AT45D041-JI ATMEL [ATMEL Corporation], AT45D041-JI Datasheet - Page 15

• Manufacturer Part Number: AT45D041-JI
• Description: 4-Megabit 5-volt Only Serial DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

Notes:
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 com-
mand 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
(82H, 85H)
Algorithm for Randomly Modifying Data
to BUFFER TRANSFER
ADDRESS POINTER
MAIN MEMORY PAGE
Auto Page Rewrite
INCREMENT PAGE
(53H, 55H)
(58H, 59H)
START
END
Figure 2
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
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