SD Specifications---Physical Layer V3.01 免费

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【文件名】:121024@52RD_Part_1_Physical_Layer_Simplified_Specification_Ver_3.01_Final_100518.pdf
【格　式】:pdf
【大　小】:1254K
【简　介】:
【目　录】:


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