Flash memory
Flash memory is a non-volatile computer storage chip that can be electrically erased and reprogrammed. It was developed from EEPROM
(electrically erasable programmable read-only memory) and must be
erased in fairly large blocks before these can be rewritten with new
data. The high density NAND type must also be programmed and read in
(smaller) blocks, or pages, while the NOR type allows a single machine word (byte) to be written or read independently.
The NAND type is primarily used in memory cards, USB flash drives, solid-state drives, and similar products, for general storage and transfer of data. The NOR type, which allows true random access and therefore direct code execution, is used as a replacement for the older EPROM and as an alternative to certain kinds of ROM applications. However, NOR flash memory may emulate ROM primarily at the machine code level; many digital designs need ROM (or PLA) structures for other uses, often at significantly higher speeds than (economical) flash memory may achieve. NAND or NOR flash memory is also often used to store configuration data in numerous digital products, a task previously made possible by EEPROMs or battery-powered static RAM.
閃存是一種非易失性的計算機存儲芯片，可電擦除和重新編程。從EEPROM（電可擦除可編程只讀存儲器），它被開發之前，這些都可以用新的數據重寫，必須在相當大的塊擦除。還必須進行編程的高密度NAND型和閱讀中（小）塊，或網頁，而NOR型允許一台機器字（字節），以書面或獨立閱讀。
NAND型記憶卡，USB閃存驅動器，固態驅動器，與同類產品一般存儲和數據傳輸，主要用於。 NOR型，從而使真正的隨機存取，因此直接執行代碼，用於更換舊的EPROM和ROM的應用程序的某些種類的替代。然而，NOR快閃記憶體可能效仿，主要在機器代碼級的ROM;許多數字設計需要作其他用途ROM（或解放軍）的結構，往往比（經濟型）快閃記憶體，可達到顯著更高的速度。 NAND或NOR快閃記憶體也常常被用來配置數據存儲在眾多的數碼產品，以前的任務可能由EEPROM或電池供電的靜態RAM。
The NAND type is primarily used in memory cards, USB flash drives, solid-state drives, and similar products, for general storage and transfer of data. The NOR type, which allows true random access and therefore direct code execution, is used as a replacement for the older EPROM and as an alternative to certain kinds of ROM applications. However, NOR flash memory may emulate ROM primarily at the machine code level; many digital designs need ROM (or PLA) structures for other uses, often at significantly higher speeds than (economical) flash memory may achieve. NAND or NOR flash memory is also often used to store configuration data in numerous digital products, a task previously made possible by EEPROMs or battery-powered static RAM.
閃存是一種非易失性的計算機存儲芯片，可電擦除和重新編程。從EEPROM（電可擦除可編程只讀存儲器），它被開發之前，這些都可以用新的數據重寫，必須在相當大的塊擦除。還必須進行編程的高密度NAND型和閱讀中（小）塊，或網頁，而NOR型允許一台機器字（字節），以書面或獨立閱讀。
NAND型記憶卡，USB閃存驅動器，固態驅動器，與同類產品一般存儲和數據傳輸，主要用於。 NOR型，從而使真正的隨機存取，因此直接執行代碼，用於更換舊的EPROM和ROM的應用程序的某些種類的替代。然而，NOR快閃記憶體可能效仿，主要在機器代碼級的ROM;許多數字設計需要作其他用途ROM（或解放軍）的結構，往往比（經濟型）快閃記憶體，可達到顯著更高的速度。 NAND或NOR快閃記憶體也常常被用來配置數據存儲在眾多的數碼產品，以前的任務可能由EEPROM或電池供電的靜態RAM。
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