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AT45DB081B
Memory Architecture Diagram
SECTOR ARCHITECTURE
BLOCK ARCHITECTURE
PAGE ARCHITECTURE
SECTOR 0 = 8 Pages
2112 bytes (2K + 64)
SECTOR 0
BLOCK 0
BLOCK 1
8 Pages
PAGE 0
PAGE 1
SECTOR 1 = 248 Pages
65,472 bytes (62K + 1984)
SECTOR 2 = 256 Pages
BLOCK 2
PAGE 6
67,584 bytes (64K + 2K)
SECTOR 3 = 512 Pages
135,168 bytes (128K + 4K)
SECTOR 4 = 512 Pages
135,168 bytes (128K + 4K)
SECTOR 8 = 512 Pages
135,168 bytes (128K + 4K)
SECTOR 9 = 512 Pages
135,168 bytes (128K + 4K)
BLOCK 30
BLOCK 31
BLOCK 32
BLOCK 33
BLOCK 62
BLOCK 63
BLOCK 64
BLOCK 65
BLOCK 510
BLOCK 511
Block = 2112 bytes
(2K + 64)
PAGE 7
PAGE 8
PAGE 9
PAGE 14
PAGE 15
PAGE 16
PAGE 17
PAGE 18
PAGE 4093
PAGE 4094
PAGE 4095
Page = 264 bytes
(256 + 8)
Device
Operation
Read Commands
The device operation is controlled by instructions from the host processor. The list of instructions
and their associated opcodes are contained in Tables 1 through 4. 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 is referenced in the datasheet using the terminology BFA8 - BFA0 to denote
the nine address bits required to designate a byte address within a buffer. Main memory
addressing is referenced using the terminology PA11 - PA0 and BA8 - BA0 where PA11 - PA0
denotes the 12 address bits required to designate a page address and BA8 - BA0 denotes the
nine address bits required to designate a byte address within the page.
By specifying the appropriate opcode, data can be read from the main memory or from either
one of the two data buffers. The DataFlash supports two categories of read modes in relation to
the SCK signal. The differences between the modes are in respect to the inactive state of the
SCK signal as well as which clock cycle data will begin to be output. The two categories, which
are comprised of four modes total, are defined as Inactive Clock Polarity Low or Inactive Clock
Polarity High and SPI Mode 0 or SPI Mode 3. A separate opcode (refer to <blue>Table 1 on
page 10 for a complete list) is used to select which category will be used for reading. Please
refer to the “Detailed Bit-level Read Timing” diagrams in this datasheet for details on the clock
cycle sequences for each mode.
CONTINUOUS ARRAY READ: By supplying an initial starting address for the main memory
array, the Continuous Array Read command can be utilized to sequentially read a continuous
stream of data from the device by simply providing a clock signal; no additional addressing
information or control signals need to be provided. The DataFlash incorporates an internal
address counter that will automatically increment on every clock cycle, allowing one continuous
read operation without the need of additional address sequences. To perform a continuous read,
an opcode of 68H or E8H must be clocked into the device followed by 24 address bits and 32
don’t care bits. The first three bits of the 24-bit address sequence are reserved for upward and
3
2225J–DFLSH–2/08
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相关代理商/技术参数
AT45DB081B-TI-2.5 功能描述:闪存 8M SERIAL 2.7V - 2.5V IND TEMP RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
AT45DB081B-TU 功能描述:闪存 8M 28 I/O Pins SPI 264B 2.7V RoHS:否 制造商:ON Semiconductor 数据总线宽度:1 bit 存储类型:Flash 存储容量:2 MB 结构:256 K x 8 定时类型: 接口类型:SPI 访问时间: 电源电压-最大:3.6 V 电源电压-最小:2.3 V 最大工作电流:15 mA 工作温度:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体: 封装:Reel
AT45DB081D 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_07 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_08 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_09 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-megabit 2.5-volt or 2.7-volt DataFlash
AT45DB081D_13 制造商:AD 制造商全称:Analog Devices 功能描述:8-megabit 2.5V or 2.7V DataFlash
AT45DB081D-DWF 制造商:Adesto Technologies Corporation 功能描述:WHOLE WAFER, NO BACKGRIND - Gel-pak, waffle pack, wafer, diced wafer on film