NAND01G-B2C datasheet(29/67 Pages) NUMONYX

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NAND01G-B2C

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 by the pass/fail status.

However, if copy back operations are accumulated over time, a bit error due to charge loss is

not checked by an external error detection/correction scheme. For this reason it is

recommended to use a 2-bit error correction in a copy back operation.

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 (see Table 6 and Table 7)

–

one bus write cycle to issue the confirm command code

When the device returns to the ready state (Ready/Busy High), the user may read the

contents of the source page by toggling R. In this case, random data output is also

allowed. To proceed with the copy back of the page into the target location, the user will

issue 85h followed by 4 bus cycles to input the target page address (see Table 6 and

Table 7).

Then the confirm command is issued to start the P/E/R controller.

For an example of the copy back program operation, refer to Figure 13, while Figure 14

shows an example of Copy Back Program with Random Data Input.

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

shown in Figure 14.

Figure 13.

Copy back program

I/O

Source

Add Inputs

ai09858b

85h

Copy Back

Code

Read

Code

Read Status Register

Target

Add Inputs

tBLBH1

(Read Busy time)

Busy

tBLBH2

(Program Busy time)

00h

10h

70h

SR0

Busy

35h

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