NAND08GR3B datasheet(24/59 Pages) STMICROELECTRONICS

24 / 59 page

NAND512-B, NAND01G-B, NAND02G-B, NAND04G-B, NAND08G-B

24/59

Copy Back Program

The Copy Back Program operation is used to copy

the data stored in one page and reprogram it in an-

other page.

The Copy Back Program operation does not re-

quire external memory and so the operation is

faster and more efficient because the reading and

loading cycles are not required. The operation is

particularly useful when a portion of a block is up-

dated and the rest of the block needs to be copied

to the newly assigned block.

If the Copy Back Program operation fails an error

is signalled in the Status Register. However as the

standard external ECC cannot be used with the

Copy Back Program operation bit error due to

charge loss cannot be detected. For this reason it

is recommended to limit the number of Copy Back

Program operations on the same data and or to

improve the performance of the ECC.

The Copy Back Program operation requires four

steps:

The first step reads the source page. The

operation copies all 1056 Words/ 2112 Bytes

from the page into the Data Buffer. It requires:

–

one bus write cycle to setup the command

–

4 bus write cycles to input the source page

address

–

one bus write cycle to issue the confirm

command code

When the device returns to the ready state

(Ready/Busy High), the next bus write cycle of

the command is given with the 4 bus cycles to

input the target page address. Refer to Table

11. for the addresses that must be the same

for the Source and Target pages.

Then the confirm command is issued to start

the P/E/R Controller.

The Data Input cycle for modifying the source

page is performed as shown in Figure 14. After a

Copy Back Program operation, a partial-page pro-

gram is not allowed in the target page until the

block has been erased.

See Figure 14. for an example of the Copy Back

Program operation.

A data input cycle to modify a portion or a multiple

distant portion of the source page, is shown in Fig-

ure 15.

Table 11. Copy Back Program x8 Addresses

Note: 1. DD = Dual Die, QD = Quadruple Die.

Table 12. Copy Back Program x16 Addresses

Note: 1. DD = Dual Die, QD = Quadruple Die.

Density

Same Address for Source and

Target Pages

512 Mbit

no constraint

1 Gbit

no constraint

2 Gbit DD(1)

A28

2 Gbit

no constraint

4 Gbit DD

A29

8 Gbit QD(1)

A29,A30

Density

Same Address for Source and

Target Pages

512 Mbit

no constraint

1 Gbit

no constraint

2 Gbit DD(1)

A27

2 Gbit

no constraint

4 Gbit DD(1)

A28

8 Gbit QD(1)

A28,A29

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