13-FlashMemory

13-FlashMemory - MEMORY MEMORY ECE 2534 Packet 13...

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EMORY MEMORY ECE 2534 Packet 13
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olid ate Memory: Fundamental Types Solid-state Memory: Fundamental Types ± RAM : Random-Access Memory ± ROM : Read-Only Memory ² Can read/write any memory word ² “Random”: access time is the same for all locations ² olatile ² Can read any memory word ² Access is also “random”: (read time is the same for all locations) ² onvolatile Volatile ² Can be used for storing variables ² Can also store instructions and constants, but these must be aded into memory after power- p Nonvolatile ² Cannot be used to store variables (!) ² Great for storing things that never change, esp. instructions and onstants loaded into memory after power up constants ² Code placed here is sometimes called “firmware” 2
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lose Relatives Close Relatives ± RAM : Random-Access Memory ± ROM : Read-Only Memory ² SRAM: Static RAM ² DRAM: Dynamic RAM ² . . . DR SDRAM: ² Can only be written once, in the factory ² Economically viable only for large quantities ² DDR SDRAM: Double Data Rate Synchronous Dynamic RAM ± PROM: Programmable ROM ² Can only be written once ² Can be written essentially anywhere , using special (but inexpensive) equipment ± Erasable ROM Volatile Nonvolatile ² EPROM: Erasable Programmable ROM (typically erased using UV light) ² EEPROM: Electrically Erasable Programmable ROM (typically erased and re-written without removing from irc it board) 3 circuit board) ² FLASH MEMORY
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RAM vs DRAM SRAM vs. DRAM ±
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13-FlashMemory - MEMORY MEMORY ECE 2534 Packet 13...

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