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S34ML01G204THB000

Spansion® SLC NAND Flash Memory for Embedded

Spansion Inc. 

Data Sheet

3.7

Copy Back Program

The copy back feature is intended 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 performance is greatly improved. The benefit is especially obvious when a portion of a block needs to

be updated and the rest of the block also needs to be copied to the newly assigned free block. The operation

for performing a copy back is a sequential execution of page-read (without mandatory serial access) and

Copy Back Program with the address of destination page. A read operation with the ‘35h’ command and the

address of the source page moves the whole page of data into the internal data register. As soon as the

device returns to the Ready state, optional data read-out is allowed by toggling RE# (see Figure 6.18

on page 54), or the Copy Back Program command (85h) with the address cycles of the destination page may

be written. The Program Confirm command (10h) is required to actually begin programming.

The source and the destination pages in the Copy Back Program sequence must belong to the same device

plane (same PLA0 for S34ML02G2 and S34ML04G2). Copy Back Read and Copy Back Program for a given

plane must be between odd address pages or between even address pages for the device to meet the

program time (tPROG) specification. Copy Back Program may not meet this specification when copying 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).

The data input cycle for modifying a portion or multiple distinct portions of the source page is allowed as

shown in Figure 6.19 on page 54.

If a Copy Back Program operation is interrupted by hardware reset, power failure or other means, the host

must ensure that the interrupted page is not used for further reading or programming operations until the next

uninterrupted block erase is complete.

3.7.1

Multiplane Copy Back Program — S34ML02G2 and S34ML04G2

The device supports Multiplane Copy Back Program with exactly the same sequence and limitations as the

Page Program. Multiplane Copy Back Program must be preceded by two single page Copy Back Read

command sequences (1st page must be read from the 1st plane and 2nd page from the 2nd plane).

Multiplane Copy Back cannot cross plane boundaries — the contents of the source page of one device plane

can be copied only to a destination page of the same plane.

The Multiplane Copy Back Program sequence represented in Figure 6.20 on page 55 shows the legacy

protocol. In this case, the block address bits for the first plane are all zero and the second address issued

selects the block for both planes. Figure 6.21 on page 56 describes the sequence using the ONFI protocol.

For both addresses issued in this protocol, the block address bits must be the same except for the bit(s) that

select the plane.

If a Multiplane Copy Back Program operation is interrupted by hardware reset, power failure or other means,

the host must ensure that the interrupted pages are not used for further reading or programming operations

until the next uninterrupted block erases are complete for the applicable blocks.

3.7.2

Special Read for Copy Back — S34ML02G2 and S34ML04G2

The S34ML02G2 and S34ML04G2 devices support Special Read for Copy Back. If Copy Back Read

(described in Section 3.7 and Section 3.7.1 on page 27) is triggered with confirm command ‘36h’ instead

‘35h’, Copy Back Read from target page(s) will be executed with an increased internal (VPASS) voltage.

This special feature is used in order to minimize the number of read errors due to over-program or read

disturb — it shall be used only if ECC read errors have occurred in the source page using Page Read or Copy

Back Read sequences.

Excluding the Copy Back Read confirm command, all other features described in Section 3.7 and

Section 3.7.1 for standard copy back remain valid (including the figures referred to in those sections).

September 5, 2014 S34ML01G2_04G2_10

Spansion® SLC NAND Flash Memory for Embedded

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