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参数资料
型号： NAND08GR4B3AN6E
厂商： NUMONYX
元件分类： PROM
英文描述： 512M X 16 FLASH 1.8V PROM, 35 ns, PDSO48
封装： 12 X 20 MM, ROHS COMPLIANT, PLASTIC, TSOP-48
文件页数： 31/59页
文件大小： 998K
代理商： NAND08GR4B3AN6E
37/59
NAND512-B, NAND01G-B, NAND02G-B, NAND04G-B, NAND08G-B
Figure 23. Garbage Collection
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 pro-
gram operations it is recommended to implement
a Garbage Collection algorithm. In a Garbage Col-
lection software the valid pages are copied into a
free area and the block containing the invalid pag-
es is erased (see Figure 23.).
Wear-leveling Algorithm
For write-intensive applications, it is recommend-
ed 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 Al-
gorithm 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 min-
imum number of write cycles per block reaches a
specific threshold.
Error Correction Code
An Error Correction Code (ECC) can be imple-
mented in the Nand Flash memories to identify
and correct errors in the data.
For every 2048 bits in the device it is recommend-
ed to implement 22 bits of ECC (16 bits for line par-
ity plus 6 bits for column parity).
An ECC model is available in VHDL or Verilog.
Contact the nearest ST Microelectronics sales of-
fice for more details.
Figure 24. Error Detection
Valid
Page
Invalid
Page
Free
Page
(Erased)
Old Area
AI07599B
New Area (After GC)
New ECC generated
during read
XOR previous ECC
with new ECC
All results
= zero?
22 bit data = 0
YES
11 bit data = 1
NO
1 bit data = 1
Correctable
Error
ECC Error
No Error
ai08332
>1 bit
= zero?
YES
NO
相关PDF资料
PDF描述
NAND128W4A2BN1E 8M X 16 FLASH 3V PROM, 35 ns, PDSO48
NAND256R4A2AN6E 16M X 16 FLASH 1.8V PROM, 12000 ns, PDSO48
NAND256R4A2CV6F 16M X 16 FLASH 1.8V PROM, 12000 ns, PDSO48
NAND256W3A0AN6F 32M X 8 FLASH 3V PROM, 35 ns, PDSO48
NAND512W3A0AN1T 64M X 8 FLASH 3V PROM, 35 ns, PDSO48
相关代理商/技术参数
参数描述
NAND08GW3B2AN6E 功能描述:闪存 4 GBit 2112 Byte 1056 WP 1.8v/3v 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
NAND08GW3B2AN6F 功能描述:闪存 4 GB 2112B 1056 Word Pg 1.8V/3V 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
NAND08GW3B2BN6E 制造商:Micron Technology Inc 功能描述:NAND & S.MEDIA FLASH - Trays
NAND08GW3B2CN6E 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
NAND08GW3B2CN6F 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
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