NM1482KSLAXCL datasheet(57/121 Pages) NANYA

57 / 121 page

Version 1.6

Nanya Technology Corp.

05/2018

4Gb SLC NAND + 2Gb LPDDR2

NM148(F)2KSLAXCL/NM1482NSLAXCL

NTC Proprietary

Level: Property

(14)Invalid blocks (bad blocks)

The device occasionally contains unusable blocks. Therefore, the following issues must be recognized:

The number of valid blocks over the device lifetime is as follows:

Symbol

Min

Typ.

Max

Unit

Valid(Good) Block Number

2,008

－

2,048

Blocks

Bad Block Test Flow

Regarding invalid blocks, bad block mark is in whole pages.

Please read one column of any page in each block. It makes sure that every

invalid block has Majority “0” data

at this column. If the data of the column is Majority “0”, define the block as a bad block.

Note1: No erase operation is allowed to detected bad blocks.

Pass

Start

Block No = 1

Read Check

Last Block

End

Block No. = Block No. + 1

Bad Block1

Yes

Fail

Please do not perform an erase operation to bad blocks. It may be impossible to recover

the bad block information if the information is erased.

Check if the device has any bad blocks after installation into the system.

Refer to the test flow for bad block detection. Bad blocks which are detected by the test

flow must be managed as unusable blocks by the system.

A bad block does not affect the performance of good blocks because it is isolated from

the bit lines by select gates.

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