SanDisk SD Card

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Revision 2.2Chapter 3 – SD Card Interface DescriptionSD Card Product Manual3.5.5 SD Status RegisterThe SD Status Register contains status bits that are related to the SD Card proprietaryfeatures and may be used for future application specific usage. The size of the SD Status isone data block of 512 bits. The content of this register is transmitted to the Host over theDAT bus along with 16 bits CRC. The SD Status is sent to the host over the DAT bus ifACMD13 is sent (CMD55 followed with CMD13). ACMD13 can be sent to a card only in‘tran_state’ (card selected). The SD Status structure is listed in Table 3-30. The sameabbreviations for ‘type’ and ‘clear condition’ were used as for the Card Status above.Table 3-30SD Card StatusBits Identifier Type Value Description ClearCond.511-510DAT_BUS_WIDTH S R 00=1 (default)01=reserved10= 4-bit width11=reservedShows the currently defined databus width that was defined by theSET_BUS_WIDTH commandA509 SECURED_MODE S R 0=not in themode1=securedmodeCard is in Secured Mode ofoperation (refer to the SDSecurity Specificationsdocument).A508-496Reserved495-480SD_CARD_TYPE S R ‘00xxh’=SDMemory Cardsas defined inPhysical Spec.Ver.1.01(‘x’=don’tcare).Thefollowing cardsare currentlydefined:‘0000’=Regular SDRD/WRCard.‘0001’=SD ROM CardIn the future, the 8 LSBs will beused to define different variationsof an SD Card (each bit willdefine different SD types). The 8MSBs will be used to define SDCards that do not comply withthe SD Memory Card as definedin the Specification Ver. 1.01A479-448SIZE_OF_PROTECTED_AREAS RSize ofprotected area(in units ofMULT*BLOCK_LEN refer toCSD register).Shows the size of the protectedarea. The actual area =(SIZE_OF_PROTECTED_AREA)* MULT * BLOCK_LEN.A447-312Reserved311-0Reserved for manufacturer3.5.6 Relative Card Address RegisterThe 16-bit Relative Card Address (RCA) Register carries the card address that ispublished by the card during the card identification. This address is used for the addressedhost-card communication after the card identification procedure.© 2004 SanDisk Corporation 3-22 12/08/04
Revision 2.2Chapter 3 – SD Card Interface DescriptionSD Card Product Manual3.5.7 SD Card Registers in SPI ModeIn SPI mode, all the card’s registers are accessible. Their format is identical to the format inthe SD Card mode. However, a few fields are irrelevant in SPI mode. In SPI mode, the cardstatus register has a different, shorter, format as well. Refer to the SPI Protocol section formore details.3.6 Data Interchange Format and Card SizesIn general, SD Card data is structured by means of a file system. The SD Card File SystemSpecification, published by the SD Association, describes the file format system that isimplemented in the SanDisk SD Card. In general, each SD Card is divided into twoseparate DOS-formatted partitions as follows:• User Area—used for secured and non-secured data storage and can be accessed by theuser with regular read/write commands.• Security Protected Area—used by copyright protection applications to save securityrelated data and can be accessed by the host using the secured read/write commandafter doing authentication as defined in the SD Security Specification. The securityprotected area size is defined by SanDisk as approximately one percent of the total sizeof the card. Tables 3-31 and 3-32 describe the user and protected areas for all SanDiskSD Cards.Table 3-31 User Area DOS Image ParametersCapacityTotalLBAsNumber ofPartitionSystem AreaSectorsTotal PartitionSectorsUser DataSectorsUser DataBytes16 MB 28,800 39 28,743 28,704 14,696,44832 MB 59,776 45 59,725 59,680 30,556,16064 MB 121,856 57 121,817 121,760 62,341,120128 MB 246,016 95 245,919 245,824 125,861,888256 MB 494,080 155 493,979 493,824 252,837,888512 MB 990,976 275 990,627 990,352 507,060,2241 GB 1,984,000 519 1,983,495 1,982,976 1,015,283,7122 GB 3,917,072 519 3,967,239 3,966,720 2,030,960,640Table 3-32Protected Area DOS Image ParametersCapacityTotalLBAsNumber ofPartitionSystem AreaSectorsTotal PartitionSectorsUser DataSectorsUser DataBytes16 MB 352 35 351 316 161,79232 MB 736 37 733 696 356,35264 MB 1,376 37 1,373 1,336 684,032128 MB 2,624 35 2,611 2,576 1,318,912256 MB 5,376 37 5,365 5,328 2,727,936© 2004 SanDisk Corporation 3-23 12/08/04
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SanDisk SD Card

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