8-Nathan Fu Flash Memory Presentation

8-Nathan Fu Flash Memory Presentation - Flash Memory ECE...

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Flash Memory ECE 3080 Professor Doolittle Nathan Fu
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Memory: A Brief Overview Two types: Volatile ± R andom A ccess M emory (RAM) : faster, data lost when power switched off Nonvolatile ± R ead- O nly M emory (ROM) : solid-state, retain information even when power switched off
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Memory: A Brief Overview Read-Only Memory categories: ROM : permanent data written in memory array PROM : user programmable data written to memory ( P rogrammable ROM ) EPROM : electrically programmed, erased via UV exposure ( E rasable PROM ) EEPROM : electrically erasable and programmable in-system ( E lectrically EPROM )
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Flash Memory Introduction A specific type of EEPROM with the ability to erase whole blocks (as opposed to bytes) in one erase cycle Used when larger amounts of data need to be stored without power Some things that use flash memory: ± Computer BIOS ± Memory cards ± Solid-state disks (SSDs)
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Common solutions to store charge: In “traps” in the insulator or at the interface between two dielectrics (usually silicon oxide/nitride). These devices are called MNOS ( M etal- N itride- O xide- S ilicon) cells. In a conductive material layer surrounded by an insulator between the gate and the channel. These devices are called “floating gate” cells.
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8-Nathan Fu Flash Memory Presentation - Flash Memory ECE...

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