MPAI-NE404

MPAI-NE404

MPAI-NE404

MPAI-NE404

MPAI-NE404

正如上面提到的，关于我们设备上使用的 flash 技术，您需要知道很重要的一点是，您只能有限次地擦写存储设备。往 flash 存储上写入大量的数据，并不是一个好的主意。上面的表格所示，根据所使用的 flash 类型不同，

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直到数据可能出现损坏或者丢失前，您可以进行 10K 到 100K 次写操作。“擦写周期” 这一个令人烦恼的事情。Flash 存储的一个限制是，在被擦除之前是无法进行写操作的。而且，不能通过位擦差来完成，而是需要更大的单位，称为块。 糟糕的情况是，如果你只想改变一个字节，但是可能需要擦除整个块。一个块 大可以使 512KB。这种比你想象的要大的多的擦/写比现象称为写放大。并且可能还有 flash 文件系统所需的额外写操作。如果你想要评估你嵌入式设备上的存储的寿命，你应该把这个也考虑进来。

提高 flash 寿命

下面的内容向你介绍如何提高 NAND 或者 eMMC 的寿命。不要担心，这些工作都已经由 Toradex 完成，你不需采取任何工作。

防止磨损：磨损平衡

我们假设你已经了解 flash 只能被有限次地擦写，并且你只是偶尔小批量地更新数据。如果这些数据总是写在同一个 flash 单元，那么你只能在 MLC flash 上写 15K 次。如果永远不使用其他 flash 单元，你的数据将会丢失，一直在写的存储单元磨损后，flash 也就随着报废。智能的 flash 驱动会采用磨损平衡。这个技术确保所有的 flash 单元被平均磨损，而不是总是使用同一个单元。

APPLIED MATERIALSAPERTU?RE, SILICON CARBIDE, EHO AMI 

POLY FLOW ENGINEERING MOTOR, GEAR, 3RPM, 1/50TH HP

AMETEK GAS INDICATING PRESSURE SWITCH IPS-200-LA

LAM 9600 Ceramic Consumables Rings

Applied Materials 0010-99166 MOVING CLIP ASSEMBLY

SCANDIALOGIC CONTROLLER, SCM750-1

SEMITOOL DIGITAL FLOWMETER FT0-4A1YS-LHA-1

Pacific Scientific Motor STF3624-5604-61?-56C

Hayward Actuator for drain Valves KC-PHS15

Applied Ceramics RING XL CLAMP SILICON, 91-01394A

Applied Ceramics VALVE SLIT INSERT QUARTZ 91-01680A500

FLOWMETER 5-20 GPM 3/4 FLR ENDS 72056-85 

MILLIPORE .05 MICRON QUICK CHANGE FILTER, QCDZATXTH

Applied Materials 0020-82813 ELECTRODE, APERTURE, EHO- 

Ultrasonic Ranging Proximity Sensor RPS 300

MILLIPORE WAFERGARD T-LINE GAS FILTER WGGB 12S02

PARKER REGULATOR BACK PRESSURE, BR-3-1168-2

AUTOMOTION MOTOR CONTROLLER ALC1500 MAGNUM

CUTLER-HAMMER INTRIAL CIRCUIT BREAKER, EHD3020L

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Integrated Power Designs Power Supply SRW-115 4005

DATA INSTRUMENTS DIGITAL FLOWMETER, 410500-9022/AFL?AS


TOKYO ELECTRON SENSOR, ATM PS-10V 760 TORR, TEF

Sensor Technics Pressure Transducer 839-607828/SQ00?503

AP Tech Regulator AP1910SM/889-60?6950

MKS Manometer ABS 124AA-00100BB

Proportion Air PA 70905-27

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Lambda 500W Power Supply FE050048-RA

Integrated Power Designs Power Supply REL-110-4006

Applied Materials 0020-82821

Applied Materials 0020-83583 SHIELD GUIDE TUBE 9500XR 

SENSARRAY 6" TEST WAFER PART 1501B-6-0001 

MAEK LOADER, 10-349222-01

Futurestar Rotameter-Flowm?eter

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Control Concepts AC Noise Filter KC-IE-110

Applied Materials, ESC ASSEMBLY 125 MM, 0090-00091

Setra Pressure Transducer 2251100PGD41106

APPLIED MATERIALS SHADOW RING 0200-00156

NT INTERNATIONAL FLOW THRU PRESSURE TRANSDUCER

ASTI Flow Sensor 20 L/min, 3/4 FLR

Entegris 4/2" PFA Hand Valve 201-42-01

APPLIED MATERIALS SCREEN SLIDE ENTRY 9500XR - AMI

DNS ELECTRONICS ARM, 1H (2) - 80A- SCRUBBER

Intelligent Motion Systems (IMS) Microstepper and Index

Pentagon Tech Pedestal, Quartz, Pinless, Q15-0217

BIMBA MOTOR ASSEMBLY WITH HIGH TORQUE PLATING 0G70-S YG

A, I/O Board, w/ standoffs AIM104-RELAY8/I?N8

Air Products AP2 LCD Display 809-607057

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Flextech, Cab Controller, 2103-0391

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APPLIED MATERIALS DC POWER SUPPLY, 01-81913-00

Saint Gobain Door Seal 480150091

AP2 Solenoid Bank 16V VV3Q11-ULB97019?3-16

Air Products Solenoid Digi. output board 809-607699

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SMC APX16-Point Solenoid Bank 10V VV3Q11-ULB97019?4-10

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MRC PCB, STEPCONTI/F, 884-55-000

Cable, Sensor, PT-100 85939

Saint Gobain Door Seal 480150089

Nikon PCB 4S018-210A

APPLIED MATERIALS PEDESTAL ASSEMBLY, 0010-09574

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Yaskawa Servo Motor, SG25TA-PE01A1

ASTI Flow Sensor 10 L/min, 1/2 FLR

Blue White Flowmeter, 0.2-2.0 gpm, Model F-500

Futurestar Odyssey Flowmeter 1 pm, 1/4 FLR

Futurestar Odyssey Flowmeter 1.75-5 lpm, 3/8 FLR

Futurestar Odyssey Flowmeter 5-25, 1/4 FLR

Yaskawa AC Servo Motor, Bhless with Brake

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EMOTEQ CORP MOTOR ASSY PADDLE ACTUATING HS01001-A02-HGE

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APPLIED CERAMICS, CERAMIC PLATE, 200MM, 716-028721-281

Cherry Electric exht vane switch 1491-3144

ASYS CONTROLLER, 10052885

FURON 1/2", 2 way Valve, DIBPOL8PC

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INSERT, INNER, MULTI-CHARGER/B?EAM TRAP MULTI-CHARGED 

HATHAWAY/EMOTEQ MOTOR LIFT/TILT, BH02301A F04HBE 

Micronix, I/0 board, PV-1648 Rev.3

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WESCO DISCONNECT SWITCH, NZM7-200-NA

Yaskawa AC Servo Motor, SGMP-01U314M

BIORAD 5" Cassette, QS600, 013-5363-1

APPLIED MATERIALS FINGER LONG HOLLOW GRIPPER -AMI (SLO

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APPLIED MATERIALS PCB, SIGNAL CONDITION, ASSEMBLY

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