EMMC 4.41协议详解：英文原版官方文档

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"EMMC_JESD84-A441 emmc4.41 协议英文原档.pdf 是一份详细介绍了嵌入式多媒体卡（eMMC）4.41版本协议的官方英文文档。该文档覆盖了eMMC在智能电话、相机、组织者、PDA、数字录音机、MP3播放器、寻呼机、电子玩具等多种应用中的通用低成本数据存储和通信功能。其目标特性是高移动性和高性能，同时价格低廉，包括低功耗和高内存卡接口的数据吞吐量。" 嵌入式多媒体卡（eMMC）是一种集成的存储解决方案，旨在为各种电子设备提供高容量、可靠的存储。JESD84-A441标准详细规定了eMMC 4.41版本的规范，包括可靠写入、启动、睡眠模式、双数据率、多分区支持、安全增强、后台操作和高优先级中断等功能。文档的主要内容分为多个部分： 1. 范围：这部分概述了eMMC 4.41协议的适用范围和目的，定义了该标准涵盖的技术领域。 2. 引用标准：列出与eMMC 4.41相关的其他规范和技术文档，这些是理解和实现eMMC功能所必需的。 3. 术语和定义：定义了在标准中使用的专业术语，帮助读者理解文档中的技术细节。 4. 一般描述：简要介绍eMMC的基本概念和功能特性。 5. 系统特性：详细描述了eMMC系统在性能、可靠性、电源管理等方面的具体要求。 6. 多媒体卡系统概念：这部分深入讨论了eMMC的架构，包括当存储密度超过2GB时的设计考虑，以及MMCplus和MMCmobile的区别。 7. 卡概念：介绍了eMMC的形式因素，如物理尺寸，以及总线概念，包括总线线路和协议。 8. 控制器概念：详述了控制器在eMMC系统中的作用，包括应用适配器的要求和多媒体卡适配器的架构设计。 9. 更多章节可能涵盖了命令集、电气规格、测试方法、错误管理和故障恢复机制等，确保eMMC能在不同环境和条件下稳定工作。这份文档对于硬件工程师、固件开发者、系统架构师以及那些需要理解eMMC工作原理的人员来说非常有价值，因为它提供了全面的技术细节，有助于设计和实现支持eMMC 4.41标准的产品。通过深入阅读和理解这份文档，专业人士能够优化他们的存储解决方案，提高设备的性能和用户体验。

JEDEC Standard No. 84-A441

Page 1

Embedded MultiMediaCard (e•MMC) e•MMC/Card Product Standard, High Capacity,

including Reliable Write, Boot, Sleep Modes, Dual Data Rate, Multiple Partitions

supports, Security enhancement, Background Operation and High Priority

Interrupt (MMCA 4.41)

(Fro

m BoD ballot, JCB-10-08, formulated under the cognizance of the JC-64 committee on Flash

Memory Modules)

1 Scope

This

document provides a comprehensive definition of the MMC/e•MMC Electrical Interface, its

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

and algorithms intended to reduce design-in costs.

2 Normative reference

The

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

provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these

publications 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

NOTE

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

CID: Card IDentific

ation number register

CLK: Clock signal

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

CRC: Cyclic Redundancy Check

EMMC 4.41

JEDEC Standard No. 84-A441

Page 5

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, which

differ only in the valid range of system V

. These two card types are referred to as High Voltage Multi-

MediaCard 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.

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

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

simplify the design process.

Annex B lists the errata for the current version of this standard.

Annex C lists the major changes between the previous and the current version of this standard.

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.

EMMC 4.41

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EMMC 4.41协议详解：英文原版官方文档

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JESD84-A441 EMMC 4.41规范

【JESD84-A441】e•MMC/CARD产品标准(MMCA, 4.41)【2010.03】

JESD84-A441

Embedded Multi-Media Card (e•MMC) Product Standard V4.41 JESD84-A441

eMMC协议详解：JEDEC JESD84-A441

JESD84-A441: e•MMC/CARD 4.41标准详解

SD/EMMC标准协议版本V4.41

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