JEDEC eMMC 4.5规范详解

4星 · 超过85%的资源需积分: 50 189 浏览量更新于2024-07-27 收藏 3.76MB PDF 举报

"eMMC v4.5 是JEDEC固态技术协会发布的一份电气标准，全称为Embedded Multi-Media Card（嵌入式多媒体卡）规范。这份标准详细定义了eMMC设备的电气特性和接口规格，旨在促进电子设备中存储组件的互换性和性能提升。" eMMC v4.5 规范是JEDEC组织制定的一套针对嵌入式多媒体存储卡的标准，主要针对电子设备中的非易失性存储解决方案。这一版本的更新着重在提高数据传输速度、增强系统的可靠性和兼容性。eMMC作为一个封装好的存储解决方案，将控制器和NAND闪存集成在一起，简化了硬件设计，使得制造商能更快地将产品推向市场。在eMMC v4.5中，关键的知识点包括： 1. **接口规范**：该版本规定了高速的SPI和四线接口，支持更高效的数据传输。这些接口允许设备以更高的速度读写数据，例如，支持HS200模式，理论最大速度可以达到200MB/s。 2. **错误校正代码（ECC）**：eMMC v4.5加强了对数据错误的检测和纠正能力，通过更强大的ECC算法确保数据的完整性，特别是在处理大量数据时。 3. **命令集增强**：增加了新的命令，如Host Protected Area (HPA) 和Device Configuration Overlay (DCO)，使得主机系统能更灵活地管理存储空间和配置设备。 4. **功耗管理**：为了适应移动设备的需求，eMMC v4.5引入了多种低功耗模式，如深度睡眠模式和休眠模式，以延长电池寿命。 5. **安全性**：标准还包含了对加密和安全功能的支持，如TRIM命令的改进，增强了数据的隐私保护和安全擦除。 6. **坏块管理**：eMMC v4.5提供了更完善的坏块管理机制，自动检测和标记坏块，避免了数据丢失并提高了存储介质的寿命。 7. **设备识别和状态报告**：通过增强的设备识别和状态报告机制，主机系统能够更好地监控和控制eMMC的状态，确保稳定运行。 8. **故障恢复**：标准定义了错误处理和故障恢复策略，使得设备在遇到异常情况时能自我恢复，提高了系统的稳定性。 9. **兼容性测试**：eMMC v4.5提供了全面的兼容性测试程序，确保不同供应商的产品间能无缝对接，降低了设备间的互操作性问题。 eMMC v4.5规范是一个综合性的标准，旨在推动电子设备存储技术的发展，提升存储性能，同时考虑了低功耗、安全性以及与各种系统的兼容性。对于开发基于eMMC的嵌入式系统来说，理解和应用这些知识点至关重要。

JEDEC Standard No. 84-B45

-xii-

EMBEDDED MULTI-MEDIA CARD (e•MMC), ELECTRICAL STANDARD (4.5 Device)

List of Tables (cont'd)

Page

Table 33 - RTC_INFO_TYPE Field Description ....................................................................................... 83

Table 34 - Command Format ...................................................................................................................... 88

Table 35 - Supported Device command classes (0–56) .............................................................................. 89

Table 36 - Basic commands (class 0 and class 1) ....................................................................................... 90

Table 37 - Block-oriented read commands (class 2) ................................................................................... 91

Table 38 - Class 3 commands ..................................................................................................................... 91

Table 39 - Block-oriented write commands (class 4) ................................................................................. 92

Table 40 - Block-oriented write protection commands (class 6) ................................................................ 94

Table 41 - Erase commands (class 5) .......................................................................................................... 95

Table 42- I/O mode commands (class 9) .................................................................................................... 96

Table 43 - Lock Device commands (class 7) .............................................................................................. 96

Table 44 - Application-specific commands (class 8) .................................................................................. 96

Table 45 - Device state transitions .............................................................................................................. 97

Table 46 - R1 response ............................................................................................................................... 99

Table 47 - R2 response ............................................................................................................................... 99

Table 48 - R3 Response ............................................................................................................................ 100

Table 49 - R4 response ............................................................................................................................. 100

Table 50 - R5 response ............................................................................................................................. 100

Table 51 - Device status ............................................................................................................................ 102

Table 52 - Device Status field/command - cross reference ....................................................................... 104

