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©Copyright 2001-2006 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Specification Version 2.00
Confidential iv
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................................................................................................................................6
3.4 Speed Class ..................................................................................................................................7
3.5 Bus Topology .................................................................................................................................8
3.5.1 SD Bus ....................................................................................................................................8
3.5.2 SPI Bus ...................................................................................................................................9
3.6 Bus Protocol ................................................................................................................................10
3.6.1 SD Bus ..................................................................................................................................10
3.6.2 SPI Bus .................................................................................................................................13
3.7 SD Memory Card–Pins and Registers.........................................................................................14
4. SD Memory Card Functional Description .......................................................................16
4.1 General........................................................................................................................................16
4.2 Card Identification Mode..............................................................................................................17
4.2.1 Card Reset ............................................................................................................................17
4.2.2 Operating Condition Validation..............................................................................................17
4.2.3 Card Initialization and Identification Process ........................................................................19
4.3 Data Transfer Mode.....................................................................................................................21
4.3.1 Wide Bus Selection/Deselection ...........................................................................................23
4.3.2 2 GByte Card ........................................................................................................................23
4.3.3 Data Read .............................................................................................................................23
4.3.4 Data Write .............................................................................................................................24
4.3.5 Erase.....................................................................................................................................26
4.3.6 Write Protect Management ...................................................................................................26
4.3.7 Card Lock/Unlock Operation .................................................................................................27
4.3.7.1 General................................................................................................................................. 27
4.3.7.2 Parameter and the Result of CMD42.................................................................................... 29
4.3.7.3 Forcing Erase ....................................................................................................................... 31
4.3.7.3.1 Force Erase Function to the Locked Card...................................................................... 31
4.3.7.4 Relation Between ACMD6 and Lock/Unlock State................................................................ 32
4.3.7.5 Commands Accepted for Locked Card ................................................................................. 32
4.3.7.6 Two Types of Lock/Unlock Card............................................................................................ 33
4.3.8 Content Protection ................................................................................................................33
4.3.9 Application-Specific Commands............................................................................................34
4.3.9.1 Application-Specific Command – APP_CMD (CMD55)......................................................... 34
4.3.9.2 General Command - GEN_CMD (CMD56)........................................................................... 34
4.3.10 Switch Function Command .................................................................................................35
4.3.10.1 General............................................................................................................................... 35
4.3.10.2 Mode 0 Operation - Check Function ................................................................................... 37
4.3.10.3 Mode 1 Operation - Set Function........................................................................................37
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