at45db021b ATMEL Corporation, at45db021b Datasheet - Page 3

• Manufacturer Part Number: at45db021b
• Description: At45db021b 2-megabit 2.7-volt Only Dataflash
• Manufacturer: ATMEL Corporation

3. Block Diagram
4. Memory Array
Figure 4-1.
1937J–DFLSH–9/05
SECTOR ARCHITECTURE
135,168 bytes (128K + 4K)
65,472 bytes (62K + 1984)
SECTOR 0c = 256 Pages
SECTOR 0b = 248 Pages
67,584 bytes (64K + 2K)
SECTOR 1 = 512 Pages
SECTOR 0a = 8 Pages
2112 bytes (2K + 64)
Memory Architecture Diagram
To provide optimal flexibility, the memory array of the AT45DB021B is divided into three levels of
granularity comprised of sectors, blocks and pages. The Memory Architecture Diagram illus-
trates the breakdown of each level and details the number of pages per sector and block. All
program operations to the DataFlash occur on a page-by-page basis; however, the optional
erase operations can be performed at the block or page level.
RDY/BUSY
RESET
GND
VCC
SCK
WP
CS
SECTOR 0
PAGE (264 BYTES)
BUFFER 1 (264 BYTES)
BLOCK ARCHITECTURE
Block = 2112 bytes
BLOCK 126
BLOCK 127
BLOCK 30
BLOCK 31
BLOCK 32
BLOCK 33
BLOCK 62
BLOCK 63
BLOCK 64
BLOCK 65
BLOCK 0
BLOCK 1
BLOCK 2
(2K + 64)
SI
FLASH MEMORY ARRAY
I/O INTERFACE
8 Pages
PAGE ARCHITECTURE
BUFFER 2 (264 BYTES)
AT45DB021B
SO
Page = 264 bytes
PAGE 1021
PAGE 1022
PAGE 1023
PAGE 14
PAGE 15
PAGE 16
PAGE 17
PAGE 18
PAGE 0
PAGE 1
PAGE 6
PAGE 7
PAGE 8
PAGE 9
(256 + 8)
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