T
T
T
S
S
S
2
2
2
G
G
G
U
U
U
S
S
S
D
D
D
-
-
-
P
P
P
3
3
3
2GB microSD Card + Reader P3
Transcend Information Inc.
15
The size of an erasable sector. The contents of this register is a 7 bit binary coded value, defining the number of write
blocks (see WRITE_BL_LEN). The actual size is computed by increasing this number by one. A value of zero means
1 write block, 127 means 128 write blocks.
•
WP_GRP_SIZE
The size of a write protected group. The contents of this register is a 7 bit binary coded value, defining the number of
erase sectors (see SECTOR_SIZE). The actual size is computed by increasing this number by one. A value of zero
means 1 erase sector, 127 means 128 erase sectors.
•
WP_GRP_ENABLE
A value of ‘0’ means no group write protection possible.
•
R2W_FACTOR
Defines the typical block program time as a multiple of the read access time. The following table defines the field
format.
•
WRITE_BL_LEN
The maximum write data block length is computed as 2
WRITE_BL_LEN
. The maximum block lengthmight therefore be in
the range from 512 up to 2048 bytes. Write Block Length of 512 bytes isalways supported.
Note that in SD Memory Card the WRITE_BL_LEN is always equal to READ_BL_LEN.
