S34ML01G2 datasheet(21/76 Pages) CYPRESS

21 / 76 page

S34ML01G2

S34ML02G2

S34ML04G2

Document Number: 002-00499 Rev. *N

Page 21 of 76

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 49), 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 49.

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 50 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 51 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 21) 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).

S34ML01G2 Datasheet(PDF) 21 Page - Cypress Semiconductor

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