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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SMSXXXAF 데이터시트(PDF) 11 Page - Numonyx B.V |
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SMSXXXAF 데이터시트(HTML) 11 Page - Numonyx B.V |
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11 / 61 page  SMSxxxAF, SMSxxxFF, SMSxxxBF Memory array partitioning 11/61 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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