SanDisk SDSDH-1024 Product Manual - Page 38

Device Size Multiplying Factor

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Revision 2.2 Chapter 3 - SD Card Interface Description SD Card Product Manual Table 3-23 Device Size Multiplying Factor C_SIZE_MULT 0 1 2 3 4 5 6 7 22 = 4 23 = 8 24 = 16 25 = 32 26 = 64 27 = 128 28 = 256 29 = 512 MULT • ERASE_BLK_EN- determines whether erasing one write block (see WRITE_BL_LEN) is allowed (other than SECTOR_SIZE given below). Table 3-24 Bit Definition ERASE_BLK_EN 0 1 Definition Host can erase a SECTOR_SIZE unit. Host can erase either a SECTOR_SIZE unit or a WRITE_BLK_LEN unit. • SECTOR_SIZE-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 "0" denotes 1 write block, 127 denotes 128 blocks. • WP_GRP_SIZE-contents of this register is a 5-bit binary-coded value, defining the number of Erase Groups (see SECTOR_SIZE). The actual size is computed by increasing this number by "1". A value of "0" denotes 1 erase group, and a value of "127" denotes 128 erase groups. • WP_GRP_ENABLE-A value of "0" means group write protection is not possible. • R2W_FACTOR-defines the typical block program time as a multiple of the read access time. Table 3-25 defines the field format. Table 3-25 R2W_FACTOR R2W_FACTOR 0 1 2 3 4 5 6, 7 Multiples of Read Access Time 1 2 (write half as fast as read) 4 8 16 32 Reserved • WRITE_BL_LEN- The maximum write data block length is computed as 2WRITE_BL_LEN. The maximum block length might therefore be in the range 512...2048 bytes. A 512-byte write block length is always supported. In the SD Memory Card, the WRITE_BL_LEN is always equal to READ_BL_LEN. © 2004 SanDisk Corporation 3-18 12/08/04

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Chapter 3 – SD Card Interface Description
Revision 2.2
SD Card Product Manual
© 2004 SanDisk Corporation
3-18
12/08/04
Table 3-23
Device Size Multiplying Factor
C_SIZE_MULT
MULT
0
2
2
= 4
1
2
3
= 8
2
2
4
= 16
3
2
5
= 32
4
2
6
= 64
5
2
7
= 128
6
2
8
= 256
7
2
9
= 512
•
ERASE_BLK_EN
— determines whether erasing one write block (see
WRITE_BL_LEN) is allowed (other than SECTOR_SIZE given below).
Table 3-24
Bit Definition
ERASE_BLK_EN
Definition
0
Host can erase a SECTOR_SIZE unit.
1
Host can erase either a SECTOR_SIZE unit or a WRITE_BLK_LEN
unit.
•
SECTOR_SIZE
—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 “0” denotes 1 write block, 127 denotes 128
blocks.
•
WP_GRP_SIZE
—contents of this register is a 5-bit binary-coded value, defining the
number of Erase Groups (see
SECTOR_SIZE
). The actual size is computed by
increasing this number by “1”. A value of “0” denotes 1 erase group, and a value of
“127” denotes 128 erase groups.
•
WP_GRP_ENABLE
—A value of “0” means group write protection is not possible.
•
R2W_FACTOR
—defines the typical block program time as a multiple of the read
access time. Table 3-25 defines the field format.
Table 3-25
R2W_FACTOR
R2W_FACTOR
Multiples of Read Access Time
0
1
1
2 (write half as fast as read)
2
4
3
8
4
16
5
32
6, 7
Reserved
•
WRITE_BL_LEN
— The maximum write data block length is computed as
2
WRITE_BL_LEN
. The maximum block length might therefore be in the range 512…2048
bytes.
A 512-byte write block length is always supported.
In the SD Memory Card,
the WRITE_BL_LEN is always equal to READ_BL_LEN.