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NAND Flash

NAND flash memory types

NAND闪存设备用于存储数据和代码. 阅读下面的更多内容，以帮助您根据需要选择正确的NAND器件.

NAND闪存技术及应用

低密度NAND闪存是汽车等应用的理想选择, machine-to-machine, IPC and home networking. 高密度NAND闪存最常用于像ssd这样的数据密集型应用程序, tablets and USB drives.

人们一直在努力降低NAND设备的每GB成本, 因此，设备的生命周期往往更短，更频繁的工艺光刻收缩. NAND requires a controller, either internal or external, 以及用于纠错码(ECC)的专用固件, bad block management, and wear leveling.

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NAND flash devices. Raw NAND vs Fully Managed NAND

Raw NAND

Raw NAND提供最低的每比特成本，但需要一个外部主机控制器(不包含在封装中)来执行所有的管理功能(例如.g., ECC, FTL).

Single-level cell (SLC)

One bit per cell; high performance and write endurance; designed for high-end, high-density, 关键任务系统需要NAND高性能标准和可靠性，降低成本并不是主要驱动因素

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Serial NAND

低密度SLC器件，具有类似nor的串行接口，简化系统设计 

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Multilevel cell (MLC)

Two bits per cell; a good balanced of performance and write endurance for a wide range of cost-sensitive, high-density applications 

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Embedded MLC+ NAND

Uses special programming algorithms to extend write endurance; typically used in high-write workloads like time shifting (pausing live TV) 

Triple-level cell (TLC)

Three bits per cell; high cell density, but lower performance and endurance specifications; most often used in mass storage consumer applications (e.g.(客户端ssd, USB驱动器或SD卡)，具有非常高的成本敏感性

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Quad-level cell (QLC)

Four bits per cell; high cell density, but impact on latency more than throughput; most often used in applications that demand high-density mass storage (e.g.(企业应用程序)具有成本敏感性

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Managed NAND

托管NAND提供了更简单的解决方案，并加快了上市时间，因为控制器嵌入在封装中以处理磨损均衡, bad block management and ECC.

e.MMC memory

High-capacity NAND flash device combined with a high-speed MultiMediaCard (MMC) controller in a single BGA package; suitable for designers looking for a fully managed device and ease of design for MMC-like, 用于广泛网络的应用程序到应用程序的互操作性, industrial, and automotive applications 

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On-die ECC NAND

Hybrid between raw and fully managed NAND; ECC is integrated while wear leveling and bad block management are handled by the host controller 

Solid state drives

基于nand的驱动器，提高可靠性, reduce power, 并提供比硬盘驱动器(hdd)更快的性能。

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Universal flash storage (UFS)

UFS是一种高性能存储接口，适用于需要更快顺序的应用程序 & 随机性能优于eMMC，功耗低

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安全数字卡(SD)， micro SD/USB

SD, microSD卡和USB闪存驱动器是理想的应用程序，需要闪存易于拆卸或安装

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NAND for MCPs

越来越多的NAND闪存被用于多芯片封装(mcp)中，它与各种形式的移动LPDRAM配对. NAND/LPDRAM mcp的密度为SLC NAND的1GB至4GB, e的1GB至8GB.MMC™ embedded memory.

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Open NAND Flash Interface (ONFI)

开放NAND闪存接口(ONFI)是美光和许多其他NAND闪存供应商之间的合作, controller manufacturers, and designers. ONFI工作组的主要目标是开发用于与NAND闪存通信的接口的开放标准-这些标准将增加来自不同供应商的符合NAND设备之间的兼容性和互操作性. This, in turn, 是否会增加标准设备的供应基础, reduce design time, and speed time to market.

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