SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual page 4

Table of Contents
3.1.2. Pin Assignments in SPI Mode................................................................................................. 3-2
3.2. SD Bus Topology.............................................................................................................................. 3-3
3.2.1. Power Protection ..................................................................................................................... 3-5
3.3. SPI Bus Topology ............................................................................................................................. 3-5
3.3.1. Power Protection ..................................................................................................................... 3-6
3.4. Electrical Interface ............................................................................................................................ 3-6
3.4.1. Power-up ................................................................................................................................. 3-7
3.4.2. Bus Operating Conditions ....................................................................................................... 3-8
3.4.3. Bus Signal Line Load.............................................................................................................. 3-8
3.4.4. Bus Signal Levels.................................................................................................................... 3-9
3.4.5. Bus Timing.............................................................................................................................. 3-10
3.5. SD Card Registers ............................................................................................................................. 3-11
3.5.1. Operating Conditions Register (OCR) .................................................................................... 3-11
3.5.2. Card Identification (CID) Register.......................................................................................... 3-12
3.5.3. CSD Register........................................................................................................................... 3-13
3.5.4. SCR Register........................................................................................................................... 3-19
3.5.5. Status Register......................................................................................................................... 3-20
3.5.6. SD Status................................................................................................................................. 3-23
3.5.7. RCA Register .......................................................................................................................... 3-23
3.5.8. SD Card Registers in SPI Mode.............................................................................................. 3-24
3.6. Data Interchange Format and Card Sizes .......................................................................................... 3-24
4. Secure Digital (SD) Card Protocol Description.................................................................................................. 4-1
4.1. SD Bus Protocol................................................................................................................................ 4-1
4.2. Protocol's Functional Description..................................................................................................... 4-4
4.3. Card Identification Mode .................................................................................................................. 4-5
4.3.1. Reset........................................................................................................................................ 4-6
4.3.2. Operating Voltage Range Validation ...................................................................................... 4-7
4.3.3. Card Identification Process ..................................................................................................... 4-7
4.4. Data Transfer Mode .......................................................................................................................... 4-8
4.4.1. Wide Bus Selection/Deselection ............................................................................................. 4-10
4.4.2. Data Read Format ................................................................................................................... 4-10
4.4.3. Data Write Format .................................................................................................................. 4-11
4.4.4. Write Protect Management ..................................................................................................... 4-13
4.4.4.1. Mechanical Write Protect Switch .......................................................................... 4-13
4.4.4.2. Card's Internal Write Protection (Optional) .......................................................... 4-13
4.4.5. Application Specific Commands............................................................................................. 4-13
4.5. Clock Control .................................................................................................................................... 4-14
4.6. Cyclic Redundancy Codes (CRC)..................................................................................................... 4-15
4.7. Error Conditions................................................................................................................................ 4-17
4.7.1. CRC and Illegal Command ..................................................................................................... 4-17
4.7.2. Read, Write and Erase Time-out Conditions .......................................................................... 4-17
4.8. Commands......................................................................................................................................... 4-17
4.8.1. Command Types ..................................................................................................................... 4-18
4.8.2. Command Format.................................................................................................................... 4-18
4.8.3. Command Classes ................................................................................................................... 4-18
4.8.4. Detailed Command Description .............................................................................................. 4-20
4.9. Card State Transition Table............................................................................................................... 4-24
4.10. Responses........................................................................................................................................ 4-25
4.11. Timings ........................................................................................................................................... 4-27
4.11.1. Command and Response ....................................................................................................... 4-27
4.11.2. Data Read.............................................................................................................................. 4-28
iv SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION