JEDEC eMMC 4.41标准：高容量存储与安全增强

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"eMMC4.41标准是JEDEC固态技术协会在2010年3月发布的一项嵌入式多媒体卡（Embedded MultiMediaCard, e•MMC）产品标准，该标准主要针对高容量存储，包括可靠写入、启动、睡眠模式、双数据速率、多分区支持、安全性增强、后台操作和高优先级中断等功能。标准编号为JESD84-A441。" eMMC4.41标准详细介绍： 1. **定义**：eMMC是一种集成的多媒体存储解决方案，将控制器和闪存集成在一个封装内，用于移动设备和其他嵌入式系统。它简化了系统设计，因为不需要额外的硬件来管理存储。 2. **高容量**：eMMC4.41标准着重于提高存储容量，以满足日益增长的数据存储需求。这使得它在智能手机、平板电脑和各种物联网设备中广泛应用。 3. **可靠写入**：标准中的可靠写入功能确保数据在写入存储器时的稳定性和完整性，这对于系统运行和用户数据的安全至关重要。 4. **启动功能**：eMMC支持快速启动，允许设备更快地进入操作系统，从而缩短开机时间，提升用户体验。 5. **睡眠模式**：睡眠模式旨在降低设备待机时的功耗，延长电池寿命，这对于移动设备尤其重要。 6. **双数据速率**（DDR）：eMMC4.41引入双数据速率，提高了数据传输速度，能够更快地读取和写入大量数据，提升了系统的响应速度。 7. **多分区支持**：标准支持多个逻辑分区，允许系统和用户数据的分离，便于系统更新和数据保护。 8. **安全性增强**：eMMC4.41提供了一套安全机制，包括加密和访问控制，以保护用户数据免受未经授权的访问或篡改。 9. **后台操作**：后台操作功能允许在主系统处理其他任务的同时进行数据读写，提高了系统效率和用户体验。 10. **高优先级中断**：高优先级中断功能确保关键任务得到及时处理，即使在高负载情况下也能优先完成。 11. **JEDEC标准**：作为JEDEC标准的一部分，eMMC4.41遵循了行业共识，旨在消除制造商和购买者之间的误解，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合适的产品。 eMMC4.41标准不仅提升了存储性能，还优化了能源效率和安全性，对于现代移动设备和嵌入式系统的存储需求具有重要意义。随着技术的不断发展，eMMC标准也在不断演进，以适应更高的性能和新的应用场景。

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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