JEDEC eMMC 4.3 规范：高性能嵌入式多媒体卡标准

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"JEDEC eMMC 4.3 规范是JEDEC固态技术协会在2007年11月发布的一项官方标准，全称为JESD84-A43，它定义了嵌入式多媒体卡（eMMC）的产品标准，重点关注高容量、可靠写入、启动和睡眠模式等功能。这份文档由leiyu@fmsh.com.cn于2020年7月16日下载。" 嵌入式多媒体卡（eMMC）是一种集成存储解决方案，广泛应用于移动设备如智能手机和平板电脑中。eMMC 4.3规范主要涵盖以下几个核心知识点： 1. **高容量存储**：随着移动设备对存储需求的增长，eMMC 4.3支持更高的存储容量，使得用户可以存储更多的应用程序、照片、视频和其他数据。 2. **可靠写入**：为了确保数据的完整性和持久性，规范引入了可靠的写入机制。这包括错误校验、数据保护和恢复策略，以防止数据丢失或损坏，尤其在快速读写操作中。 3. **启动功能**：eMMC 4.3支持快速启动设备的能力，这对于手机和便携式设备非常重要，因为它可以减少开机时间，提高用户体验。 4. **睡眠模式**：为了节省能源，eMMC规范定义了不同级别的睡眠模式，允许设备在不使用时进入低功耗状态，同时能够快速唤醒以恢复操作。 5. **互换性**：JEDEC标准旨在促进不同制造商的eMMC产品之间的兼容性和互换性，确保消费者能够在不同设备上无缝使用相同的存储卡。 6. **性能指标**：eMMC 4.3可能包括关于传输速度、I/O接口规范、命令集、电源管理等方面的详细性能指标，这些都对设备的整体性能有直接影响。 7. **专利与知识产权**：尽管JEDEC标准不涉及专利问题，但它们的存在意味着开发者和制造商必须尊重任何可能涉及的专利权，并确保其产品符合标准的同时不会侵犯他人的知识产权。 8. **国际应用**：JEDEC标准适用于全球市场，无论是在国内还是国际市场，都能帮助消费者快速识别和选择合适的产品，减少选购和使用过程中的延误和困扰。 9. **测试与验证**：eMMC 4.3规范还可能包含详细的测试程序和要求，以确保所有符合标准的产品都达到规定的性能和可靠性标准。 JEDEC eMMC 4.3规范是移动设备存储领域的重要参考，它定义了一系列技术要求和操作模式，以提高存储效率、保证数据安全并优化用户体验。对于硬件设计者、软件开发者以及电子设备制造商来说，理解和遵循这一标准至关重要。

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

Page 3

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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