AMD Am29LV400B Service Manual
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ADVANCE INFORMATION
Am29LV400B
4 Megabit (512 K x 8-Bit/256 K x 16-Bit)
CMOS 3.0 Volt-only Boot Sec tor Flash Memory
DISTINCTIVE CHARACTERISTICS
■ Single power supply operation
— Full voltage range: 2.7 to 3. 6 volt read and write
operations for battery-powered applications
— Regulated voltage range: 3.0 to 3. 6 volt read
and write operations and for compatibility with
high performance 3.3 volt microprocessors
■ Manufactured on 0.35 µm process technology
— Compatible with 0.5 µm Am29LV400 device
■ High performance
— Full voltage range: ac cess times as f ast as 80 ns
— Regulated voltage range: access times as fast
as 70 ns
■ Ultra low power consumption (typical values at
5 MHz)
— 200 nA Automatic Sleep mode current
— 200 nA standby mode current
— 7 mA read current
— 15 mA program/erase current
■ Flexible sector architecture
— One 16 Kbyte, two 8 Kbyte, one 32 Kbyte, and
seven 64 Kbyte sectors (byte mode)
— One 8 Kword, two 4 Kword, one 16 Kword, and
seven 32 Kword sectors (word mode)
— Supports full chip erase
— Sector Protection features:
A hardware method of locking a sector to
prevent any program or erase operations within
that sector
Sectors can be locked in-system or via
programming equipment
T emporary Sector Unprotect feat ure allows code
changes in previously locked sectors
■ Unlock Bypass Program Command
■ Top or bottom boot block configurations
■ Embedded Al gorithms
■ Minimum 1,000,000 write cycle guarantee per
■ Package option
■ Compatibility with JEDEC standards
■ Data# Polling and toggle bits
■ Ready/Busy# pin (RY/BY#)
■ Erase Suspend/Erase Resume
■ Hardware reset pin (RESET#)
— Reduces overall programming time when
issuing multiple program command sequences
available
— Embedded Erase algorithm automatically
preprograms and erases the entire chip or any
combination of designated sectors
— Embedded Program algorithm automatically
writes and verifies data at specified addresses
sector
— 48-ball FBGA
— 48-pin TSOP
— 44-pin SO
— Pinout and software compatible with single-
power supply Flash
— Superior inadvertent write protection
— Provides a software method of detecting
program or erase operation completion
— Provides a hardware method of detecting
program or erase cycle completion
— Suspends an erase operati on to read dat a from,
or program data to, a sector that is not being
erased, then resumes the erase operation
— Hardware method to reset the de vi ce to reading
array data
This document contains information on a product under development at Advanced Micro Devices. The information
is intended to help you ev aluate this product. AMD reserves the right to change or dis continue work on thi s proposed
product without notice.
Publication# 21523 Rev: A Amendment/0
Issue Date: January 1998
ADVANCE INFORMATION
GENERAL DESCRIPTION
The Am29LV400B is a 4 Mbit, 3.0 volt-only Flash
memory organized as 524,288 bytes or 262,144 words.
The device is offered in 48-ball FBGA, 44-pin SO, and
48-pin TSOP packages. The wor d-wide data (x16)
appears on DQ 15–DQ0; the byte-wide (x8) data
appears on DQ7–DQ0. This device is designed to be
programmed in-system using only a single 3.0 volt V
supply. No VPP is required for write or erase operations. The device can also be programmed in standard
EPROM programmers.
This device is manufactured usin g AMD’s 0.35 µm
process technology, and offers all the features and
benefits of the Am29LV400, which was manufactured
using 0.5 µm process technology. In addition, the
Am29LV400B features unlock bypass programming
and in-system sector protection/unprotection.
The standard device offers access times of 70, 80, 90
and 120 ns, allowing high speed microprocessors to
operate without wait s tates. To el iminate bus contention the device has separate chip enable (CE#), write
enable (WE#) and output enable (OE#) controls.
The device requires only a single 3. 0 v o lt po wer sup-
ply for both read and write functions. Internally generated and regulated voltages are provided for the
program and erase operations.
The device is entirely command set compatible with the
JEDEC single-power-supply Flash standard. Commands are written to the command regis ter using
standard micropr ocessor wri te timings. Register co ntents serve as input to an internal state-machine that
controls the erase and programming circuitry. Write
cycles also internally latch addresses and data needed
for the programming and erase operations. Reading
data out of the device is similar to reading from other
Flash or EPROM devices.
Device programming occurs by executing the program
command sequence. This initiates the Embedded
Program algorithm—an internal algorithm that automatically times the program pulse widths and verifies
proper cell margin. The Unlock Bypass mode facilitates faster programming times by requir ing only two
write cycles to program data instead of four.
Device erasure occurs by executing the erase command sequence. This initiates the Embedded Erase
algorithm—an internal algorithm that automatically pre-
CC
programs the array (if it is not already progra mmed) before executing the erase operation. During erase, the
device automatically tim es the erase pulse widths and
verifies proper cell margin.
The host system can detect whether a program or
erase operation is complete by observing the RY/BY#
pin, or by reading the DQ7 (Data# Polling) and DQ6
(toggle) status bits. After a program or erase cycle
has been completed, the device is ready to read array
data or accept another command.
The sector erase ar chitecture allo ws memo ry secto rs
to be erased and reprogrammed without affecting the
data contents of other sectors. The device is fully
erased when shipped from the factory.
Hardware data protection meas ures include a low
detector that automatically in hibits write opera-
V
CC
tions during power transitions. The hardware sector
protection feature disables both program and erase
operations in any combination of the sectors of memory. This can be achieved in-system or via programming equipment.
The Erase Suspend feature enables the user to put
erase on hold for any period of time to read data from,
or program data to, any sector that is not selected for
erasure. True background erase can thus be achieved.
The hardware RESET# pi n terminates any operation
in progress and resets the internal state machine to
reading array dat a. The RESET# pin ma y be tied to the
system reset circuitry. A system reset would thus also
reset the device, enabling the system microprocessor
to read the boot-up firmware from the Flash memory.
The device offers two power-saving features. When
addresses have been stable for a specified amount of
time, the device enters the automatic sleep m ode.
The system can also place the de vice into the standby
mode. Power consumption is greatly reduced in both
these modes.
AMD’s Flash technology combines years of Flash
memory manufacturing experience to produce the
highest levels of quality, reliability and cost effectiveness. The device electrically erases all b its wit hin
a sector simultaneously via Fowler-Nordheim tunneling. The data is programmed using hot electron
injection.
1/29/98 Am29LV400B 2
ADVANCE INFORMATION
PRODUCT SELECTOR GUIDE
Family Part Number Am29LV400B
Speed Options
Max access time, ns (t
Max CE# access time, ns (tCE) 70 80 90 120
Max OE# access time, ns (tOE) 30 30 35 50
Regulated Voltage Range: VCC =3.0–3.6 V 70R
Full Voltage Range: VCC = 2.7–3.6 V 80 90 120
) 70 80 90 120
ACC
Note: See “AC Characteristics” for full specifications.
BLOCK DIAGRAM
DQ0
DQ15 (A-1)
–
Input/Output
Buffers
Data
Latch
V
CC
V
SS
RESET#
WE#
BYTE#
CE#
OE#
RY/BY#
State
Control
Command
Register
PGM Voltage
Generator
Sector Switches
Erase Voltage
Generator
Chip Enable
Output Enable
Logic
STB
A0–A17
VCC Detector
Timer
STB
Address Latch
Y-Decoder
X-Decoder
Y-Gating
Cell Matrix
21523A-1
3 Am29LV400B
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