NAND128-A, NAND256-A, NAND512-A, NAND01G-A
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 operation bit error due to charge loss
cannot be detected. For this reason it is recom-
mended to limit the number of Copy Back opera-
tions on the same data and or to improve the
performance of the ECC.
2. When the device returns to the ready state
(Ready/Busy High), the second bus write
cycle of the command is given with the 4 bus
cycles to input the target page address. Refer
to Table 10. for the addresses that must be the
same for the Source and Target pages.
3. Then the confirm command is issued to start
the P/E/R Controller.
After a Copy Back Program operation, a partial-
page program is not allowed in the target page un-
til the block has been erased.
See Figure 18. for an example of the Copy Back
operation.
Table 10. Copy Back Program Addresses
Same Address for Source and
Density
Target Pages
The Copy Back Program operation requires three
steps:
128 Mbit
256 Mbit
512 Mbit
A23
A24
A25
1. The source page must be read using the Read
A command (one bus write cycle to setup the
command and then 4 bus write cycles to input
the source page address). This operation
copies all 264 Words/ 528 Bytes from the page
into the Page Buffer.
(1)
A24, A25
A25, A26
512 Mbit DD
(1)
1 Gbit DD
Note: 1. DD = Dual Die.
Figure 18. Copy Back Operation
tBLBH1
tBLBH2
(Read Busy time)
(Program Busy time)
RB
Busy
Source
Target
Address Inputs
I/O
00h
8Ah
10h
70h
SR0
Address Inputs
Read
Code
Copy Back
Code
Read Status Register
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STMICROELECTRONICS [ ST ]
