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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)
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
Relative Speed/Prices Note : All prices are for 256 KB, 28 pin DIP, Parallel interface
Sources http://www.gamespy.com/articles/july03/25smartest/index9.shtml http://www.logistica.com.au/product.cfm/ProductID/DCE935CB-6C0E-48F2- 8E76-34DE339534E2 http://www.st.com/stonline/products/families/memories/nvram/nv_zp_wi.htm http://www.sbs.com/products/467 http://www.umem.com/MM-5415CN.html http://computer.howstuffworks.com/ram4.htm http://www.hyperdictionary.com/dictionary/non-volatile+storage http://hardwarecentral.dealtime.com/xDN-Musical_Instruments-EEPROM~CR- 010~DW-0 http://store.yahoo.com/safemart/noname8.html http://computer.howstuffworks.com/flash-memory.htm http://www.digikey.com http://www.tigerdirect.com
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