參數(shù)資料
型號(hào)： NAND128W4A2BZA1F
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 8M X 16 FLASH 3V PROM, 35 ns, PBGA55
封裝： 8 X 10 MM, 1 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, VFBGA-55
文件頁(yè)數(shù)： 25/57頁(yè)
文件大小： 916K
代理商： NAND128W4A2BZA1F
31/57
NAND128-A, NAND256-A, NAND512-A, NAND01G-A
Figure 21. 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 21.).
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 Algo-
rithm 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 22. 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
相關(guān)PDF資料
PDF描述
NAND512W3A0AZA1E 64M X 8 FLASH 3V PROM, 35 ns, PBGA63
NAND512W3A2BN1E 64M X 8 FLASH 3V PROM, 35 ns, PDSO48
NAND512W3A0AV1E 64M X 8 FLASH 3V PROM, 35 ns, PDSO48
NAND128R3A0CV6T 16M X 8 FLASH 1.8V PROM, 35 ns, PDSO48
NAND512W4A0AV1F 32M X 16 FLASH 3V PROM, 35 ns, PDSO48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NAND16GAH0HZA5E 制造商:Micron Technology Inc 功能描述:NAND EMMC - Trays
NAND16GAH0HZA5F 制造商:Micron Technology Inc 功能描述:NAND EMMC - Tape and Reel
NAND16GAHAPZO6E 制造商:Micron Technology Inc 功能描述:AUTOMOTIVE - Trays
NAND16GW3B6DPA6E 功能描述:IC FLASH 16GBIT 114LFBGA 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(pán) 其它名稱:497-5040
NAND16GW3B6DPA6F 功能描述:IC FLASH 16GBIT 114LFBGA 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(pán) 其它名稱:497-5040
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*