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AT45DB011D Datasheet(PDF) 4 Page - ATMEL Corporation

Part # AT45DB011D
Description  1-megabit 2.7-volt DataFlash
Download  52 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB011D Datasheet(HTML) 4 Page - ATMEL Corporation

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3639B–DFLASH–02/07
AT45DB011D [Preliminary]
4.
Memory Array
To provide optimal flexibility, the memory array of the AT45DB011D 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.
Figure 4-1.
Memory Architecture Diagram
5.
Device Operation
The device operation is controlled by instructions from the host processor. The list of instructions
and their associated opcodes are contained in Tables 15-1 through 15-7. A valid instruction
starts with the falling edge of CS followed by the appropriate 8-bit opcode and the desired buffer
or main memory address location. While the CS pin is low, toggling the SCK pin controls the
loading of the opcode and the desired buffer or main memory address location through the SI
(serial input) pin. All instructions, addresses, and data are transferred with the most significant
bit (MSB) first.
Buffer addressing for the DataFlash standard page size (264 bytes) is referenced in the
datasheet using the terminology BFA8 - BFA0 to denote the 9 address bits required to designate
a byte address within a buffer. Main memory addressing is referenced using the terminology
PA8 - PA0 and BA8 - BA0, where PA8 - PA0 denotes the 9 address bits required to designate a
page address and BA8 - BA0 denotes the 9 address bits required to designate a byte address
within the page.
For the “Power of 2” binary page size (256 bytes), the Buffer addressing is referenced in the
datasheet using the conventional terminology BFA7 - BFA0 to denote the 8 address bits
required to designate a byte address within a buffer. Main memory addressing is referenced
using the terminology A16 - A0, where A16 - A8 denotes the 9 address bits required to desig-
nate a page address and A7 - A0 denotes the 8 address bits required to designate a byte
address within a page.
SECTOR 0a = 8 Pages
2,048/2,112 bytes
SECTOR 0b = 120 Pages
31,744/32,726 bytes
Block = 2,048/2,112 bytes
8 Pages
SECTOR 0a
Page = 256/264 bytes
PAGE 0
PAGE 1
PAGE 6
PAGE 7
PAGE 8
PAGE 9
PAGE 510
PAGE 511
PAGE 14
PAGE 15
PAGE 16
PAGE 17
PAGE 18
SECTOR ARCHITECTURE
BLOCK ARCHITECTURE
PAGE ARCHITECTURE
BLOCK 0
BLOCK 1
BLOCK 13
BLOCK 14
BLOCK 15
BLOCK 16
BLOCK 62
BLOCK 63
BLOCK 28
BLOCK 29
BLOCK 30
BLOCK 31
SECTOR 3 = 128 Pages
32,768/33,792 bytes
BLOCK 2
SECTOR 1 = 128 Pages
32,768/33,792 bytes
SECTOR 2 = 128 Pages
32,768/33,792 bytes


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