Lo lus "flash nco" yog tam sim no nyob rau hauv txhua leej txhua tus daim di ncauj. Lub sij hawm "flash drive" txawm thawj-kawm qib nyob rau hauv qhov kev sib tham yog feem ntau siv. Qhov no technology nrog zoo kawg ceev tau tej chaw. Ntxiv mus, ntau ntsuam kwv yees hais tias nyob rau hauv lub nyob ze yav tom ntej flash nco yuav hloov cia li raws li nyob rau hauv magnetic disks. Ua li cas tseem yog tsuas mus soj ntsuam cov kev loj hlob kev kawm thiab cov kev pab cuam. Kuj ceeb tias, ntau yam, hais txog no cov khoom tshiab, yuav luag unaware hais tias xws li ib tug flash nco. Nyob rau hauv ib tes, tus neeg siv yuav tsum tau mus rau lub ntaus ntawv ua hauj lwm, thiab yuav ua li cas nws ua nws zog - me teeb meem. Txawm li cas los, muaj tsawg kawg yog ib tug to taub yooj yim tsim nyog rau txhua tus kawm ntawv tus neeg.
Yuav ua li cas yog flash nco?
Raws li koj paub, computers muaj ob peb hom cia li: nco modules, nyuaj drives thiab kho qhov muag drives. Lub ob - nws yog electromechanical daws teeb meem. Tab sis RAM - tag nrho hluav taws xob ntaus ntawv. Yog ib tug sau ntawm transistors rau ib tug nti tau koom ua ke ib tug tshwj xeeb nti. Nws peculiarity lus dag nyob rau hauv lub fact tias cov ntaub ntawv uas yog cia kom ntev li ntev raws li hauv lub hauv paus electrode ntawm txhua tswj tseem ceeb yog energized. Tam sim no peb tom qab muab ib tug los ze zog saib. Flash nco yog devoid ntawm no shortcoming. them cia teeb meem tsis muaj ib tug sab nraud voltage solved siv floating rooj vag transistors. Nyob rau hauv lub qhaj ntawv ntawm sab nraud cawv xwb nyob rau hauv xws li ib tug ntaus ntawv yuav tsum khaws cia sufficiently lub sij hawm ntev (yam tsawg kawg 10 xyoo). Yuav kom piav qhia txog lub hauv paus ntsiab lus ntawm lub lag luam, nws yog tsim nyog yuav tau nco qab cov qauv rau kev electronics.
Yuav ua li cas yog ib transistor?
Cov ntsiab tau ua thiaj li lug siv hais tias nws yog tsis tshua muaj, qhov uas lawv yuav tsis siv. Txawm banal lub teeb mus yog tej zaum teem tsav lub lag luam. Yuav ua li cas puas tau tus classic transistor txheej txheem? Nws yog raws li nyob rau hauv ob semiconductor khoom, ib tug ntawm cov uas muaj ib tug hluav taws xob conductivity (n), thiab lwm yam qhov (p). Yog xav tau ib tug yooj yim transistor, nws yog tsim nyog los muab cov ntaub ntawv, xws li npn thiab txhua thaiv plug electrode. Nyob rau ntawm ib huab electrode (emitter) voltage yog thov. Lawv muaj peev xwm yuav tswj tau los ntawm kev pauv qhov ntau ntawm lub peev xwm rau hauv nruab nrab tso zis (puag). Tshem tawm tshwm sim nyob rau hauv lub collector - peb huab sib cuag. Nws yog pom tseeb tias nrog lub disappearance ntawm lub hauv paus voltage yuav rov qab mus rau ib tug nruab nrab hauv lub xeev. Tab sis transistor ntaus nrog ib tug floating rooj vag lwm fleshek txawv me ntsis: rau pem hauv ntej ntawm lub semiconductor puag cov ntaub ntawv uas yog muab tso rau ib tug nyias txheej ntawm dielectric thiab cov floating rooj vag - ua ke lawv tsim ib tug thiaj li hu ua "lub hnab tshos". Thaum ua ntawv thov plus voltage rau lub hauv paus ntawm lub transistor yuav tsum tau qhib los ntawm xeem dhau ib tug tam sim no uas ua raws li ib tug logic zero. Tab sis, yog hais tias lub qhov rooj mus rau ib tug hluas xwb (electron), nws teb neutralizes cov nyhuv ntawm lub hauv paus tsev - tus ntaus ntawv yuav tsis kam kaw (cov zajlus kom chav tsev). By ntsuas lub voltage ntawm lub emitter thiab cov collector yuav txiav txim hauv lub xub ntiag (los yog tsis tuaj kawm ntawv) ntawm tus nqi rau cov floating rooj vag. Muab tus nqi rau ntawm lub rooj vag los ntawm kev siv lub qhov nyhuv (Fowler - Nordheim). Yuav kom tshem tawm cov yuav tsum tau ua lub siab xwb (9) rau ib tug tsis zoo voltage thiab ib tug zoo puag rau emitter. Tus nqi yuav tawm lub qhov rooj. Txij li thaum lub technology yog lossi ua nrog, nws tau raug npaj siab mus muab cov embodiment thiab ib tug pa transistor nrog cov floating rooj vag. Qhov no tso cai rau "lwv" them ib tug tsis tshua muaj voltage thiab tsim ib tug ntau compact ntaus ntawv (tsis muaj yuav tsum tau cais tawm). USB eeb nco siv txoj ntsiab cai no (Nand Qauv).
Yog li, los ntawm combining cov transistors nyob rau hauv lub blocks, nws yog tau los mus tsim ib tug nco nyob rau hauv uas lub kaw cov ntaub ntawv yog raws muab khaws cia tseg tsis muaj kev hloov rau decades. Tej zaum qhov tsuas drawback uas niaj hnub flash drives - cov sau mus tsis pub tshaj.