©Copyright 2001-2010 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 3.01
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Table of Contents
1. General Description............................................................................................................1
2. System Features.................................................................................................................3
3. SD Memory Card System Concept....................................................................................5
3.1 Read-Write Property......................................................................................................................5
3.2 Supply Voltage...............................................................................................................................5
3.3 Card Capacity................................................................................................................................5
3.3.1 User Area and Protected Area ................................................................................................5
3.3.2 Card Capacity Classification ...................................................................................................5
3.4 Speed Class ..................................................................................................................................6
3.5 Bus Topology .................................................................................................................................6
3.6 Bus Protocol ..................................................................................................................................7
3.6.1 SD Bus ....................................................................................................................................7
3.6.2 SPI Bus .................................................................................................................................10
3.7 SD Memory Card–Pins and Registers......................................................................................... 11
3.8 ROM Card ................................................................................................................................... 11
3.8.1 Register Setting Requirements .............................................................................................11
3.8.2 Unsupported Commands ......................................................................................................11
3.8.3 Optional Commands ............................................................................................................. 11
3.8.4 WP Switch.............................................................................................................................12
3.9 Ultra High Speed Phase I (UHS-I) Card ......................................................................................13
3.9.1 UHS-I Operation Modes........................................................................................................13
3.9.2 UHS-I Card Types .................................................................................................................13
3.9.3 Host and Card Combination..................................................................................................14
3.9.4 Bus Speed Modes Selection Sequence ................................................................................15
3.9.5 UHS System Block Diagram .................................................................................................16
3.9.6 Summary of Bus Speed Mode ..............................................................................................17
4. SD Memory Card Functional Description .......................................................................18
4.1 General........................................................................................................................................18
4.2 Card Identification Mode..............................................................................................................19
4.2.1 Card Reset ............................................................................................................................19
4.2.2 Operating Condition Validation..............................................................................................19
4.2.3 Card Initialization and Identification Process ........................................................................21
4.2.3.1 Initialization Command (ACMD41)........................................................................................ 23
4.2.4 Bus Signal Voltage Switch Sequence ...................................................................................24
4.2.4.1 Initialization Sequence for UHS-I .......................................................................................... 24
4.2.4.2 Timing to Switch Signal Voltage............................................................................................ 25
4.2.4.3 Timing of Voltage Switch Error Detection.............................................................................. 25
4.2.4.4 Voltage Switch Command..................................................................................................... 25
4.2.4.5 Tuning Command ................................................................................................................. 25
4.2.4.6 An Example of UHS-I System Block Diagram....................................................................... 26
4.3 Data Transfer Mode.....................................................................................................................27
4.3.1 Wide Bus Selection/Deselection ...........................................................................................29
4.3.2 2 GByte Card ........................................................................................................................29
dtcmzt2013-09-08我觉得这种资料还是英文的讲的详实一些，谢谢了
a121207272015-05-08很实用的文档
