PowerManagementofFlashMemoryforPortableDevices.pptVIP

Power Management of Flash Memory for Portable Devices Outline Introduction to Flash Memory Why power optimization? Dynamic Voltage Scaling Simulation Conclusion Flash Memory Non-volatile data storage devices Storage of trapped electrons in cells Cells have different logical functions: NOR or NAND NOR flash memory:- Faster read time longer erase and write times NAND flash memory:- Longer read time Faster erase and write times Usage of Flash Memory Computers BIOS chip Digital cameras Mp3 players Memory Stick PCMCIA Type I and Type II memory cards PDA Advantages of Flash Memory Maintain stored information without power source High storage capacity and compatibility No physical disk to spun as in hard disks High processing speed:- Virtually the speed is same as light’s speed. Limiting factor is USB 2.0 Compact size:- 2mm to 3mm in width Why Power Optimization ? Demand for portable electronics devices have increased Power consumption is major obstacle in any mobile portable devices. Main task to maintain low power consumption Low power increases the performance and makes the devices durable Limitations on Power Optimization Low power consumption Supply voltage Clock frequency Performance time Circuit delay Low cost System Block Diagram of a Portable Device (mp3 player) Power Optimization Algorithms Dynamic Voltage Scaling Static Voltage Scaling Voltage Clock Scaling Dynamic Voltage Scaling Algorithm Allows devices to change voltage and speed Uses different voltage level for program, write and erase Uses high voltage when the work load is high Uses low voltage when the work load is low Advantages of Dynamic Voltage Scaling Algorithm Advanced electronic chips allows to have different voltage levels in devices Intelligence power management allows to lengthen the operational time by operating the devices at low power level, whenever possible Save the battery power Our Contributions Literature search on various power management algorithms Selected o