AT45DB321D-CCU Adesto Technologies, AT45DB321D-CCU Datasheet - Page 42

• Manufacturer Part Number: AT45DB321D-CCU
• Description: Flash 32M 2.7-3.6V, 66Mhz Serial Flash
• Manufacturer: Adesto Technologies

Specifications of AT45DB321D-CCU

• Rohs: yes
• Data Bus Width: 8 bit
• Memory Type: Data Flash
• Memory Size: 32 Mbit
• Architecture: Flexible, Uniform Erase
• Timing Type: Synchronous
• Interface Type: SPI
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Current: 15 mA
• Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: BGA-24
• Factory Pack Quantity: 378

Figure 23-2. Algorithm for Randomly Modifying Data
Notes:
1.
2.
3.
Main Memory Page Program
To preserve data integrity, each page of an DataFlash sector must be updated/rewritten at least once within every
20,000 cumulative page erase and 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 20,000 cumulative page erase and program operations have accumulated before rewriting all pages of the
sector. See application note AN-4 (“Using Serial DataFlash”) for more details.
through Buffer
(82h, 85h)
Auto Page Rewrite
Main Memory Page
Address Pointer
to Buffer Transfer
Increment Page
(53h, 55h)
(58h, 59h)
START
END
provide address of
page to modify
(2)
(2)
Memory Page Program
Buffer to Main
Buffer Write
(84h, 87h)
(83h, 86h)
If planning to modify multiple
bytes currently stored within
a page of the Flash array
AT45DB321D [DATASHEET]
3597R–DFLASH–11/2012
42