SanDisk SD032 Manual descarregar pdf (Página 43)

READ_BL_LEN—The maximum read data block length is computed as 2

READ_BL_LEN

. The maximum block length

might therefore be in the range 512...2048 bytes. Note that in the miniSD Card, the WRITE_BL_LEN is always

equal to READ_BL_LEN.

Table 3-14. Data Block Length

READ_BL_LEN Block Length

0-8 Reserved

9 2

= 512 Bytes

......

11 2

= 2048 Bytes

12-15 Reserved

READ_BL_PARTIAL— READ_BL_PARTIAL is always set to 1 in the miniSD Card. Partial Block Read is

always allowed in the miniSD Card. It means that smaller blocks can be used as well. The minimum block size is

one byte.

READ_BL_PARTIAL=0 means that only the READ_BL_LEN block size can be used for block oriented data

transfers.

READ_BL_PARTIAL=1 means that smaller blocks can be used as well. The minimum block size will be equal to

minimum addressable unit (one byte)

WRITE_BLK_MISALIGN—Defines if the data block to be written by one command can be spread over more

than one physical block of the memory device. The size of the memory block is defined in WRITE_BL_LEN.

WRITE_BLK_MISALIGN=0 signals that crossing physical block boundaries is invalid.

WRITE_BLK_MISALIGN=1 signals that crossing physical block boundaries is allowed.

READ_BLK_MISALIGN—Defines if the data block to be read by one command can be spread over more than

one physical block of the memory device. The size of the memory block is defined in READ_BL_LEN.

READ_BLK_MISALIGN=0 signals that crossing physical block boundaries is invalid.

READ_BLK_MISALIGN=1 signals that crossing physical block boundaries is allowed.

DSR_IMP—Defines if the configurable driver stage is integrated on the card. If set, a driver stage register (DSR)

must be implemented also.

Table 3-15. DSR Implementation Code Table

DSR_IMP DSR Type

0 no DSR implemented

1 DSR implemented

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 113 114

Sem comentários

SanDisk SD032 Manual Página 43