am49lv6408m Meet Spansion Inc., am49lv6408m Datasheet - Page 4

• Manufacturer Part Number: am49lv6408m
• Description: Stacked Multi-chip Mcp 64 Mbit 4 M ? 16 Bit Flash Memory And 8 Mbit 512k ? 16 Bit Pseudo Static Ram
• Manufacturer: Meet Spansion Inc.

GENERAL DESCRIPTION
Am29LV640MH/L Features
The Am29LV640MH/L is a 64 Mbit, 3.0 volt single
power supply flash memory device organized as
4,194,304 words. The device has an 16-bit bus and
can be programmed either in the host system or in
standard EPROM programmers.
Each device requires only a single 3.0 volt power
supply for both read and write functions. In addition to
a V
(ACC) feature provides shorter programming times
through increased current on the WP#/ACC input. This
feature is intended to facilitate factory throughput dur-
ing system production, but may also be used in the
field if desired.
The device is entirely command set compatible with
the JEDEC single-power-supply Flash standard.
Commands are written to the device using standard
microprocessor write timing. Write cycles also inter-
nally latch addresses and data needed for the pro-
gramming and erase operations.
The sector erase architecture allows memory sec-
tors to be erased and reprogrammed without affecting
the data contents of other sectors. The device is fully
erased when shipped from the factory.
Device programming and erasure are initiated through
command sequences. Once a program or erase oper-
ation has begun, the host system need only poll the
2
CC
input, a high-voltage accelerated program
A D V A N C E
Am49LV6408M
I N F O R M A T I O N
DQ7 (Data# Polling) or DQ6 (toggle) status bits or
monitor the Ready/Busy# (RY/BY#) output to deter-
mine whether the operation is complete. To facilitate
programming, an Unlock Bypass mode reduces com-
mand sequence overhead by requiring only two write
cycles to program data instead of four.
Hardware data protection measures include a low
V
tions during power transitions. The hardware sector
protection feature disables 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/Erase Resume feature allows
the host system to pause an erase operation in a
given sector to read or program any other sector and
then complete the erase operation. The Program
Suspend/Program Resume feature enables the host
system to pause a program operation in a given sector
to read any other sector and then complete the pro-
gram operation.
The hardware RESET# pin terminates any operation
in progress and resets the device, after which it is then
ready for a new operation. The RESET# pin may be
tied to the system reset circuitry. A system reset would
thus also reset the device, enabling the host system to
read boot-up firmware from the Flash memory device.
CC
detector that automatically inhibits write opera-
November 5, 2003