參數(shù)資料
型號(hào)： NAND02GW4B2CZA1E
廠商： NUMONYX
元件分類： PROM
英文描述： 128M X 16 FLASH 3V PROM, 25000 ns, PBGA63
封裝： 9.50 X 12 MM, 1 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, VFBGA-63
文件頁(yè)數(shù)： 31/60頁(yè)
文件大?。?/td> 1335K
代理商： NAND02GW4B2CZA1E
NAND01G-B2B, NAND02G-B2C
Software algorithms
37/60
8.3
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
8.4
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.
8.5
Error correction code
An error correction code (ECC) can be implemented in the NAND flash memories to identify
and correct errors in the data.
For every 2048 bits in the device it is recommended to implement 22 bits of ECC (16 bits for
line parity plus 6 bits for column parity).
An ECC model is available in VHDL or Verilog. Contact the nearest Numonyx sales office for
more details.
相關(guān)PDF資料
PDF描述
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NB2762ASNR2G HF - EMI REDUCER; Package: TSOP-6; No of Pins: 6; Container: Tape and Reel; Qty per Container: 2500
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NAND04GR3B2DDI6 制造商:Micron Technology Inc 功能描述:NAND - Gel-pak, waffle pack, wafer, diced wafer on film
NAND04GR3B2DN6E 功能描述:IC FLASH 4GBIT 48TSOP RoHS:是 類別:集成電路 (IC) >> 存儲(chǔ)器 系列:- 標(biāo)準(zhǔn)包裝:576 系列:- 格式 - 存儲(chǔ)器:閃存 存儲(chǔ)器類型:閃存 - NAND 存儲(chǔ)容量:512M（64M x 8） 速度:- 接口:并聯(lián) 電源電壓:2.7 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 封裝/外殼:48-TFSOP（0.724"，18.40mm 寬） 供應(yīng)商設(shè)備封裝:48-TSOP 包裝:托盤 其它名稱:497-5040
NAND04GR3B2DZL6F 制造商:Micron Technology Inc 功能描述:NAND - Tape and Reel
NAND04GR3B2EN6E 制造商:Micron Technology Inc 功能描述:NAND - Trays
NAND04GR3B2EN6F 制造商:Micron Technology Inc 功能描述:NAND - Tape and Reel
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