HY27UG088G5M Datasheet, PDF (15/50 Pages) Hynix Semiconductor – 8Gbit (1Gx8bit) NAND Flash

HY27UG088G(5/D)M Series
8Gbit (1Gx8bit) NAND Flash
3.4 Copy-Back Program.
The copy-back program is configured to quickly and efficiently rewrite data stored in one page without utilizing an
external memory. Since the time-consuming cycles of serial access and re-loading cycles are removed, the system per-
formance is improved. The benefit is especially obvious when a portion of a block is updated and the rest of the block
also need to be copied to the newly assigned free block. The operation for performing a copy-back program is a
sequential execution of page-read without serial access and copying-program with the address of destination page. A
read operation with "35h" command and the address of the source page moves the whole 2112byte (X8 device) data
into the internal data buffer. As soon as the device returns to Ready state, Copy Back command (85h) with the address
cycles of destination page may be written. The Program Confirm command (10h) is required to actually begin the pro-
gramming operation. Data input cycle for modifying a portion or multiple distant portions of the source page is allowed
as shown in Figure 16.
"When there is a program-failure at Copy-Back operation, error is reported by pass/fail status. But, if
Copy-Back operations are accumulated over time, bit error due to charge loss is not checked by external
error detection/correction scheme. For this reason, two bit error correction is recommended for the use
of Copy-Back operation."
Figure 16 shows the command sequence for the copy-back operation.
The Copy Back Program operation requires three steps:
1. The source page must be read using the Read A command (one bus write cycle to setup the command and then
5 bus write cycles to input the source page address). This operation copies all 2KBytes from the page into the Page
Buffer.
2. When the device returns to the ready state (Ready/Busy High), the second bus write cycle of the command is
given with the 5bus cycles to input the target page address. A29 must be the same for the Source and Target Pages.
3. Then the confirm command is issued to start the P/E/R Controller.
NOTE:
1. Copy-Back Program operation is allowed only within the same memory plane.
2. On the same plane, It’s prohibited to operate copy-back program from an odd address page (source page) to an
even address page (target page) or from an even address page (source page) to an odd address page (target page).
Therefore, the copy-back program is permitted just between odd address pages or even address pages.
Rev. 0.6 / Dec. 2006
15