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參數(shù)資料
| 型號(hào)： | NAND512R3A2CV6E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | PROM |
| 英文描述： | 64M X 8 FLASH 1.8V PROM, 15000 ns, PDSO48 |
| 封裝： | 12 X 17 MM, 0.65 MM HEIGHT, ROHS COMPLIANT, PLASTIC, USOP-48 |
| 文件頁數(shù)： | 24/56頁 |
| 文件大?。?/td> | 951K |
| 代理商： | NAND512R3A2CV6E |
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NAND128-A, NAND256-A, NAND512-A, NAND01G-A
30/56
Figure 19. 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 19.).
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 20. 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
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| NAND128R4A2BZA6E | 8M X 16 FLASH 1.8V PROM, 35 ns, PBGA55 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NAND512R3A2CZA6E | 功能描述:IC FLASH 512MBIT 63VFBGA RoHS:是 類別:集成電路 (IC) >> 存儲(chǔ)器 系列:- 產(chǎn)品變化通告:Product Discontinuation 26/Apr/2010 標(biāo)準(zhǔn)包裝:136 系列:- 格式 - 存儲(chǔ)器:RAM 存儲(chǔ)器類型:SRAM - 同步，DDR II 存儲(chǔ)容量:18M（1M x 18） 速度:200MHz 接口:并聯(lián) 電源電壓:1.7 V ~ 1.9 V 工作溫度:0°C ~ 70°C 封裝/外殼:165-TBGA 供應(yīng)商設(shè)備封裝:165-CABGA（13x15） 包裝:托盤 其它名稱:71P71804S200BQ |
| NAND512R3A2CZA6F | 制造商:Micron Technology Inc 功能描述:SLC NAND Flash Parallel 1.8V 512Mbit 64M x 8bit 15us 63-Pin VFBGA T/R |
| NAND512R3A2DDI6 | 制造商:Micron Technology Inc 功能描述:NAND - Gel-pak, waffle pack, wafer, diced wafer on film |
| NAND512R3A2DZA6E | 功能描述:IC FLASH 512MBIT 63VFBGA RoHS:是 類別:集成電路 (IC) >> 存儲(chǔ)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 格式 - 存儲(chǔ)器:EEPROMs - 串行 存儲(chǔ)器類型:EEPROM 存儲(chǔ)容量:4K (512 x 8) 速度:400kHz 接口:I²C，2 線串口 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-MFP 包裝:帶卷 (TR) |
| NAND512R3A2SE06 | 制造商:Micron Technology Inc 功能描述:NAND - Gel-pak, waffle pack, wafer, diced wafer on film |
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