©Copyright 2001-2006 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 2.00
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................................................................................................................................5
3.4 Speed Class ..................................................................................................................................6
3.5 Bus Topology.................................................................................................................................7
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
4. SD Memory Card Functional Description .......................................................................12
4.1 General........................................................................................................................................12
4.2 Card Identification Mode..............................................................................................................13
4.2.1 Card Reset............................................................................................................................13
4.2.2 Operating Condition Validation..............................................................................................13
4.2.3 Card Initialization and Identification Process ........................................................................15
4.3 Data Transfer Mode.....................................................................................................................17
4.3.1 Wide Bus Selection/Deselection ...........................................................................................19
4.3.2 2 GByte Card ........................................................................................................................19
4.3.3 Data Read.............................................................................................................................19
4.3.4 Data Write .............................................................................................................................20
4.3.5 Erase.....................................................................................................................................22
4.3.6 Write Protect Management ...................................................................................................22
4.3.7 Card Lock/Unlock Operation.................................................................................................23
4.3.7.1 General................................................................................................................................. 23
4.3.7.2 Parameter and the Result of CMD42.................................................................................... 25
4.3.7.3 Forcing Erase ....................................................................................................................... 27
4.3.7.3.1 Force Erase Function to the Locked Card...................................................................... 27
4.3.7.4 Relation Between ACMD6 and Lock/Unlock State................................................................ 28
4.3.7.5 Commands Accepted for Locked Card ................................................................................. 28
4.3.7.6 Two Types of Lock/Unlock Card............................................................................................ 29
4.3.8 Content Protection ................................................................................................................29
4.3.9 Application-Specific Commands............................................................................................29
4.3.9.1 Application-Specific Command – APP_CMD (CMD55)......................................................... 29
4.3.9.2 General Command - GEN_CMD (CMD56)........................................................................... 30
4.3.10 Switch Function Command .................................................................................................31
4.3.10.1 General............................................................................................................................... 31
4.3.10.2 Mode 0 Operation - Check Function ................................................................................... 32
4.3.10.3 Mode 1 Operation - Set Function........................................................................................33
4.3.10.4 Switch Function Status........................................................................................................ 35
4.3.10.4.1 Busy Status Indication for Functions ............................................................................ 36
4.3.10.4.2 Data Structure Version ................................................................................................. 37
