AT45DB041-CC ATMEL [ATMEL Corporation], AT45DB041-CC Datasheet - Page 16

• Manufacturer Part Number: AT45DB041-CC
• Description: 4-Megabit 2.7-volt Only Serial DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 2. Algorithm for Randomly Modifying Data
Notes:
16
1.
2.
3.
To preserve data integrity, each page of the DataFlash memory array must be updated/rewritten at least once within every
10,000 cumulative page erase/program operations.
A Page Address Pointer must be maintained to indicate which page is to be rewritten. The Auto Page Rewrite command
must use the address specified by the Page Address Pointer.
Other algorithms can be used to rewrite portions of the Flash array. Low power applications may choose to wait until 10,000
cumulative page erase/program operations have accumulated before rewriting all pages of the Flash array. See application
note AN-4 (“Using Atmel’s Serial DataFlash”) for more details.
MAIN MEMORY PAGE PROGRAM
AT45DB041
(82H, 85H)
to BUFFER TRANSFER
ADDRESS POINTER
MAIN MEMORY PAGE
Auto Page Rewrite
INCREMENT PAGE
(53H, 55H)
(58H, 59H)
START
END
provide address of
page to modify
MEMORY PAGE PROGRAM
(2)
(2)
BUFFER to MAIN
BUFFER WRITE
(84H, 87H)
(83H, 86H)
If planning to modify multiple
bytes currently stored within
a page of the Flash array