AT45DB321B-CI Atmel, AT45DB321B-CI Datasheet - Page 27

• Manufacturer Part Number: AT45DB321B-CI
• Description: IC FLASH 32MBIT 20MHZ 44CBGA
• Manufacturer: Atmel

Specifications of AT45DB321B-CI

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 32M (8192 pages x 528 bytes)
• Speed: 20MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-CBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 2. Algorithm for Randomly Modifying Data
Notes:
Sector Addressing
2223E–DFLASH–11//03
PA12
0
0
0
0
1
1
1
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.
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.
PA11
0
0
0
0
1
1
1
1
•
•
•
PA10
0
0
0
1
0
0
1
1
•
•
•
MAIN MEMORY PAGE PROGRAM
THROUGH BUFFER
(82H, 85H)
PA9
0
0
1
0
0
1
0
1
•
•
•
PA8
AUTO PAGE REWRITE
TO BUFFER TRANSFER
ADDRESS POINTER
MAIN MEMORY PAGE
X
X
X
X
X
X
X
0
•
•
•
INCREMENT PAGE
(53H, 55H)
(58H, 59H)
START
END
provide address of
PA7
page to modify
0
X
X
X
X
X
X
X
•
•
•
MEMORY PAGE PROGRAM
(2)
(2)
BUFFER TO MAIN
BUFFER WRITE
(84H, 87H)
(83H, 86H)
PA6
X
X
X
X
X
X
X
0
•
•
•
If planning to modify multiple
bytes currently stored within
a page of the Flash array
PA5
X
X
X
X
X
X
X
0
•
•
•
PA4
X
X
X
X
X
X
X
0
•
•
•
AT45DB321B
PA3
X
X
X
X
X
X
X
0
•
•
•
Sector
13
14
15
16
0
1
2
3
•
•
•
27