eMMC Ver 4.41标准：高容量、增强安全的嵌入式多媒体卡规范

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eMMC Ver 4.41是JEDEC (Joint Electron Device Engineering Council) 发布的一种嵌入式多媒体卡（Embedded MultiMedia Card, eMMC）的标准规格，于2010年3月制定。这个版本的eMMC标准旨在提供高容量存储解决方案，支持可靠写入、引导模式、睡眠模式、双速数据传输（Dual Data Rate）、多分区功能、安全增强、后台操作以及高优先级中断。MMCA (Memory Card Association) 4.41是该标准的具体实现。该标准的主要特点包括： 1. **高容量支持**：eMMC 4.41可提供大容量存储，满足现代设备对存储空间的需求，如智能手机、平板电脑和固态硬盘等。 2. **可靠性与性能**：它强调了写入操作的可靠性，确保在长时间使用后仍能保持数据的完整性。 3. **多种模式**：包括引导模式（用于设备启动时的初始化），睡眠模式以节省电力消耗，适合低功耗设备。 4. **双速数据传输**：通过支持不同速率，提高数据读写速度，提升用户体验。 5. **多分区**：允许用户将eMMC划分为多个独立区域，便于管理和数据保护。 6. **安全增强**：考虑到了数据隐私和系统安全，可能包含加密和认证机制，保护敏感信息。 7. **后台操作与中断处理**：设计允许在不影响用户体验的情况下进行后台任务，同时支持高优先级中断，确保关键任务的及时响应。值得注意的是，JEDEC在发布标准时会遵循一定的流程，由董事会和法律顾问审查，以确保内容准确无误，并且不侵犯任何专利权或知识产权。这意味着采用eMMC 4.41标准的产品制造商和消费者，无论在国内还是国际市场上，都可以基于这些规范进行产品开发和采购，从而促进产品间的互换性和整体技术进步。 eMMC Ver 4.41是现代电子设备中广泛应用的一种嵌入式存储技术，它的出现推动了移动设备存储性能的提升，同时确保了系统的稳定性和安全性。对于硬件开发者和系统设计师来说，理解和遵循这一标准至关重要，以确保他们的产品能够满足市场需求并符合行业最佳实践。

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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