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参数资料
| 型号： | NAND256W3A0AN6F |
| 厂商： | NUMONYX |
| 元件分类： | PROM |
| 英文描述： | 32M X 8 FLASH 3V PROM, 35 ns, PDSO48 |
| 封装： | 12 X 20 MM, ROHS COMPLIANT, PLASTIC, TSOP-48 |
| 文件页数： | 27/58页 |
| 文件大小： | 1406K |
| 代理商： | NAND256W3A0AN6F |
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NAND128-A, NAND256-A
Software algorithms
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7.3
Garbage collection
When a data page needs to be modified, it is faster to write to the first available page, and
the previous page is marked as invalid. After several updates it is necessary to remove
invalid pages to free some memory space.
To free this memory space and allow further program operations it is recommended to
implement a garbage collection algorithm. In a garbage collection software the valid pages
are copied into a free area and the block containing the invalid pages is erased (see
Figure 18.
Garbage collection
7.4
Wear-leveling algorithm
For write-intensive applications, it is recommended to implement a wear-leveling algorithm
to monitor and spread the number of write cycles per block.
In memories that do not use a wear-leveling algorithm not all blocks get used at the same
rate. Blocks with long-lived data do not endure as many write cycles as the blocks with
frequently-changed data.
The wear-leveling algorithm ensures that equal use is made of all the available write cycles
for each block. There are two wear-leveling levels:
●
First level wear-leveling: new data is programmed to the free blocks that have had the
fewest write cycles.
●
Second level wear-leveling: long-lived data is copied to another block so that the
original block can be used for more frequently-changed data.
The second level wear-leveling is triggered when the difference between the maximum and
the minimum number of write cycles per block reaches a specific threshold.
Valid
Page
Invalid
Page
Free
Page
(Erased)
Old Area
AI07599B
New Area (After GC)
相关PDF资料 |
PDF描述 |
|---|---|
| NAND512W3A0AN1T | 64M X 8 FLASH 3V PROM, 35 ns, PDSO48 |
| NAND512W3A0AN6T | 64M X 8 FLASH 3V PROM, 35 ns, PDSO48 |
| NAND512W3A0BZB1E | 64M X 8 FLASH 3V PROM, 35 ns, PBGA55 |
| NAND512W3A2AZB1E | 64M X 8 FLASH 3V PROM, 35 ns, PBGA55 |
| NAND01GW3A3AZA1T | 128M X 8 FLASH 3V PROM, 12000 ns, PBGA63 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NAND256W3A0AZA6E | 制造商:Micron Technology Inc 功能描述:FLASH PARALLEL 2.7V TO 3.6V 256MBIT 32MX8 12US 55VFBGA - Trays |
| NAND256W3A0AZA6F | 制造商:Micron Technology Inc 功能描述:FLASH PARALLEL 2.7V TO 3.6V 256MBIT 32MX8 12US 55VFBGA - Tape and Reel |
| NAND256W3A0BE06 | 功能描述:闪存 NAND & S.MEDIA FLASH RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel |
| NAND256W3A0BN6E | 制造商:Micron Technology Inc 功能描述:NAND - Trays |
| NAND256W3A0BN6F | 制造商:Micron Technology Inc 功能描述:NAND - Tape and Reel |
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