eMMC 4.41官方标准：高容量、可靠写入与安全增强

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本资源是JEDEC（固态技术协会）于2010年发布的官方标准JESD84-A441，专门针对嵌入式多媒体卡（e•MMC，Embedded MultiMedia Card）的第4.41版产品规范。e•MMC是一种高容量存储解决方案，旨在满足现代电子设备对可靠写入、启动（Boot）、休眠模式、双速率传输、多分区支持、安全增强、后台操作以及高优先级中断等需求，适用于如移动设备、便携式电子设备等场景。该标准的主体分为多个部分： 1. **范围**：明确了标准的应用范围，包括了e•MMC的适用设备类型和功能特性。 2. **规范引用**：标准遵循其他相关的技术文档或标准，确保一致性与兼容性。 3. **术语和定义**：对关键术语进行定义，以便读者理解和使用，例如可靠写入、多分区等。 4. **通用描述**：概括了e•MMC的主要特点，强调其在现代电子设备中的关键作用。 5. **系统特性和功能**： - **高密度**：支持超过2GB的存储容量，适应数据存储容量的不断增长。 - **MMC+和MMC mobile**：区分不同版本的e•MMC，可能涉及性能提升和新特性。 - **卡片概念**：讨论卡片的物理形态和接口标准。 - **形式因子**：指明卡片的不同尺寸和形状规格。 - **总线概念**：包括总线线的数量和协议细节。 - **控制器概念**：阐述控制器的作用，以及应用适配器和e•MMC适配器架构的要求。 6. **多媒体卡系统概念**：深入探讨了e•MMC在多媒体系统中的集成和交互方式。 7. **详细实现**：这部分提供了更具体的技术实现细节，如如何通过控制器实现背景操作和高优先级中断等高级功能。这份标准对于开发基于e•MMC的硬件和软件工程师、制造商、系统设计师以及电子设备的消费者来说，都是非常重要的参考文献，它确保了产品的互操作性、性能和安全性。阅读和遵循此标准有助于提升产品的质量和市场竞争力。

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)

(From 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 IDentification number register

CLK: Clock signal

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

CRC: Cyclic Redundancy Check

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.

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