eMMC协议详解：JEDEC JESD84-A441

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"eMMC协议-4.41是JEDEC固态技术协会发布的一个标准，全称为嵌入式多媒体卡(eMMC)的高容量产品标准，包括可靠写入、启动、睡眠模式、双数据速率、多分区支持、安全增强、后台操作和高优先级中断等功能。该标准详细阐述了eMMC4.41协议的各个方面，旨在消除制造商与购买者之间的误解，促进产品的互换性，改进产品，并帮助购买者快速选择和获取正确的产品，无论是在国内还是国际市场上。JEDEC标准不考虑是否涉及专利或其他知识产权问题。" eMMC协议是一种用于存储设备的接口规范，主要用于移动设备如智能手机和平板电脑。eMMC4.41是这个协议的一个版本，它在之前的版本基础上增加了新的特性和功能。以下是eMMC4.41协议的一些关键知识点： 1. **可靠写入**：eMMC4.41协议支持可靠写入功能，确保数据在写入存储介质时的完整性和稳定性，这对于系统更新和数据保存至关重要。 2. **启动功能**：该协议允许设备直接从eMMC启动，简化了系统启动过程，降低了对其他硬件组件的依赖。 3. **睡眠模式**：为了节省能源，eMMC4.41引入了多种睡眠模式，能够在保持低功耗的同时，快速恢复到工作状态。 4. **双数据速率**：eMMC4.41支持双数据速率传输，提高了数据传输的速度，使得读写操作更加高效。 5. **多分区支持**：通过多分区功能，eMMC可以被划分为不同的逻辑区域，便于操作系统和应用程序的管理，同时提供了更高的安全性。 6. **安全增强**：eMMC4.41包含了一系列的安全特性，如加密和访问控制，保护存储在其中的数据免受未经授权的访问。 7. **后台操作**：协议允许在不影响用户界面性能的情况下进行后台数据处理，如数据备份和更新，提高了用户体验。 8. **高优先级中断**：此功能允许eMMC处理紧急或高优先级的任务，确保关键操作能够及时完成。 9. **兼容性**：作为JEDEC标准，eMMC4.41设计为与其他符合标准的设备兼容，保证了不同制造商产品间的互换性。 10. **知识产权问题**：尽管标准的制定可能涉及到专利，但JEDEC标准的采用并不考虑这些问题，目的是促进技术和产品的广泛采用和进步。 eMMC4.41协议的实施使得嵌入式存储设备在性能、能效和可靠性方面有了显著提升，对移动设备的性能优化和用户体验改善起到了重要作用。了解并掌握这些知识点对于设计和开发使用eMMC存储的设备至关重要。

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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