EPROM vs EEPROM
EEPROM thiab EPROM yog ob hom kev nco cia tsim nyob rau xyoo 1970s. Cov no yog non-volatile erasable thiab reprogrammable nco hom thiab feem ntau yog siv nyob rau hauv hardware programming.
EPROM yog dab tsi?
EPROM sawv cev rau Erasable Programmable Read Only Memory, kuj yog ib pawg ntawm cov khoom siv nco tsis hloov pauv uas tuaj yeem raug programmed thiab tshem tawm. EPROM tau tsim los ntawm Dov Frohman ntawm Intel hauv 1971 raws li kev tshawb nrhiav rau hauv kev sib txuas ua ke tsis raug qhov twg qhov rooj sib txuas ntawm cov transistors tau tawg.
Ib qho EPROM nco cell yog cov khoom loj ntawm cov rooj vag ntab Field Effect Transistors. Cov ntaub ntawv (txhua me ntsis) yog sau rau ntawm tus kheej Field Effect Transistors hauv lub nti siv tus programmer uas tsim cov dej ntws tawm sab hauv. Raws li qhov chaw nyob ntawm tes ib qho FET cov ntaub ntawv khaws cia thiab qhov hluav taws xob ntau dua li qhov qub digital circuit kev khiav hauj lwm voltages yog siv rau hauv kev ua haujlwm no. Thaum qhov hluav taws xob raug tshem tawm, cov hluav taws xob tau daig hauv cov electrodes. Vim nws cov conductivity tsawg heev silicon dioxide (SiO2) rwb thaiv tsev txheej ntawm lub rooj vag khaws cov nqi mus ntev; li no khaws cia nco tau kaum mus nees nkaum xyoo.
Ib EPROM nti yog tshem tawm los ntawm kev raug UV muaj zog xws li Mercury vapor teeb. Erasure tuaj yeem ua tiav siv lub teeb UV nrog lub wavelength luv dua 300nm thiab nthuav tawm rau 20 -30 feeb ntawm qhov ze (<3cm). Rau qhov no, EPROM pob yog tsim nrog lub qhov rais fused quartz uas nthuav tawm cov silicon nti rau lub teeb. Yog li ntawd, ib qho EPROM tau yooj yim txheeb xyuas los ntawm cov yam ntxwv fused quartz qhov rais. Erasure tuaj yeem ua tiav siv X-rays ib yam nkaus.
EPROMs yog siv los ua cov khw muag khoom nco zoo li qub hauv cov voj voog loj. Lawv tau dav siv los ua BIOS chips hauv computer motherboards. Tab sis lawv tau hloov pauv los ntawm cov thev naus laus zis tshiab xws li EEPROM, uas pheej yig dua, me dua thiab sai dua.
EEPROM yog dab tsi?
EEPROM stands rau Electronically Erasable Programmable Read Only Memory, uas yog hom kev nco siv ntau tshaj plaws kom txog thaum Flash nco tau muaj. EEPROM tau tsim los ntawm George Perlogos ntawm Intel hauv 1978 raws li EPROM Technology yav dhau los. Intel 2816 yog thawj lub lag luam tawm EEPROM nti.
EEPROMs kuj yog ib qho loj ntawm cov rooj vag ntab MOSFETs zoo li EPROMs, tab sis tsis zoo li EPROMs, EEPROMs muaj txheej nyias nyias ntawm cov rooj vag. Yog li ntawd, cov nqi hauv cov rooj vag tuaj yeem hloov tau hluav taws xob. EEPROMs yog ob qho tib si hluav taws xob programmable thiab erasable. Lawv tuaj yeem raug programmed, tshem tawm thiab tom qab ntawd reprogrammed yam tsis tau tshem tawm ntawm Circuit Court. Tab sis lub Circuit Court yuav tsum tau tsim los ua kom haum rau kev sib kis ntawm cov phiaj xwm tshwj xeeb.
Raws li cov ntaub ntawv sib txuas lus hom EEPROMs tau muab faib ua Serial thiab Parallel interface hom. Feem ntau, parallel bus chips muaj 8-ntsis dav cov ntaub ntawv tsheb npav uas tso cai rau kev siv ntau dua. Nyob rau hauv sib piv, serial interface hom muaj tsawg tus pins; Yog li ntawd, kev khiav hauj lwm yuav tsum tau ua nyob rau hauv ib tug serial yam. Yog li ntawd, parallel EEPROM sai dua thiab siv feem ntau piv rau serial interface hom EEPROMs.
EEPROM chips tau siv dav hauv cov khoos phis tawj thiab lwm yam khoom siv hluav taws xob rau khaws cov ntaub ntawv me me uas yuav tsum tau khaws cia thaum lub zog raug tshem tawm thiab yuav tsum tau muab rov qab thaum rov pib dua. Cov ntaub ntawv xws li cov ntsiab lus teeb tsa thiab cov rooj ntsuas ntsuas tau muab khaws cia hauv EEPROMs. EEPROMs kuj tau siv los ua BIOS chips. Tam sim no ib qho txawv ntawm EEPROM, FLASH ROM tau dhau los ua lag luam, vim nws lub peev xwm, tus nqi qis thiab kev ua siab ntev.
Qhov txawv ntawm EEPROM thiab EPROM yog dab tsi?
• EPROMs yuav tsum tau muab tshem tawm nrog qhov raug UV teeb thiab EEPROM tuaj yeem tshem tawm hluav taws xob.
• EPROMs muaj lub qhov rais Quartz hauv pob kom nthuav tawm cov nti rau UV teeb thiab EEPROMs tau ntim tag nrho hauv cov ntaub ntawv yas opaque.
• EPROM yog lub tshuab qub.
