K9F2G08B0B データシートの表示（PDF） - Samsung

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コンポーネント説明

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K9F2G08B0B

256M x 8 Bit NAND Flash Memory

Samsung 

K9F2G08B0B

K9F2G08U0B

Preliminary

FLASH MEMORY

NAND Flash Technical Notes

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 tran-

sistor. 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/512Byte ECC.

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 ini-

tial 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 prohibited.

Start

Set Block Address = 0

Increment Block Address

Create (or update)

No

Initial

Invalid Block(s) Table

No

* Check "FFh" at the column address 2048

of the 1st and 2nd page in the block

Check "FFh"

Yes

Last Block ?

Yes

End

Figure 3. Flow chart to create initial invalid block table

Samsung Confidential

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