at25df641 ATMEL Corporation, at25df641 Datasheet - Page 5

• Manufacturer Part Number: at25df641
• Description: At25df641 64-megabit 2.7-volt Minimum Spi Serial Flash Memory
• Manufacturer: ATMEL Corporation

3. Block Diagram
Figure 3-1.
4. Memory Array
3680B–DFLASH–2/08
SO (SOI)
SI (SIO)
HOLD
SCK
WP
CS
Block Diagram
INTERFACE
To provide the greatest flexibility, the memory array of the AT25DF641 can be erased in four lev-
els of granularity including a full chip erase. In addition, the array has been divided into physical
sectors of uniform size, of which each sector can be individually protected from program and
erase operations. The size of the physical sectors is optimized for both code and data storage
applications, allowing both code and data segments to reside in their own isolated regions. The
Memory Architecture Diagram illustrates the breakdown of each erase level as well as the
breakdown of each physical sector.
CONTROL
LOGIC
AND
PROTECTION LOGIC
CONTROL AND
Y-DECODER
X-DECODER
AT25DF641 [Preliminary]
AND LATCHES
I/O BUFFERS
MEMORY
ARRAY
Y-GATING
FLASH
DATA BUFFER
SRAM
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