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AM29LV640MH 데이터시트(Datasheet) 4 Page - SPANSION

부품명 AM29LV640MH
상세내용  64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
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제조사  SPANSION [SPANSION]
홈페이지  http://www.spansion.com
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Am29LV640MH/L
December 14, 2005
DA TA SH EET
GENERAL DESCRIPTION
The Am29LV640MH/L is a 64 Mbit, 3.0 volt single
power supply flash memory device organized as
4,194,304 words or 8,388,608 bytes. The device has
an 8-bit/16-bit bus and can be programmed either in
the host system or in standard EPROM programmers.
An access time of 90, 100, 110, or 120 ns is available.
Note that each access time has a specific operating
voltage range (V
CC) and an I/O voltage range (VIO), as
specified in the Product Selector Guide and the Order-
ing Information sections. The device is offered in a
56-pin TSOP or 64-ball Fortified BGA package. Each
device has separate chip enable (CE#), write enable
(WE#) and output enable (OE#) controls.
Each device requires only a single 3.0 volt power
supply for both read and write functions. In addition to
a V
CC input, a high-voltage accelerated program
(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
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.
The VersatileI/O™ (V
IO) control allows the host sys-
tem to set the voltage levels that the device generates
and tolerates on the CE# control input and DQ I/Os to
the same voltage level that is asserted on the V
IO pin.
Refer to the Ordering Information section for valid V
IO
options.
Hardware data protection measures include a low
V
CC detector that automatically inhibits write opera-
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 Sus-
pend/Program Resume feature enables the host sys-
tem to pause a program operation in a given sector to
read any other sector and then complete the program
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.
The device reduces power consumption in the
standby mode when it detects specific voltage levels
on CE# and RESET#, or when addresses have been
stable for a specified period of time.
The Write Protect (WP#) feature protects the first or
last sector by asserting a logic low on the WP#/ACC
pin. The protected sector will still be protected even
during accelerated programming.
The SecSi
™ (Secured Silicon) Sector provides a
128-word/256-byte area for code or data that can be
permanently protected. Once this sector is protected,
no further changes within the sector can occur.
Spansion MirrorBit flash technology combines years of
Flash memory manufacturing experience to produce
the highest levels of quality, reliability and cost effec-
tiveness. The device electrically erases all bits within a
sector simultaneously via hot-hole assisted erase. The
data is programmed using hot electron injection.




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