Scr Register - SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Product Manual

COPY—This bit marks the card as an original ('0') or non-original ('1'). Once set to non-original, this bit cannot
be reset to original. The definition of "original" and "non-original" is application dependent and changes no card
characteristics.
PERM_WRITE_PROTECT—Permanently protects the whole card content, except the secured protected area,
against overwriting or erasing (all write and erase commands for this card are permanently disabled). The default
value is '0', i.e., not permanently write protected.
TMP_WRITE_PROTECT—Temporarily protects the whole card content, except the secured protected area, from
being overwritten or erased (all write and erase commands for this card are temporarily disabled). This bit can be set
and reset. The default value is '0', i.e., not write protected.
FILE_FORMAT—Indicates the file format on the card. This field is read-only for ROM. The following formats
are defined.
FILE_FORMAT_GRP FILE_FORMAT
0
0
0
0
1
CRC—The CRC field carries the check sum for the CSD contents. The checksum has to be recalculated by the host
for any CSD modification. The default corresponds to the initial CSD contents.

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 SD Card's 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.
Description
SCR Structure
SD Card—Spec. Version
data_status_after erases
SD Security Support
DAT Bus widths supported
Reserved
Reserved for manufacturer usage
SCR_STRUCTURE—Version number of the related SCR structure in the SD Card Physical Layer Specification.
SanDisk Secure Digital (SD) Card Product Manual, Rev. 1.9 © 2003 SANDISK CORPORATION
Table 3-22. File Format
0 Hard disk-like file system with partition table
1 DOS FAT (floppy-like) with boot sector only (no partition table)
2 Universal File Format
3 Others/Unknown
0, 1, 2, 3 Reserved
Table 3-23. SCR Fields
Field
SCR_STRUCTURE
SD_SPEC
DATA_STAT_AFTER_ERASE
SD_SECURITY
SD_BUS_WIDTHS
-
-
Type
Width Cell Type SCR Slice
4 R [63:60]
4 R [59:56]
1 R [55:55]
3 R [54:52]
4 R [51:48]
16 R [47:32]
32 R [31:0]
SD Card Interface Description
SCR Value SCR Code
V1.0 0
V1.01 0
0 0
Prot 2, Spec V1.01 2
1 & 4 5
0 0
0 0
3-19