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AM29F004BT-90JI Fiches technique(PDF) 4 Page - SPANSION

No de pièce AM29F004BT-90JI
Description  4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
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Am29F004B
Am29F004B_00_E4 May 9, 2006
D A TA
SH EE T
GENERAL DESCRIPTION
The Am29F004B is a 4 Mbit, 5.0 volt-only Flash memory
device organized as 524,288 bytes. The data appears on
DQ0–DQ7. The device is offered in a 32-pin PLCC package.
This device is designed to be programmed in-system with the
standard system 5.0 volt VCC supply. A 12.0 volt VPP is not
required for program or erase operations. The device can also
be programmed in standard EPROM programmers.
The device offers access times of up to 70 ns, allowing high
speed microprocessors to operate without wait states. To
eliminate bus contention each device has separate chip
enable (CE#), write enable (WE#) and output enable (OE#)
controls.
Each device requires only a single 5.0 volt power supply for
both read and write functions. Internally generated and regu-
lated voltages are provided for the program and erase
operations.
The Am29F004B is entirely command set compatible with the
JEDEC single-power-supply Flash standard. Commands
are written to the command register using standard micropro-
cessor write timing. Register contents serve as inputs to an
internal state-machine that controls the erase and program-
ming 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.
Device erasure occurs by executing the erase command
sequence. This initiates the Embedded Erase algorithm–an
internal algorithm that automatically preprograms the array (if it
is not already programmed) before executing the erase opera-
tion. During erase, the device automatically times the erase
pulse widths and verifies proper cell margin.
The host system can detect whether a program or erase
operation is complete by reading the DQ7 (Data# Polling), or
DQ6 (toggle) status bits. After a program or erase cycle is
completed, the device is ready to read array data or accept
another command.
The sector erase architecture allows memory sectors to be
erased and reprogrammed without affecting the data con-
tents of other sectors. The device is fully erased when
shipped from the factory.
Hardware data protection measures include a low VCC
detector that automatically inhibits write operations during
power transitions.
The hardware sector protection feature dis-
ables both program and erase operations in any combination
of 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 back-
ground erase can thus be achieved.
The device offers a standby mode as a power-saving fea-
ture. Once the system places the device into the standby
mode power consumption is greatly reduced.
AMD’s Flash technology combines years of Flash memory
manufacturing experience to produce the highest levels of
quality, reliability and cost effectiveness. The device electri-
cally erases all bits within a sector simultaneously via Fowler-
Nordheim tunnelling. The data is programmed using hot elec-
tron injection.


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