at45db011 ATMEL Corporation, at45db011 Datasheet - Page 17

• Manufacturer Part Number: at45db011
• Description: 1-megabit 2.7-volt Only Serial Dataflash
• Manufacturer: ATMEL Corporation

Figure 2. Algorithm for Randomly Modifying Data
Notes:
Sector Addressing
PA8
0
0
1
1. To preserve data integrity, each page of a DataFlash sector must be updated/rewritten at least once within every 10,000
2. A Page Address Pointer must be maintained to indicate which page is to be rewritten. The Auto Page Rewrite command
3. 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 within that sector.
must use the address specified by the Page Address Pointer.
cumulative page erase/program operations have accumulated before rewriting all pages of the sector. See application note
AN-4 (“Using Atmel’s Serial DataFlash”) for more details.
PA7
X
X
0
MAIN MEMORY PAGE PROGRAM
PA6
X
X
0
(82H)
PA5
to BUFFER TRANSFER
ADDRESS POINTER
MAIN MEMORY PAGE
X
X
Auto Page Rewrite
0
INCREMENT PAGE
START
(53H)
(58H)
END
provide address of
page to modify
PA4
MEMORY PAGE PROGRAM
(2)
0
X
X
(2)
BUFFER to MAIN
BUFFER WRITE
(84H)
(83H)
PA3
If planning to modify multiple
bytes currently stored within
a page of the Flash array
X
X
0
PA2-PA0
X
X
X
Sector
0
1
2
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