eMMC 4.4标准协议详解：助力eMMC开发

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EMMC4.4协议标准（MMCA, 4.41）是JEDEC（固态技术协会）发布的一份关键文档，专为嵌入式多媒体卡（eMMC）的设计与开发提供指导。这份标准定义了eMMC 4.4版本的特性，旨在提升卡片的性能、可靠性和安全性。以下是该协议的主要知识点： 1. **高容量支持**：eMMC 4.4协议允许设计者构建具有更大存储容量的设备，满足不断增长的数据存储需求。 2. **可靠的写入功能**：该标准强调了数据写入的稳定性，确保在各种工作条件下都能进行高效的写入操作，减少了数据丢失的风险。 3. **多模式支持**：包括启动（Boot）、睡眠（Sleep）模式，使得设备能够在低功耗状态下维持正常运行，同时在需要时快速唤醒。 4. **双速率数据传输**：eMMC 4.4引入了双速率模式，可以提高数据读写速度，提升用户体验。 5. **分区管理**：支持多个逻辑分区，使得存储空间更加灵活，方便用户根据应用需求进行定制。 6. **安全增强**：考虑到了数据安全，可能涉及加密、访问控制等措施，保护敏感信息免受未经授权的访问。 7. **后台操作和高优先级中断**：允许设备在执行其他任务的同时处理紧急或后台任务，提高了系统的响应速度和效率。 8. **开放性与互换性**：JEDEC标准旨在消除制造商和消费者之间的误解，确保产品在全球范围内具有良好的兼容性和互换性，便于用户选择合适的产品。 9. **版权声明**：JEDEC的标准和出版物通过董事会和法律团队的审查，确保其内容的合法性和准确性。 eMMC 4.4协议标准为嵌入式设备的设计者提供了明确的技术框架和规范，使得开发者能够创建出性能优良、安全可靠且易于集成的eMMC产品，适应现代电子设备对存储技术日益增长的需求。遵循这一标准，制造商和用户能够更好地实现设备的功能扩展、性能优化和市场竞争优势。

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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