JESD84-A43: eMMC/CARD产品标准 - 高容量，可靠写入，启动与休眠模式

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"JESD84-A43是JEDEC固态技术协会在2007年11月发布的一项标准，针对嵌入式多媒体卡（e•MMC）及e•MMC/CARD产品，专注于高容量、可靠写入、启动和睡眠模式，即MMCA（多媒体卡应用）4.3版本。此标准旨在消除制造商与购买者之间的误解，促进产品的互换性和改进，帮助购买者迅速选择并获取合适的产品，不论是在国内还是国际市场。标准的制定不考虑可能涉及的专利或知识产权问题，JEDEC并不承担由此产生的任何责任。" **详细知识点说明** 1. **e•MMC（嵌入式多媒体卡）**：e•MMC是一种集成化的存储解决方案，将控制器和 NAND 闪存封装在一起，用于移动设备如智能手机和平板电脑。它简化了系统设计，因为无需额外的存储控制器，同时提供了可靠的性能和稳定性。 2. **JEDEC固态技术协会**：JEDEC是一个全球性的电子组件标准组织，负责制定存储器和固态技术的标准。他们的工作对于确保不同制造商的产品间有良好的兼容性至关重要。 3. **MMCA（多媒体卡应用）4.3版本**：这是e•MMC标准的一个重要更新，增加了对高容量的支持，以及可靠写入、启动和睡眠模式等新特性。这些特性对于提高设备的能效和用户体验有着显著影响。 4. **可靠写入**：标准中的“可靠写入”是指在处理大量数据时，e•MMC能确保数据的完整性和一致性，即使在断电或系统故障的情况下，也能避免数据丢失。 5. **启动模式**：这个特性优化了设备的开机和恢复过程，使得电子设备能够更快地从休眠或关机状态启动，提升了用户使用的便利性。 6. **睡眠模式**：睡眠模式是为了节省电源而设计的，允许设备在不使用时进入低功耗状态，同时能快速恢复到工作状态，这对于电池供电的移动设备尤为重要。 7. **互换性**：JEDEC标准的目的是促进不同厂商生产的e•MMC产品之间具有互换性，这意味着一个设备可以使用任何符合该标准的e•MMC卡，而不用担心兼容性问题。 8. **知识产权与专利**：尽管标准可能涉及到专利技术，但JEDEC在制定标准时不考虑这些因素，其目的是推动行业的技术进步和标准化，而非解决知识产权问题。 JESD84-A43标准为e•MMC/CARD产品设定了统一的技术规范，确保了产品性能、可靠性和效率，同时也促进了整个行业的创新和发展。

JEDEC Standard No. 84-A43

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JEDEC Standard No. 84-A43

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Embedded MultiMediaCard (eMMC) eMMC/Card, High Capacity,

including Reliable Write, Boot, and Sleep Modes

(From BoD ballot, JCB-07-107, formulated under the cognizance

of the JC-64 committee on Flash Memory Modules)

1 Scope

This document provides a comprehensive definition of the MMC/eMMC Electrical Interface, its environ-

ment, and handling. It also provides design guidelines and defines a tool box of macro functions and algo-

rithms intended to reduce design-in costs.

2 Normative reference

The following normative documents contain provisions that, through reference in this text, constitute pro-

visions of this standard. For dated references, subsequent amendments to, or revisions of, any of these pub-

lications do not apply. However, parties to agreements based on this standard are encouraged to investigate

the possibility of applying the most recent editions of the normative documents indicated below. For

undated references, the latest edition of the normative document referred to applies.

3 Terms and definitions

For the purposes of this publication, the following abbreviations for common terms apply:

Block a number of bytes, basic data transfer unit

Broadcast a command sent to all cards on the MultiMediaCard bus

CID Card IDentification number register

CLK clock signal

CMD command line or MultiMediaCard bus command (if extended CMDXX)

CRC Cyclic Redundancy Check

CSD Card Specific Data register

DAT data line

DSR Driver Stage Register

eMMC embedded MultiMediaCard

Flash a type of multiple time programmable non volatile memory

Group a number of write blocks, composite erase and write protect unit

LOW, HIGH binary interface states with defined assignment to a voltage level

NSAC defines the worst case for the clock rate dependent factor of the data access time

1. Broadcast occurs only in MultiMediaCard systems supporting versions prior to 4.0. In version 4.0 and

later only one card can be present on the bus.

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JEDEC Standard No. 84-A43

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4 General description

The MultiMediaCard is an universal low cost data storage and communication media. It is designed to

cover a wide area of applications as smart phones, cameras, organizers, PDAs, digital recorders, MP3 play-

ers, pagers, electronic toys, etc. Targeted features are high mobility and high performance at a low cost

price. These features include low power consumption and high data throughput at the memory card inter-

face.

The MultiMediaCard communication is based on an advanced 13-pin bus. The communication protocol is

defined as a part of this standard and referred to as the MultiMediaCard mode.

To provide for the forecasted migration of CMOS power (V

) requirements and for compatibility and

integrity of MultiMediaCard systems, two types of MultiMediaCards are defined in this standard specifica-

tion, which differ only in the valid range of system V

. These two card types are referred to as High Volt-

age MultiMediaCard and Dual Voltage MultiMediaCard.

The purpose of the system specification is the definition of the MultiMediaCard, its environment and han-

dling. It gives guidelines for a system designer. The system specification also defines a tool box (a set of

macro functions and algorithms) which contributes to reducing the design-in costs.

The document is split up into several portions. The MultimediaCard Features are described in Section 5.

Section 6 gives a general overview of the system components: card, bus, and host.

The common MultiMediaCard characteristics are described in Section 7. As this description defines an

overall set of card properties, you should work with the vendor-specific, product documentation in parallel.

Section 8 describes the card registers.

The SPI mode is removed from this standard.

All error protection techniques employed in this standard are described in Section 10.

Section 11 describes the physical and mechanical properties of the cards and the minimal requirements of

the card slots and cartridges.

Section 12 defines the MultiMediaCard bus as a

universal communication interface and the electrical

parameters of the interface.

The standard compliance criteria for the cards and hosts are described in Section 13.

For achieving high data interchangeability, three basic file formats are defined in Section 14 as valid file

formats for the MultiMediaCard

Annex A contains additional information that is informative in nature and not considered a constituent part

of this specification. These Application Notes contain useful hints for the circuit and system designers,

helping simplify the design process.

Annex B lists the major changes between the previous and the current version of this specification.

As used in this document, “shall” or “will” denotes a mandatory provision of the standard. “Should”

denotes a provision that is recommended but not mandatory. “May” denotes a feature whose presence does not

preclude compliance, that may or may not be present at the option of the implementor.

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