NAND01GR3B datasheet(29/64 Pages) STMICROELECTRONICS

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NAND01G-B, NAND02G-B

Device operations

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6.4

Copy Back Program

The Copy Back Program operation is used to copy the data stored in one page and

reprogram it in another page.

The Copy Back Program operation does not require 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 updated 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.

To see the Data Input cycle for modifying the source page and an example of the Copy Back

Program operation refer to Figure 12.

A data input cycle to modify a portion or a multiple distant portion of the source page, is

shown in Figure 13

Table 11.

Copy Back Program x8 Addresses

Density

Same Address for Source and Target Pages

1 Gbit

no constraint

2 Gbit

no constraint

2 Gbit DD(1)

DD = Dual Die

A28

Table 12.

Copy Back Program x16 Addresses

Density

Same Address for Source and Target Pages

1 Gbit

no constraint

2 Gbit

no constraint

2 Gbit DD(1)

DD = Dual Die

A27

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