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SMS01GAF 데이터시트(PDF) 11 Page - Numonyx B.V

부품명 SMS01GAF
상세설명  64 MByte, 128 MByte, 256 MByte 512 MByte and 1 GByte, 3.3V Supply Secure Digital??Card
PDF  61 Pages
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제조업체  NUMONYX [Numonyx B.V]
홈페이지  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

SMS01GAF 데이터시트(HTML) 11 Page - Numonyx B.V

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SMSxxxAF, SMSxxxFF, SMSxxxBF
Memory array partitioning
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2
Memory array partitioning
The basic unit of data transfer to/from the SD Memory Card is the Byte. The memory array
is divided into several structures as described below and summarized in Table 17.
Block
The Block is the unit structure related to block-oriented read and write commands. Its size is
the number of Bytes that are transferred when a block-oriented read or write command is
sent by the host. The SD Memory Card Block size is either programmable or fixed. The
information about allowed block sizes and programmability is stored in the CSD Register.
The details of the Memory Array Structure and the number of addressable Blocks are shown
in Table 17.
Sector
The sector is the unit structure related to the erase commands. Its size is the number of
blocks that are erased at any one time. The sector size is fixed for each device. The
information about the sector size (in blocks) is stored in the CSD register.
Write Protect Group (WP-Group)
The WP-Group is the smallest structure that may be individually protected. Its size is the
number of Sectors that are Write Protected with one bit. The information about the Write
Protect Group size is stored in the CSD Register.
Table 7.
Memory array structures
Type of
Structure
Number of structures in device
Unit
32 MByte
Devices
64 MByte
Devices
128 MByte
Devices
256 MByte
Devices
512 MByte
Devices
1 GByte
Devices
Blocks
512 Bytes
59776
122624
248320
499712
1002496
1999872
Sector
Block
128
128
128
128
128
128
WP-Groups
Sector
1
2
4
8
16
32



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