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Volt-only Flash Memory Technology
Technology Background
July 2003 following document refers Spansion memory products that offered both Advanced Micro Devices Fujitsu. Although document marked with name company that originally developed specification, these products will offered customers both Fujitsu.
There change this document result offering device Spansion product. changes that have been made result normal documentation improvements noted document revision summary, where supported. Future routine revisions will occur when appropriate, changes will noted revision summary.
Continuity Ordering Part Numbers
Fujitsu continue support existing part numbers beginning with "Am" "MBM". order these products, please only Ordering Part Numbers listed this document.
More Information
Please contact your local Fujitsu sales office additional information about Spansion memory solutions.
Publication Number 20602 Revision
Amendment Issue Date June 1998
TECHNOLOGY BACKGROUND
Volt-only Flash Memory Technology
Volt-only Technology Background
Introduction
AMD's Am29LVxxx volt-only Flash memory technology shares architectural features AMD's industry-standard, volt-only Am29Fxxx Flash memory technology. volt-only family offers single power-supply operation, sector architecture, Embedded Algorithms, high performance. become architecture choice system designers using single-power-supply Flash memory. AMD's Am29LVxxx volt-only family destined become Flash architecture choice designers battery-powered applications, offers following: volt-only, single-power-supply operation extended operating range power consumption High performance Industry standard architecture
addition, AMD's 0.35 0.32 process technologies offer minimum program/erase cycle endurance million cycles.
Single-Power-Supply Operation
volt-only design based same process technology many circuit design techniques AMD's volt-only Flash memory devices. devices fabricated using double metal layers, dual-layer polysilicon, triple-well CMOS process. AMD's process provides low-power, high-performance CMOS devices using established cell Flash architecture. initially manufactured volt-only family process, introduced Mbit devices 0.35 process. Many volt-only devices will migrate 0.32 process technology 1998. Volt-Only Design Techniques AMD's volt-only devices achieve single-power-supply operation using memory array constructed with core cells identical those AMD's volt-only devices. difference that volt-only peripheral circuitry surrounding memory core specifically designed interface with 2.7-3.6 volt levels only. Am29LVxxx family circuitry contains charge pumps that enable 2.7-3.6 volt external voltage provide volt-only performance read, program, erase operations. charge pumps volt-only design raise external power supply voltage levels required internal volt operation. This approach silicon efficient, volt-only
Volt-only Technology Background
charge pump design results negligible size increase over corresponding density, using same design rules, volt-only family. erase operation accomplished through AMD's patented Negative Gate Erase technology (NGE), which incorporates Fowler-Nordheim tunneling (see Figure programming operation accomplished with electron injection techniques (see Figure
word line tri-state
-8.5
line
Figure Volt-only Negative Gate Erase Voltage Setup
Notes:
Gate terminal pumped -8.5 volts less than current. (peak) erase current provided source terminal system's supply. drain, Gate, Source
word line
line
Figure Volt-only Programming Voltage Setup
Notes:
Gate terminal pumped volts less than current. Drain terminal pumped volts from supply drain, Gate, Source
Volt-only Technology Background
AMD's volt-only Flash devices read, program, erase volts, using single-power-supply pin, whereas so-called volt" mixed-voltage, Flash devices read volts, require either 12.0 program erase. Generating additional voltage involves using another power supply DC/DC converter. With AMD's singlepower-supply Flash devices, battery-powered applications require only single power supply accomplish in-system reprogrammability. Eliminating need additional power supply converter conserves power provides system-level cost savings. Optimized Battery-Powered Applications AMD's volt-only design optimized battery-powered systems. provide performance equivalent volt devices lower power consumption, volt-only devices designed interface with 2.7-3.6 volt levels only. Although some systems designers desire volt-only devices that interface with volt levels, providing this capability requires additional circuitry, which adds cost extracts performance penalty. Some systems have both volt volt components that share same data bus. System designers still AMD's volt-only devices this type design, voltage translators must used buffer devices from electrical over-stresses associated with volt devices sharing same data with volt devices.
2.7-3.6 Volt Extended Operating Range
operating range normally associated with volt" Flash devices AMD's volt-only family Flash devices have operating range which ideal battery-powered systems. This extended range allows portable systems operate longer between battery replacement recharging cycles. AMD's devices also operate over extended temperature range, which important many battery-powered portable applications.
