64-megabit 2.7-volt Only Dual-interface DataFlash AT45DB642

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Figure 2. Algorithm for Randomly Modifying DataSTARTprovide address ofpage to modifyMAIN MEMORY PAGETO BUFFER TRANSFER(53H, 55H)If planning to modify multiplebytes currently stored withina page of the Flash arrayBUFFER WRITE(84H, 87H)MAIN MEMORY PAGE PROGRAMTHROUGH BUFFER(82H, 85H)BUFFER TO MAINMEMORY PAGE PROGRAM(83H, 86H)AUTO PAGE REWRITE (2)(58H, 59H)INCREMENT PAGEADDRESS POINTER (2)ENDNotes: 1. To preserve data integrity, each page of a DataFlash sector must be updated/rewritten at least once within every 10,000cumulative page erase/program operations.2. A Page Address Pointer must be maintained to indicate which page is to be rewritten. The Auto Page Rewrite commandmust 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 10,000cumulative page erase/program operations have accumulated before rewriting all pages of the sector. See application noteAN-4 (“Using Atmel’s Serial DataFlash”) for more details.Sector AddressingPA12 PA11 PA10 PA9 PA8 PA7 PA6 PA5 PA4 PA3 PA2 - PA0 Sector0 0 0 0 0 0 0 0 0 0 X 00 0 0 0 0 X X X X X X 10 0 0 0 1 X X X X X X 20 0 0 1 0 X X X X X X 3• • • • • • • • • • • •• • • • • • • • • • • •• • • • • • • • • • • •1 1 1 0 0 X X X X X X 291 1 1 0 1 X X X X X X 301 1 1 1 0 X X X X X X 311 1 1 1 1 X X X X X X 3234 AT45DB6421638F–DFLSH–09/02
AT45DB642Ordering Informationf SCKI CC (mA)(MHz) Active Standby Ordering Code Package Operation Range20 (1) 10 (1) 0.01 AT45DB642-TC 40T Commercial(0°C to70°C)20 (1) 10 (1) 0.01 AT45DB642-TI 40T Industrial(-40°C to85°C)Note: 1. Serial InterfacePackage Type40T40-lead, Plastic Thin Small Outline Package (TSOP)351638F–DFLSH–09/02
Page 2: However, the use of either interfac
Page 5 and 6: AT45DB642As with the Continuous Arr
Page 7: AT45DB642BUFFER TO MAIN MEMORY PAGE
Page 10 and 11: This gives the DataFlash the abilit
Page 12 and 13: Table 1. Read CommandsCommand SCK/C
Page 14 and 15: Absolute Maximum Ratings*Temperatur
Page 16 and 17: AC Characteristics - Parallel Inter
Page 18 and 19: Reset Timing (Inactive Clock Polari
Page 20 and 21: Read OperationsThe following block
Page 23 and 24: AT45DB642Detailed Bit-level Read Ti
Page 29 and 30: AT45DB642Detailed Parallel Read Tim
Page 31 and 32: AT45DB642Detailed Parallel Read Tim
Page 33: AT45DB642Figure 1. Algorithm for Pr
Page 37: Atmel HeadquartersCorporate Headqua

64-megabit 2.7-volt Only Dual-interface DataFlash AT45DB642

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