Non-Volatile Memory Jeremy Searle Feb. 4 th, 2004 Tech Topic Presentation.

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Presentation transcript:

Non-Volatile Memory Jeremy Searle Feb. 4 th, 2004 Tech Topic Presentation

Definition A storage device whose contents are preserved when the system power is turned off. Examples: Magnetic disks, magnetic tape, paper tape, punch cards, CD-ROM’s, EEPROM, SRAM with batteries,

Report Focus -Applicable to micro-controllers -Single chip (28 pin DIP) -Current technology -Three types: NV-SRAM, EEPROM, Flash EEPROM

Battery Backed SRAM (NVSRAM) What is it: Static RAM that has a battery connected to it in order to keep the SRAM contents when system power is off Uses: Constantly changing/updating data that must be recorded Common Uses: Control system data acquisition cards/Computer cards, HP calculator memory, older video game cartridges

Battery Backed RAM

EEPROM What is it: Read Only Memory that requires absolutely no power to save data. Similar to EPROM except it can be programmed electrically, without removal/UV exposure Uses: Storing small amounts of data which is NOT frequently changed Common Uses: voice recognition phone dialers, lighting controllers/mixers, newer video game cartridges (Electrically Erasable Programmable Read Only Memory)

EEPROM

Flash Memory What is it: A type of EEPROM that erases a block of data or the chip’s entire contents at one time, resulting in faster writing times Uses: Storing small amounts of data which is NOT frequently changed Common Uses: Memory sticks for digital cameras, portable USB drives, 68HC08 memory

Flash Memory

Relative Speed/Prices Note : All prices are for 256 KB, 28 pin DIP, Parallel interface

Sources 8E76-34DE339534E ~DW

Questions?