Product manual

Industrial Grade SD Card Interface Description
3-20 SanDisk Industrial Grade SD Product Manual, Rev. 1.0 © 2003 SANDISK CORPORATION
3.5.4. SCR Register
In addition to the CSD register, there is another configuration register that is named SD CARD Configuration
Register (SCR). SCR provides information on special features that were configured into the given card. The size of
SCR register is 64 bit. This register shall be set in the factory by the SD Card manufacturer. Table 3-23 describes
the SCR register content.
Table 3-23. SCR Fields
Description Field Width Cell Type SCR Slice SCR Value SCR Code
SCR Structure SCR_STRUCTURE 4 R [63:60] V1.0 0
SD Card—Spec. Version SD_SPEC 4 R [59:56]
V1.01
0
data_status_after erases DATA_STAT_AFTER_ERASE 1 R [55:55] 0 0
SD Security Support SD_SECURITY 3 R [54:52]
Prot 2, Spec V1.01
2
DAT Bus widths supported SD_BUS_WIDTHS 4 R [51:48] 1 & 4 5
Reserved - 16 R [47:32] 0 0
Reserved for manufacturer usage - 32 R [31:0] 0 0
SCR_STRUCTURE—Version number of the related SCR structure in the SD Card Physical Layer Specification.
Table 3-24. SCR Register Structure Version
CSD_STRUCTURE CSD Structure Version Valid for SD Physical Layer
Specification Version
0 SCR version No. 1.0 Version 1.0-1.01
1-15 reserved
SD_SPEC—Describes the SD Card Physical Layer Specification version supported by this card.
Table 3-25. SD Card Physical Layer Specification Version
SPEC_VERS Physical Layer
Specification Version Number
0 Version 1.0-1.01
1-15 Reserved
DATA_STAT_AFTER_ERASE—Defines the data status after erase, whether it is ‘0’ or ‘1’ (the status is card
vendor dependent).
SD_SECURITY—Describes the security algorithm supported by the card.