JESD84-A441：eMMC 4.41嵌入式媒体卡标准详解

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JESD84-A441 EMMC 4.41规范是由JEDEC（固态技术协会）制定的一份标准，该标准主要关注嵌入式多媒体卡（eMMC）的高容量版本，它在2010年3月发布。eMMC是专为移动设备设计的非易失性闪存存储解决方案，旨在提供可靠的数据写入、引导、睡眠模式、双速数据传输、多分区支持、增强的安全性以及后台操作和高优先级中断功能。这款标准的全称为“MMCA 4.41”，适用于对设备性能有较高要求的应用场景，如智能手机、平板电脑和其他消费电子产品。 JESD84-A441规范的核心要点包括： 1. **容量提升**：强调了eMMC的高容量特性，以满足现代电子设备对大容量存储的需求，这有助于设备提供更多的存储空间以存放应用程序、媒体文件等。 2. **可靠性和性能**：标准涵盖了可靠的数据写入机制，确保在频繁读写操作中的数据一致性，并支持双速数据率（DDR），提高数据传输速度。 3. **多功能模式**：包括启动（Boot）模式、睡眠（Sleep）模式，允许设备在不同功耗状态间切换，节省电能，延长电池续航。 4. **安全性增强**：考虑到了存储安全，可能包含加密技术和用户权限管理，保护敏感数据免受未经授权的访问。 5. **兼容性与互换性**：通过标准化，确保不同厂商生产的eMMC产品之间的兼容性，简化供应链管理和设备升级过程。 6. **后台操作与中断处理**：支持高优先级中断，使得设备在处理紧急任务时能够快速响应，提升用户体验。 7. **法律声明**：JEDEC标准和出版物的使用遵循严格的审查流程，旨在消除制造商和消费者之间的误解，促进产品间的通用性和质量提升，同时确保在全球范围内公平地推广使用。 JESD84-A441 EMMC 4.41规范是电子设备存储领域的基石，对于优化设备性能、增强用户体验以及推动产业健康发展具有重要意义。任何希望采用或开发基于eMMC的设备的制造商和开发者，都需要熟悉并遵守这一标准，以确保产品的稳定性和市场竞争力。

JEDEC Standard No. 84-A441

-xii-

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)

CONTENTS(continued)

Page

Figure 43 — Stop transmission after last data block; card is busy programming ................................ 107

Figure 44 — Stop transmission after last data block; card becomes busy............................................ 107

Figure 45 — Bus test procedure timing ................................................................................................ 108

Figure 46 — Boot operation, termination between consecutive data blocks........................................ 108

Figure 47 — Boot operation, termination during transfer .................................................................... 109

Figure 48 — Bus mode change timing (push-pull to open-drain) ........................................................ 109

Figure 49 — Alternative boot operation, termination between consecutive data blocks...................... 110

Figure 50 — Alternative boot operation, termination during transfer .................................................. 110

Figure 51 — H/W reset waveform........................................................................................................ 112

Figure 52 — Noise filtering timing for H/W reset................................................................................ 112

Figure 53 — CRC7 generator/checker.................................................................................................. 158

Figure 54 — CRC16 generator/checker................................................................................................ 159

Figure 55 — Bus circuitry diagram....................................................................................................... 163

Figure 56 — Improper power supply.................................................................................................... 164

Figure 57 — Shortcut protection........................................................................................................... 164

Figure 58 — Power-up diagram............................................................................................................ 165

Figure 59 — e•MMC power-up diagram ..............................................................................................167

Figure 60 — The e•MMC power cycle................................................................................................. 168

Figure 61 — MultiMediaCard bus driver ............................................................................................. 170

Figure 62 — e•MMC internal power diagram ...................................................................................... 172

Figure 63 — Bus signal levels .............................................................................................................. 174

Figure 64 — Timing diagram: data input/output .................................................................................. 176

Figure 65 — Timing diagram: data input/output in dual data rate mode.............................................. 179

Figure A.1 — Power supply decoupling................................................................................................. 185

Figure A.2 — Modified MultiMediaCard connector for hot insertion ................................................... 186

Figure A.3 — Legend for command-sequence flow charts .................................................................... 189

Figure A.4 — SEND_OP_COND command flow chart ........................................................................ 190

Figure A.5 — CIM_SINGLE_CARD_ACQ .......................................................................................... 191

Figure A.6 — CIM_SETUP_CARD....................................................................................................... 192

Figure A.7 — CIM_STREAM_READ................................................................................................... 193

Figure A.8 — CIM_READ_BLOCK ..................................................................................................... 193

Figure A.9 — CIM_READ_MBLOCK.................................................................................................. 194

Figure A.10 — CIM_WRITE_MBLOCK ................................................................................................ 195

Figure A.11 — CIM_ERASE_GROUP.................................................................................................... 196

Figure A.12 — CIM_SECURE_ERASE..................................................................................................197

Figure A.13 — CIM_SECURE_TRIM..................................................................................................... 198

Figure A.14 — CIM_TRIM...................................................................................................................... 199

Figure A.15 — CIM_US_PWR_WP ........................................................................................................ 200

Figure A.16 — CIM_US_PERM_WP...................................................................................................... 201

Figure A.17 — Bus testing for eight data lines......................................................................................... 205

Figure A.18 — Bus testing for four data lines .......................................................................................... 205

Figure A.19 — Bus testing for one data line ............................................................................................ 205

Figure A.20 — Erase-unit size selection flow .......................................................................................... 207

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