User Manual

TriFlash Interface Description
3-20 TriFlash with SD Interface Product Manual (Preliminary), Rev. 1.2 © 2002/2003 SANDISK CORPORATION
Table 3-21. Data Block Length
WRITE_BL_LEN Block Length
0-8 Reserved
9 29 = 512 Bytes
….
11 211 = 2048 Bytes
12-15 Reserved
WRITE_BL_PARTIAL—Defines whether partial block sizes can be used in block write commands.
WRITE_BL_PARTIAL=‘0’ means that only the WRITE_BL_LEN block size, and its partial derivatives in
resolution of units of 512 blocks, can be used for block oriented data write.
WRITE_BL_PARTIAL=‘1’ means that smaller blocks can be used as well. The minimum block size is one byte.
FILE_FORMAT_GROUP—Indicates the selected group of file formats. This field is read-only for ROM. The
usage of this field is shown in Table 3-22.
COPY—This bit marks the device 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 device
characteristics.
PERM_WRITE_PROTECT—Permanently protects the whole device content, except the secured protected area,
against overwriting or erasing (all write and erase commands for this device are permanently disabled). The default
value is ‘0’, i.e., not permanently write protected.
TMP_WRITE_PROTECT—Temporarily protects the whole device content, except the secured protected area,
from being overwritten or erased (all write and erase commands for this device 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 device. This field is read-only for ROM. The following formats
are defined.
Table 3-22. FILE_FORMAT
FILE_FORMAT_GRP FILE_FORMAT Type
0 0 Hard disk-like file system with partition table
0 1 DOS FAT (floppy-like) with boot sector only (no partition table)
0 2 Universal File Format
0 3 Others/Unknown
1 0, 1, 2, 3 Reserved
CRC—The CRC field carries the checksum 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.