Power Consumption
AMD's volt-only devices operate with very power consumption, while still providing performance equal AMD's volt-only Flash devices. AMD's volt-only devices provide power savings both active well inactive states. AMD's volt-only device active modes (read, program, erase operations), reduction power consumption versus volt device totals approximately percent.
Volt-only Technology Background
reduced accounts percent, design techniques that result lower current consumption provide remaining percent. addition, AMD's volt-only family provides inactive modes-a standby mode, Automatic Sleep Mode-that provide further power savings. Table lists power consumption figures these modes.
Table Volt-Only Volt-only Device Power Consumption Mode Typical Power Consumption(1) Volt-only Device Read Program Erase Standby Automatic Sleep Mode Volt-only Device Maximum Power Consumption(1) Volt-only Device 108/126 Volt-only Device 165/193
Typical power values product typical current multiplied volts (for volt-only device) volts (for volt-only device). Maximum power values product maximum current multiplied volts (for volt-only device) volts (for volt-only device). Byte/Word Mode.
design technique called Address Transition Detection (ATD), described under High Performance, provides power savings during read operations. proprietary, intelligent programming algorithm provides power savings during program operations. This algorithm analyzes programming task then provides optimal programming pulse (and thus minimum power) required complete byte word programming operation without sacrificing programming performance. volt-only family optimizes power savings inactive state through standby Automatic Sleep Modes. standby mode user controlled holding high) typically consumes only power when device deselected. During Automatic Sleep Mode, device typically consumes only after addresses have been stable minimum tACC regardless logical state CE#, pins. device resumes active operation from either standby Automatic Sleep Modes using standard timing tACC. There latency penalty associated with either standby mode Automatic Sleep Mode; only standard tACC applies.
Volt-only Technology Background
High Performance
AMD's volt-only devices offer choice fast access times extended voltage range volts faster access times regulated voltage range volts. example, AMD's newly introduced Am29LV001B speed option regulated voltage range speed option extended voltage range. speed voltage operation volt-only family makes them ideal solutions highperformance, battery-powered applications. following sequence events within device illustrates achieves high performance during read operation: voltage transition that appears address pins initiates Address Transition Detection (ATD) circuitry retrieve next byte word data. initiates charge pump circuitry boost voltage word lines from volts volts device decodes address loads data from array into data latches. word lines remain boosted volts internally only until requested data latched. After data latched, reduces voltage word lines volts, data remains available from data latches until next read request from different address. address lines remain stable tACC device enters Automatic Sleep Mode, reducing voltage word lines volts. Boosting word lines only needed provides read access times equivalent AMD's volt-only Flash memories similar density organization. Automatic Sleep Mode provides additional power savings without sacrificing performance. program erase modes, volt-only design uses efficient power supply charge pump design, which pumps gate voltage with current, reduce program erase times. volt-only devices offer this performance without compromise voltage levels volts.
Volt-only Technology Background
Industry Standard Architecture
AMD's volt-only family products based same process technology industry standard architecture AMD's volt-only Flash devices. AMD's process provides low-power, high-performance CMOS devices using cell Flash architecture. Am29LVxxx family offers following features: JEDEC single-power-supply standard pinout software commands. memory array that segmented into smaller sectors erase operation. This feature allows modular code development, storage boot code, parameters, main code different sectors, ability write protect sectors device. AMD's Embedded Program Embedded Erase algorithms that simplify Flash operation automating programming erase operations chip. This eliminates need dedicated control device, thus improves system-level performance. embedded algorithms automatically detect correct overerase, eliminate program/erase software implementation errors associated with first-generation manual algorithm Flash devices. guaranteed minimum endurance million program/erase cycles 0.35 0.32 process technologies. This equates higher reliability systems that rewrite data even once Flash device.
Summary
AMD's volt-only design offers advantages performance volt-only, industry standard architecture, while providing volt operation optimized battery-powered applications. Features industry standard architecture include single-power-supply operation, sector architecture, Embedded Algorithms. addition, AMD's volt-only, Am29LVxxx family Flash memories provides extended operating range power consumption without sacrificing performance.
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