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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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NAND01G-B Datasheet(PDF) 13 Page - STMicroelectronics |
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NAND01G-B Datasheet(HTML) 13 Page - STMicroelectronics |
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13 / 59 page  13/59 NAND512-B, NAND01G-B, NAND02G-B, NAND04G-B, NAND08G-B MEMORY ARRAY ORGANIZATION The memory array is made up of NAND structures where 32 cells are connected in series. The memory array is organized in blocks where each block contains 64 pages. The array is split into two areas, the main area and the spare area. The main area of the array is used to store data whereas the spare area is typically used to store Error correction Codes, software flags or Bad Block identification. In x8 devices the pages are split into a 2048 Byte main area and a spare area of 64 Bytes. In the x16 devices the pages are split into a 1,024 Word main area and a 32 Word spare area. Refer to Figure 8., Memory Array Organization. Bad Blocks The NAND Flash 2112 Byte/ 1056 Word Page de- vices may contain Bad Blocks, that is blocks that contain one or more invalid bits whose reliability is not guaranteed. Additional Bad Blocks may devel- op during the lifetime of the device. The Bad Block Information is written prior to ship- ping (refer to Bad Block Management section for more details). Table 4. shows the minimum number of valid blocks in each device. The values shown include both the Bad Blocks that are present when the de- vice is shipped and the Bad Blocks that could de- velop later on. These blocks need to be managed using Bad Blocks Management, Block Replacement or Error Correction Codes (refer to SOFTWARE ALGO- RITHMS section). Table 4. Valid Blocks Figure 8. Memory Array Organization Density of Device Min Max 8 Gbits 8032 8192 4 Gbits 4016 4096 2 Gbits 2008 2048 1Gbit 1004 1024 512 Mbits 502 512 AI09854 Block = 64 Pages Page = 2112 Bytes (2,048 + 64) 2,048 Bytes 2048 Bytes Spare Area 64 Bytes Block 8 bits 64 Bytes 8 bits Page Page Buffer, 2112 Bytes Block = 64 Pages Page = 1056 Words (1024 + 32) 1,024 Words 1024 Words Spare Area Main Area 32 Words 16 bits 32 Words 16 bits Page Buffer, 1056 Words Block Page x8 DEVICES x16 DEVICES Main Area |
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