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AT45DB081B-CC-2.5 Datasheet(PDF) 27 Page - ATMEL Corporation |
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AT45DB081B-CC-2.5 Datasheet(HTML) 27 Page - ATMEL Corporation |
27 / 33 page 27 AT45DB081B 2225I–DFLSH–9/05 Figure 2. Algorithm for Randomly Modifying Data Notes: 1. To preserve data integrity, each page of a DataFlash sector must be updated/rewritten at least once within every 10,000 cumulative page erase/program operations. 2. 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. 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 have accumulated before rewriting all pages of the sector. See application note AN-4 (“Using Atmel’s Serial DataFlash”) for more details. Sector Addressing PA11 PA10 PA9 PA8 PA7 PA6 PA5 PA4 PA3 PA2 - PA0 Sector 000000000 X 0 0000 XXXXXX 1 0001 XXXXXX 2 0 0 1 XXXXXXX 3 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1 0 0 XXXXXXX 6 1 0 1 XXXXXXX 7 1 1 0 XXXXXXX 8 1 1 1 XXXXXXX 9 START MAIN MEMORY PAGE TO BUFFER TRANSFER (53H, 55H) INCREMENT PAGE ADDRESS POINTER (2) AUTO PAGE REWRITE (2) (58H, 59H) END provide address of page to modify If planning to modify multiple bytes currently stored within a page of the Flash array MAIN MEMORY PAGE PROGRAM THROUGH BUFFER (82H, 85H) BUFFER WRITE (84H, 87H) BUFFER TO MAIN MEMORY PAGE PROGRAM (83H, 86H) |
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