NAND Flash vs NOR Flash
Flash nco yog ib qho ntawm feem ntau siv tsis muaj hluav taws xob semiconductor nco hom hauv cov khoos phis tawj niaj hnub thiab hauv ntau yam khoom siv txawb thiab cov neeg siv khoom. NAND flash thiab NOR flash yog cov ntaub ntawv tseem ceeb ntawm flash technology. Flash nco tshuab yog qhov txuas ntxiv los ntawm EEPROM thiab NAND / NOR sawv rau lub rooj vag architecture siv los tsim cov khoom siv nco.
NAND Flash yog dab tsi?
Cov chips flash tau muab faib ua ntu ntu hu ua blocks, thiab cov ntaub ntawv khaws cia rau hauv cov kev tshem tawm no. Hauv NAND flash architecture, cov blocks no txuas txuas txuas ntxiv. Qhov ntau thiab tsawg ntawm cov blocks tshem tawm yog 8kB txog 32kB, uas yog me dua, tso cai rau kev nyeem ntawv, sau ntawv, thiab tshem tawm nrawm dua. Tsis tas li ntawd, NAND cov cuab yeej txuas nrog siv qhov nyuaj sib txuas sib txuas thiab qhov sib cuam tshuam tuaj yeem sib txawv ntawm cov chaw tsim khoom mus rau cov chaw tsim khoom. Feem ntau, yim tus pins yog siv los xa, tswj, thiab khaws cov ntaub ntawv cov ntaub ntawv. Nyob rau tib lub sijhawm, tag nrho yim tus pins tau ua haujlwm, feem ntau hloov cov ntaub ntawv hauv 512kB tawg.
Structurally NAND architecture yog tsim los rau optimized high density lithography raws li kev lag luam tawm ntawm kev nkag mus rau qhov muaj peev xwm mus rau qhov thaiv me me. Qhov no ua rau NAND flash nco pheej yig dua nyob rau hauv cov nqe lus ntawm tus nqi ib ntim. Hauv txoj kev xav, qhov ceev ntawm NAND flash yog ob npaug ntawm NOR flash.
NAND flash yog tsim rau cov ntaub ntawv khaws cia. PC phaib, compact flash, SD phaib, thiab MP3 players siv NAND flash drives ua lub cim xeeb.
NOR Flash yog dab tsi?
NOR flash nco yog qhov qub ntawm ob hom flash nco. Hauv kev teeb tsa hauv Circuit Court ntawm NOR flash, tus kheej lub cim xeeb txuas nrog tib lub sijhawm; yog li ntawd, cov ntaub ntawv tuaj yeem nkag tau ntawm qhov kev txiav txim random. Vim qhov no random nkag muaj peev xwm NOR muaj luv luv nyeem lub sij hawm thaum retrieving cov ntaub ntawv rau kev tua. NOR hom flash yog txhim khu kev qha thiab ua rau me ntsis flipping teeb meem.
Qhov ceev ntawm kev tshem tawm blocks hauv NOR flash yog qis dua NAND architecture. Yog li ntawd, tus nqi ib ntim yog siab dua. Nws kuj tseem siv lub zog siab dua ntawm kev tos txais txawm hais tias, thaum lub sijhawm ua haujlwm, nws siv lub zog qis dua piv rau NAND flash. Tsis tas li ntawd, kev sau nrawm thiab tshem tawm ceev yog tsawg. Tab sis txoj cai ua tiav nrog NOR flash yog ntau dua vim yog kev tsim hauv random nkag architecture.
Lub NOR flash yog siv rau cov lej khaws cia hauv cov khoom siv, xws li cov lej khaws cia ntawm cov koob yees duab digital thiab lwm cov ntawv thov kos.
Qhov txawv ntawm NAND Flash thiab NOR Flash yog dab tsi?
• NOR flash yog laus dua NAND flash architecture.
• NAND flash muaj qhov ceev dua ntawm kev tshem tawm ntau dua li NOR flash.
• Hauv NAND flash architecture, tshem tawm cov blocks txuas txuas txuas ntxiv thaum, hauv NOR flash, cov uas txuas nrog rau tib lub sijhawm.
• Kev nkag mus rau hom NAND yog qhov sib txuas thaum NOR muaj qhov nkag tsis tau.
• Yog li ntawd, kev nyeem nrawm ntawm NOR yog nrawm dua NAND.
• NOR flash muaj qhov nrawm nrawm heev piv rau NAND flash, thiab kev sau nrawm ntawm NOR kuj qeeb.
• NAND tuaj yeem mus txog 100, 000-1, 000, 000 erase cycles thaum NOR tuaj yeem txhawb nqa tsuas yog 10, 000-100, 000 cycles.
• NOR flash yog txhim khu kev qha ntau dua thiab muaj feem pua ntawm me ntsis flipping, thaum NAND flashes xav tau ib qho ntxiv me ntsis rau kev tswj qhov yuam kev.
• NAND flashes haum rau cov ntaub ntawv khaws cia thaum NOR flashes tsim nyog rau kev khaws cia.
• NAND flash nco yog pheej yig dua piv rau NOR flash nco txog tus nqi ib ntim.
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