AT45DB642D-CNU-SL954 ATMEL [ATMEL Corporation], AT45DB642D-CNU-SL954 Datasheet - Page 5

• Manufacturer Part Number: AT45DB642D-CNU-SL954
• Description: 64-megabit 2.7-volt Dual-interface DataFlash
• Manufacturer: ATMEL [ATMEL Corporation]

3. Block Diagram
4. Memory Array
Figure 4-1.
3542H–DFLASH–4/08
SECTOR ARCHITECTURE
SECTOR 30 = 256 Pages
SECTOR 31 = 256 Pages
SECTOR 1 = 256 Pages
SECTOR 2 = 256 Pages
SECTOR 0b = 248 Pages
262,144/270,336 bytes
262,144/270,336
262,144/270,336 bytes
SECTOR 0a = 8 Pages
262,144/270,336 bytes
253,952/261,888 bytes
8192/8,448 bytes
Memory Architecture Diagram
bytes
To provide optimal flexibility, the memory array of the AT45DB642D is divided into three levels of
granularity comprising 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. The erase operations can
be performed at the chip, sector, block or page level.
RDY/BUSY
SER/BYTE
SCK/CLK
RESET
GND
VCC
SECTOR 0
WP
CS
BUFFER 1 (1024/1056 BYTES)
PAGE (1024/1056 BYTES)
BLOCK ARCHITECTURE
Block = 8,192/8,448 bytes
BLOCK 1022
BLOCK 1023
BLOCK 30
BLOCK 31
BLOCK 32
BLOCK 33
BLOCK 62
BLOCK 63
BLOCK 64
BLOCK 65
BLOCK 0
BLOCK 1
BLOCK 2
SI
SO
FLASH MEMORY ARRAY
I/O INTERFACE
8 Pages
BUFFER 2 (1024/1056 BYTES)
I/O7 - I/O0
PAGE ARCHITECTURE
Page = 1,024/1,056 bytes
AT45DB642D
PAGE 8,190
PAGE 8,190
PAGE 14
PAGE 15
PAGE 16
PAGE 17
PAGE 18
PAGE 0
PAGE 1
PAGE 6
PAGE 7
PAGE 8
PAGE 9
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