at49bv040a ATMEL Corporation, at49bv040a Datasheet - Page 3

• Manufacturer Part Number: at49bv040a
• Description: At49bv040a 4-megabit 512k X 8 Single 2.7-volt Battery-voltage Flash Memory
• Manufacturer: ATMEL Corporation

3. Block Diagram
4. Device Operation
4.1
3358C–FLASH–3/05
Read
The AT49BV040A 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 outputs.
The outputs are put in the high impedance state whenever CE or OE is high. This dual-line con-
trol gives designers flexibility in preventing bus contention.
ADDRESS
INPUTS
RESET
GND
VCC
WE
OE
CE
Y DECODER
X DECODER
CONTROL
LOGIC
DATA INPUTS/OUTPUTS
DATA LATCHES
INPUT/OUTPUT
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
MAIN MEMORY
BOOT BLOCK
PARAMETER
PARAMETER
AT49BV040A
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(64K BYTES)
(32K BYTES)
(16K BYTES)
(8K BYTES)
(8K BYTES)
PROGRAM
Y-GATING
I/O7 - I/O0
BUFFERS
BLOCK 8
BLOCK 7
BLOCK 6
BLOCK 5
BLOCK 4
BLOCK 3
BLOCK 2
BLOCK 1
BLOCK 2
BLOCK 1
8
AT49BV040A
7FFFF
70000
6FFFF
60000
5FFFF
50000
4FFFF
40000
3FFFF
30000
2FFFF
20000
1FFFF
10000
0FFFF
08000
07FFF
06000
05FFF
04000
03FFF
00000
3