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K9F1G08U0E Scheda tecnica(PDF) 15 Page - Samsung semiconductor

Il numero della parte K9F1G08U0E
Spiegazioni elettronici  1Gb E-die NAND Flash
Download  38 Pages
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Produttore elettronici  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

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K9F1G08U0E
FLASH MEMORY
Rev. 1.11
SAMSUNG CONFIDENTIAL
3.0 NAND FLASH TECHNICAL NOTES
3.1 Initial Invalid Block(s)
Initial invalid blocks are defined as blocks that contain one or more initial invalid bits whose reliability is not guaranteed by Samsung. The information
regarding the initial invalid block(s) is called the initial invalid block information. Devices with initial invalid block(s) have the same quality level as devices
with all valid blocks and have the same AC and DC characteristics. An initial invalid block(s) does not affect the performance of valid block(s) because it
is isolated from the bit line and the common source line by a select transistor. The system design must be able to mask out the initial invalid block(s) via
address mapping. The 1st block, which is placed on 00h block address, is guaranteed to be a valid block up to 1K program/erase cycles with 1bit/528Byte
ECC.
3.2 Identifying Initial Invalid Block(s)
All device locations are erased(FFh) except locations where the initial invalid block(s) information is written prior to shipping. The initial invalid block(s)
status is defined by the 1st byte in the spare area. Samsung makes sure that either the 1st or 2nd page of every initial invalid block has non-FFh data at
the column address of 2048. Since the initial invalid block information is also erasable in most cases, it is impossible to recover the information once it has
been erased. Therefore, the system must be able to recognize the initial invalid block(s) based on the original initial invalid block information and create
the initial invalid block table via the following suggested flow chart(Figure 3). Any intentional erasure of the original initial invalid block information is pro-
hibited.
[Figure 3] Flow chart to create initial invalid block table
*
Check "FFh" at the column address 2048
Start
Set Block Address = 0
Check "FFh"
Increment Block Address
Last Block ?
End
No
Yes
Yes
Create (or update)
No
Initial
of the 1st and 2nd page in the block
Invalid Block(s) Table


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