS????,??????±?Wind River System??Microsoft??QNX Software System??Symbian??Intel???§???ù??????

????????????????DiskOnChip?ú?·????·?????NAND?????????í,°ü?¨???í?????é???í????????????





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