at49f8011 ATMEL Corporation, at49f8011 Datasheet - Page 3

• Manufacturer Part Number: at49f8011
• Description: 8-megabit 512k X 16/ 1m X 8 5-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

Block Diagram
Device
Operation
1264D–FLASH–5/03
A0 - A18
Y-DECODER
X-DECODER
ADDRESS
BUFFER
LATCH
INPUT
READ: The AT49F8011(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 are asserted on
the outputs. 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.
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 command sequences are entered into the device. The command
sequences are shown in the Command Definitions table (I/O8 - I/O15 are don't care inputs for
the command codes). 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, 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.
RESET: A RESET input pin is provided to ease some system applications. When RESET is at
a logic high level, the device is in its standard operating mode. A low level on the RESET input
halts the present device operation and puts the outputs of the device in a high impedance
state. When a high level is reasserted on the RESET pin, the device returns to the Read or
Standby mode, depending upon the state of the control inputs. By applying a 12V ± 0.5V input
signal to the RESET pin any sector can be reprogrammed even if the sector lockout feature
has been enabled (see Sector Programming Lockout Override section).
OUTPUT
BUFFER
PLANE A SECTORS
COMPARATOR
I/O0 - I/O15/A-1
SECTORS
PLANE B
IDENTIFIER
REGISTER
REGISTER
Y-GATING
STATUS
DATA
BUFFER
INPUT
WRITE STATE
COMMAND
REGISTER
MACHINE
PROGRAM/ERASE
VOLTAGE SWITCH
AT49F8011(T)
VCC
GND
CE
WE
OE
RESET
BYTE
RDY/BUSY
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