Table 53 - Response 1 Status Bit Valid .................................................................................................... 105

Table 54 - Timing Parameters ................................................................................................................... 116

Table 55 – Timing Parameters for HS200 mode ...................................................................................... 117

Table 56 - H/W reset timing parameters ................................................................................................... 120

Table 57 - OCR register definitions .......................................................................................................... 121

Table 58 - CID Fields ............................................................................................................................... 122

Table 59 - Device Types ........................................................................................................................... 122

Table 60 - CSD Fields ............................................................................................................................... 124

Table 61 - CSD register structure ............................................................................................................. 125

Table 62 - System specification version ................................................................................................... 125

Table 63 - TAAC access-time definition .................................................................................................. 125

Table 64 - Maximum bus clock frequency definition ............................................................................... 126

Table 65 - Supported Device command classes ........................................................................................ 126

Table 66 - Data block length ..................................................................................................................... 127

Table 67 - DSR implementation code table .............................................................................................. 127

Table 68 - V

(min) current consumption ............................................................................................... 128

Table 69 - V

(max) current consumption .............................................................................................. 128

Table 70 - Multiplier factor for device size .............................................................................................. 129

Table 71 - R2W_FACTOR ....................................................................................................................... 130

Table 72 - File formats .............................................................................................................................. 131

Table 73 - ECC type ................................................................................................................................. 131

Table 74 - CSD field command classes .................................................................................................... 132

Table 75 - Extended CSD ......................................................................................................................... 134

JEDEC Standard No. 84-B45

-xiii-

EMBEDDED MULTI-MEDIA CARD (e•MMC), ELECTRICAL STANDARD (4.5 Device)

List of Tables (cont'd)

Page

Table 76 - Device-supported command sets ............................................................................................. 138

Table 77 - HPI features ............................................................................................................................. 138

Table 78 - Background operations support ............................................................................................... 138

Table 79 - Context Management Context Capabilities ............................................................................. 139

Table 80 - Extended CSD Register Support ............................................................................................. 140

Table 81 - Generic Switch Timeout Definition ......................................................................................... 140

Table 82 - Power off long switch timeout definition ................................................................................ 140

Table 83 - Background operations status .................................................................................................. 141

Table 84 - Correctly programmed sectors number ................................................................................... 141

Table 85 - Initialization Time out value .................................................................................................... 141

Table 86 - TRIM/DISCARD Time out value ........................................................................................... 142

Table 87 - SEC Feature Support ............................................................................................................... 142

Table 88 - Boot information ..................................................................................................................... 143

Table 89 - Boot partition size .................................................................................................................... 143

Table 90 - Access size ............................................................................................................................... 144

Table 91 - Superpage size ......................................................................................................................... 144

Table 92 - Erase-unit size ......................................................................................................................... 144

Table 93 - Erase timeout values ................................................................................................................ 145

Table 94 - Reliable write sector count ...................................................................................................... 145

Table 95 - Write protect group size .......................................................................................................... 145

Table 96 - S_C_VCC, S_C_VCCQ timeout values .................................................................................. 146

Table 97 - Sleep/awake timeout values ..................................................................................................... 146

Table 98 - R/W access performance values .............................................................................................. 147

Table 99 - Power classes ........................................................................................................................... 148

Table 100 - Partition switch timeout definition ........................................................................................ 149

Table 101 - Out-of-interrupt timeout definition ........................................................................................ 149

Table 102 – Supported Driver Strengths ................................................................................................... 149

Table 103 - Device types .......................................................................................................................... 150

Table 104 - CSD register structure ........................................................................................................... 150

Table 105 - Extended CSD revisions ........................................................................................................ 150

Table 106 - Standard MMC command set revisions ................................................................................. 151

Table 107 - Power class codes .................................................................................................................. 151

Table 108 - HS_TIMING (timing and driver strength) ............................................................................ 152

Table 109 - HS_TIMING values .............................................................................................................. 152

Table 110 - Bus mode values .................................................................................................................... 152

Table 111 - Erased memory content values .............................................................................................. 152

Table 112 - Boot configuration bytes ....................................................................................................... 153

Table 113 - Boot config protection ........................................................................................................... 154

Table 114 - Boot bus configuration .......................................................................................................... 155

