AT49BV1604 ATMEL Corporation, AT49BV1604 Datasheet - Page 3

• Manufacturer Part Number: AT49BV1604
• Description: 16-Megabit 1M x 16/2M x 8 3-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

A V
pin can be tied to V
gramming and erasing, the pin should supply 4.5 to 5.5
volts during program and erase operations.
A six byte command (bypass unlock) sequence to remove
th e req uirement of ente ring the three byte prog ra m
sequence is offered to further improve programming time.
After entering the six byte code, only single pulses on the
write control lines are required for writing into the device.
This mode (single pulse byte/word program) is exited by
powering down the device, or by pulsing the RESET pin
low for a minimum of 50 ns and then bringing it back to V
Erase and Erase Suspend/Resume commands will not
work while in this mode; if entered they will result in data
Block Diagram
Device Operation
READ: The AT49BV16X4(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
contro l gives design ers flexib ility in preventing bu s
contention.
PP
pin is provided to improve program/erase times. This
A0 - A19
CC
. To take advantage of faster pro-
Y-DECODER
X-DECODER
ADDRESS
BUFFER
LATCH
INPUT
OUTPUT
BUFFER
PLANE A SECTORS
COMPARATOR
I/O0 - I/O15/A-1
SECTORS
PLANE B
IDENTIFIER
REGISTER
REGISTER
Y-GATING
STATUS
DATA
AT49BV1604(T)/1614(T)
CC
.
BUFFER
INPUT
being programmed into the device. It is not recommended
that the six byte code reside in the software of the final
product but only exist in external programming code.
For the AT49BV1614(T), the BYTE pin controls whether
the device data I/O pins operate in the byte or word config-
uration. If the BYTE pin is set at logic “1”, the device is in
word configuration, I/O0-I/O15 are active and controlled by
CE and OE.
If the BYTE pin is set at logic “0”, the device is in byte con-
figuration, and only data I/O pins I/O0 - I/O7 are active and
controlled by CE and OE. The data I/O pins I/O8 - I/O14
are tri-stated, and the I/O15 pin is used as an input for the
LSB (A-1) address function.
COMMAND SEQUENCES: When the device is first pow-
ered 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).
WRITE STATE
COMMAND
REGISTER
MACHINE
VOLTAGE SWITCH
PROGRAM/ERASE
CE
WE
OE
RESET
BYTE
RDY/BUSY
VPP
VCC
GND
3