at25df321 ATMEL Corporation, at25df321 Datasheet - Page 4

• Manufacturer Part Number: at25df321
• Description: At25df321 32-megabit 2.7-volt Only Serial Firmware Dataflash Memory
• Manufacturer: ATMEL Corporation

3. Block Diagram
4. Memory Array
4
AT25DF321
To provide the greatest flexibility, the memory array of the AT25DF321 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.
down of each physical sector.
HOLD
Figure 2-1.
SCK
WP
SO
CS
SI
Figure 4-1 on page 5
GND
WP
SO
CS
INTERFACE
8-SOIC Top View
CONTROL
1
2
3
4
LOGIC
AND
8
7
6
5
illustrates the breakdown of each erase level as well as the break-
VCC
HOLD
SCK
SI
PROTECTION LOGIC
CONTROL AND
X-DECODER
Figure 2-2.
Y-DECODER
HOLD
VCC
NC
NC
NC
NC
SO
CS
16-SOIC Top View
1
2
3
4
5
6
7
8
AND LATCHES
I/O BUFFERS
MEMORY
Y-GATING
ARRAY
FLASH
16
15
14
13
12
11
10
9
3669A–DFLASH–07/07
DATA BUFFER
SRAM
SCK
SI
NC
NC
NC
NC
GND
WP