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AT49BV002A Datasheet(PDF) 3 Page - ATMEL Corporation

Part # AT49BV002A
Description  2-megabit (256K x 8) Single 2.7-volt Battery-Voltage Flash Memory
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT49BV002A Datasheet(HTML) 3 Page - ATMEL Corporation

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3
3353F–FLASH–3/05
AT49BV002A(N)(T)
3.
Block Diagram
4.
Device Operation
4.1
Read
The AT49BV002A(N)(T) is accessed like an EPROM. When CE and OE are low and WE is high,
the data stored at the memory location determined by the address pins is asserted on the out-
puts. The outputs are put in the high impedance state whenever CE or OE is high. This dual-line
control gives designers flexibility in preventing bus contention.
4.2
Command Sequences
When the device is first powered on it will be reset to the read or standby mode depending upon
the state of the control line inputs. In order to perform other device functions, a series of com-
mand sequences are entered into the device. The command sequences are shown in the
“Command Definition Table”. The command sequences are written by applying a low pulse on
the WE or CE input with CE or WE low (respectively) and OE high. The address is latched on the
falling edge of CE or WE (except for the sixth cycle of the Sector Erase command), whichever
occurs last. The data is latched by the first rising edge of CE or WE. Standard microprocessor
write timings are used. The address locations used in the command sequences are not affected
by entering the command sequences.
CONTROL
LOGIC
Y DECODER
PARAMETER
BLOCK 1
(8K BYTES)
BOOT BLOCK
(16K BYTES)
OE
WE
CE
RESET
ADDRESS
INPUTS
VCC
GND
AT49BV002A(N)
DATA INPUTS/OUTPUTS
I/O7 - I/O0
8
X DECODER
PARAMETER
BLOCK 2
(8K BYTES)
MAIN MEMORY
BLOCK 1
(32K BYTES)
MAIN MEMORY
BLOCK 2
(64K BYTES)
MAIN MEMORY
BLOCK 3
(64K BYTES)
MAIN MEMORY
BLOCK 4
(64K BYTES)
PROGRAM
DATA LATCHES
Y-GATING
INPUT/OUTPUT
BUFFERS
1FFFF
10000
0FFFF
08000
3FFFF
30000
2FFFF
20000
07FFF
06000
05FFF
04000
03FFF
00000
PARAMETER
BLOCK 1
(8K BYTES)
BOOT BLOCK
(16K BYTES)
AT49BV002A(N)T
DATA INPUTS/OUTPUTS
I/O7 - I/O0
8
PARAMETER
BLOCK 2
(8K BYTES)
MAIN MEMORY
BLOCK 1
(32K BYTES)
MAIN MEMORY
BLOCK 2
(64K BYTES)
PROGRAM
DATA LATCHES
Y-GATING
INPUT/OUTPUT
BUFFERS
3FFFF
3C000
3BFFF
3A000
39FFF
38000
37FFF
30000
2FFFF
20000
MAIN MEMORY
BLOCK 3
(64K BYTES)
MAIN MEMORY
BLOCK 4
(64K BYTES)
1FFFF
10000
0FFFF
00000


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