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AM28F512A-150PIB Datenblatt(PDF) 2 Page - Advanced Micro Devices

Teilenummer AM28F512A-150PIB
Bauteilbeschribung  512 Kilobit (64 K x 8-Bit) CMOS 12.0 Volt, Bulk Erase Flash Memory with Embedded Algorithms
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Hersteller  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

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Am28F512A
controlled internal to the device. Typical erasure at room
temperature is accomplished in two seconds, including
programming.
AMD’s Am28F512A is entirely pin and software com-
patible with AMD Am28F020A, Am28F010A, and
Am28F256A Flash memories.
Commands are written to the command register using
standard microprocessor write timings. Register con-
tents serve as inputs to an internal state-machine
which controls the erase and programming circuitry.
During write cycles, the command register internally
latches address and data needed for the program-
ming and erase operations. For system design simpli-
fication, the Am28F512A is designed to support either
WE# or CE controlled writes. During a system write
cycle, addresses are latched on the falling edge of
WE# or CE# whichever occurs last. Data is latched on
the rising edge of WE# or CE# whichever occurs first.
To simplify the following discussion, the WE# pin is
used as the write cycle control pin throughout the rest
of this text. All setup and hold times are with respect
to the WE# signal.
AMD’s Flash technology combines years of EPROM
and EEPROM experience to produce the highest lev-
els of quality, reliability, and cost effectiveness. The
Am28F512A electrically erases all bits simulta-
neously using Fowler-Nordheim tunneling. The bytes
are programmed one byte at a time using the EPROM
programming mechanism of hot electron injection.
Comparing Embedded Algorithms with Flasherase and Flashrite Algorithms
Am28F512A with
Embedded Algorithms
Am28F512 using AMD Flashrite
and Flasherase Algorithms
Embedded
Programming
Algorithm vs.
Flashrite
Programming
Algorithm
AMD’s Embedded Programming algorithm
requires the user to only write a program
set-up command and a program command
(program data and address). The device
automatically times the programming
pulse width, verifies the programming, and
counts the number of sequences. A status
bit, Data
# Polling, provides the user with
the programming operation status.
The Flashrite Programming algorithm requires the
user to write a program set-up command, a program
command, (program data and address), and a
program verify command, followed by a read and
compare operation. The user is required to time the
programming pulse width in order to issue the
program verify command. An integrated stop timer
prevents any possibility of overprogramming.
Upon completion of this sequence, the data is read
back from the device and compared by the user with
the data intended to be written; if there is not a
match, the sequence is repeated until there is a
match or the sequence has been repeated 25 times.
Embedded Erase
Algorithm vs.
Flasherase Erase
Algorithm
AMD’s Embedded Erase algorithm
requires the user to only write an erase set-
up command and erase command. The
device automatically pre-programs and
verifies the entire array. The device then
automatically times the erase pulse width,
verifies the erase operation, and counts
the number of sequences. A status bit,
Data
# Polling, provides the user with the
erase operation status.
The Flasherase Erase algorithm requires the device
to be completely programmed prior to executing an
erase command.
To invoke the erase operation, the user writes an
erase set-up command, an erase command, and an
erase verify command. The user is required to time
the erase pulse width in order to issue the erase
verify command. An integrated stop timer prevents
any possibility of overerasure.
Upon completion of this sequence, the data is read
back from the device and compared by the user with
erased data. If there is not a match, the sequence is
repeated until there is a match or the sequence has
been repeated 1,000 times.


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