K9LAG08U0M-P データシートの表示（PDF） - Samsung

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K9LAG08U0M-P

2G x 8 Bit / 4G x 8 Bit NAND Flash Memory

Samsung 

K9HBG08U1M

K9LAG08U0M K9MCG08U5M

Advance

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 fully guaranteed to be a valid block.

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 the last page of every initial invalid

block has non-FFh data at the column address of 2,048.The initial invalid block information is also erasable in most cases, and 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 initial invalid block information and create the initial invalid block table via the following suggested flow

chart(Figure 3). Any intentional erasure of the initial invalid block information is prohibited.

Start

Set Block Address = 0

Increment Block Address

* Check "FFh" at the column address

2048 of the last page in the block

Create (or update)

Initial

No

Check "FFh" ?

Invalid Block(s) Table

Yes

No

Last Block ?

Yes

End

Figure 3. Flow chart to create initial invalid block table.

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