AT29BV010A Datasheet, PDF (2/10 Pages) ATMEL Corporation – 1 Megabit 128K x 8 Single 2.7-volt Battery-Voltage CMOS Flash

Description (Continued)
To allow for simple in-system reprogrammability, the
AT29BV010A does not require high input voltages for pro-
gramming. The device can be operated with a single 2.7V
to 3.6V supply. Reading data out of the device is similar to
reading from an EPROM. Reprogramming the
AT29BV010A is performed on a sector basis; 128-bytes of
data are loaded into the device and then simultaneously
programmed.
Block Diagram
During a reprogram cycle, the address locations and 128-
bytes of data are captured at microprocessor speed and
internally latched, freeing the address and data bus for
other operations. Following the initiation of a program cy-
cle, the device will automatically erase the sector and then
program the latched data using an internal control timer.
The end of a program cycle can be detected by DATA poll-
ing of I/O7. Once the end of a program cycle has been
detected, a new access for a read or program can begin.
Device Operation
READ: The AT29BV010A 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 control gives designers flexibility in preventing bus
contention.
SOFTWARE DATA PROTECTION PROGRAMMING:
The AT29BV010A has 1024 individual sectors, each 128-
bytes. Using the software data protection feature, byte
loads are used to enter the 128-bytes of a sector to be
programmed. The AT29BV010A can only be programmed
or reprogrammed using the software data protection fea-
ture. The device is programmed on a sector basis. If a byte
of data within the sector is to be changed, data for the en-
tire 128-byte sector must be loaded into the device. The
data in any byte that is not loaded during the programming
of its sector will be indeterminate. The AT29BV010A auto-
matically does a sector erase prior to loading the data into
the sector. An erase command is not required.
Software data protection protects the device from inadver-
tent programming. A series of three program commands
to specific addresses with specific data must be presented
to the device before programming may occur. The same
three program commands must begin each program op-
eration. All software program commands must obey the
sector program timing specifications. Power transitions
will not reset the software data protection feature, however
4-4
AT29BV010A
the software feature will guard against inadvertent pro-
gram cycles during power transitions.
Any attempt to write to the device without the 3-byte com-
mand sequence will start the internal write timers. No data
will be written to the device; however, for the duration of
tWC, a read operation will effectively be a polling operation.
After the software data protection’s 3-byte command code
is given, a byte load is performed 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.
The 128-bytes of data must be loaded into each sector.
Any byte that is not loaded during the programming of its
sector will be indeterminate. Once the bytes of a sector
are loaded into the device, they are simultaneously pro-
grammed during the internal programming period. After
the first data byte has been loaded into the device, suc-
cessive bytes are entered in the same manner. Each new
byte to be programmed must have its high to low transition
on WE (or CE) within 150 µs of the low to high transition of
WE (or CE) of the preceding byte. If a high to low transition
is not detected within 150 µs of the last low to high transi-
tion, the load period will end and the internal programming
period will start. A7 to A16 specify the sector address. The
sector address must be valid during each high to low tran-
sition of WE (or CE). A0 to A6 specify the byte address
(continued)