Table 115 - Bus Width and Timing Mode Transition ............................................................................... 156

Table 116- ERASE_GROUP_DEF .......................................................................................................... 156

Table 117 - BOOT area write protection .................................................................................................. 157

Table 118 - User area write protection ...................................................................................................... 159

JEDEC Standard No. 84-B45

-xiv-

EMBEDDED MULTI-MEDIA CARD (e•MMC), ELECTRICAL STANDARD (4.5 Device)

List of Tables (cont'd)

Page

Table 119 - FW Update Disable ............................................................................................................... 160

Table 120 - RPMB Partition Size ............................................................................................................. 160

Table 121 - Write reliability setting .......................................................................................................... 161

Table 122 - Write reliability parameter register ........................................................................................ 162

Table 123 - Background operations enable ............................................................................................... 162

Table 124 - H/W reset function ................................................................................................................. 163

Table 125 - HPI management ................................................................................................................... 163

Table 126 - Partitioning Support ............................................................................................................... 164

Table 127 - Max. Enhanced Area Size ..................................................................................................... 164

Table 128 - Partitions Attribute ................................................................................................................ 165

Table 129 - Partition Setting ..................................................................................................................... 165

Table 130 - General Purpose Partition Size .............................................................................................. 166

Table 131 - Enhanced User Data Area Size .............................................................................................. 166

Table 132 - Enhanced User Data Start Address ........................................................................................ 167

Table 133 - Secure Bad Block management ............................................................................................. 167

Table 134 - Initialization Time out value .................................................................................................. 169

Table 135 – Class 6 usage ......................................................................................................................... 169

Table 136 - EXCEPTION_EVENTS_CTRL[56] ..................................................................................... 170

Table 137 - EXCEPTION_EVENTS_CTRL[57] ..................................................................................... 170

Table 138 - EXCEPTION_EVENTS_STATUS[54] ................................................................................ 170

Table 139 - EXCEPTION_EVENT_STATUS[55] .................................................................................. 170

Table 140 - First Byte EXT_PARTITIONS_ATTRIBUTE[52] .............................................................. 171

Table 141 - Second Byte EXT_PARTITIONS_ATTRIBUTE[53] .......................................................... 171

Table 142 - CONTEXT_CONF configuration format .............................................................................. 172

Table 143- Packed Command Status Register .......................................................................................... 172

Table 144 - Valid POWER_OFF_NOTIFICATION values ..................................................................... 173

Table 145 - Error correction codes ........................................................................................................... 174

Table 146 - DSR register content .............................................................................................................. 181

Table 147 - General operating conditions ................................................................................................. 183

Table 148 - e•MMC power supply voltage ............................................................................................... 185

Table 149 - e•MMC voltage combinations ............................................................................................... 185

Table 150 - Capacitance ............................................................................................................................ 186

Table 151 - Open-drain bus signal level ................................................................................................... 187

Table 152 - Push-pull signal level—high-voltage e•MMC ...................................................................... 187

Table 153 - Push-pull signal level—1.65-1.95 VCCQ voltage Range ..................................................... 188

Table 154 - Push-pull signal level—1.1V-1.3V VCCQ range e•MMC .................................................... 188

Table 155 – I/O driver strength types ....................................................................................................... 189

Table 156 - Driver Type-0 AC Characteristics ........................................................................................ 190

Table 157 - High-speed Device interface timing ...................................................................................... 191

Table 158 - Backward-compatible Device interface timing ..................................................................... 192

Table 159 - High-speed dual rate interface timing .................................................................................... 193

Table 160 - HS200 Clock signal timing .................................................................................................... 194

Table 161 - HS200 Device input timing ................................................................................................... 196

剩余247页未读，继续阅读

winstonbao

粉丝: 0

JEDEC eMMC 4.5规范详解

EMMC协议标准4.4

emmc协议，里面有4.4和4.5和4.51和5.0四个pdf

emmc5.0协议

EMMC4.5 SPEC.pdf

最新发布的EMMC4.5 SPEC(JESD84-B45)

要的下载，EMMC协议4.5说明文档

eMMC协议4.5-5.0-5.1.zip

emmc.rar_eMMC_emmc 4.5

emmc规范4.5 5.0 5.1对比

eMMC V4.41和V4.5简介

最新资源