SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual download pdf (Page 44)

Industrial Grade SD Card Interface Description

Table 3-19. Multiply Factor For The Device Size

C_SIZE_MULT MULT

0 2

= 4

1 2

= 8

2 2

= 16

3 2

= 32

4 2

= 64

5 2

= 128

6 2

= 256

7 2

= 512

ERASE_BLK_EN—defines whether erase of one write block (see WRITE_BL_LEN) is allowed (other than

SECTOR_SIZE given below). If ERASE_BLK_EN is 0, the host can erase a unit of SECTOR_SIZE. If

ERASE_BLK_EN is 1, the host can erase either a unit of SECTOR_SIZE or a unit of WRITE_BLK_LEN.

SECTOR_SIZE—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 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 Groups (see SECTOR_SIZE). The actual size is computed by increasing this number

by one. A value of zero means 1 erase group, 127 means 128 erase groups.

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. Table 3-20 defines

the field format.

Table 3-20. 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 from 512 up to 2048 bytes. A Write Block Length of 512 bytes is always

supported. In the Industrial Grade SD Card, the WRITE_BL_LEN is always equal to READ_BL_LEN.

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SanDisk SDSDB-32-201-80 - Industrial Grade Flash Memory Card Manual Page 44

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