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AM29DS323D 데이터시트(HTML) 4 Page - Advanced Micro Devices

부품명 AM29DS323D
상세내용  32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory
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제조사  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29DS323D 데이터시트(HTML) 4 Page - Advanced Micro Devices

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Am29DS323D
23480A5 October 10, 2006
D A TA
SH EET
GENERAL DESCRIPTION
The Am29DS323D family consists of 32 megabit, 1.8
volt- on ly flash me m or y d evices, organ ized a s
2,097,152 words of 16 bits each or 4,194,304 bytes of
8 bits each. Word mode data appears on DQ0–DQ15;
byte mode data appears on DQ0–DQ7. The device is
designed to be programmed in-system with the stan-
dard 1.8 volt V
CC supply, and can also be programmed
in standard EPROM programmers.
The device is available with an access time of 110 and
120 ns. The devices are offered in an 48-ball FBGA
package. Standard control pins—chip enable (CE#),
write enable (WE#), and output enable (OE#)—control
normal read and write operations, and avoid bus con-
tention issues.
The device requires only a single 1.8 volt power sup-
ply for both read and write functions. Inter nally
generated and regulated voltages are provided for the
program and erase operations.
Simultaneous Read/Write Operations with
Zero Latency
The Simultaneous Read/Write architecture provides
simultaneous operation by dividing the memory
space into two banks. The device can improve overall
system performance by allowing a host system to pro-
gram or erase in one bank, then immediately and
simultaneously read from the other bank, with zero la-
tency. This releases the system from waiting for the
completion of program or erase operations.
Am29DS323D Features
The Secured Silicon (SecSi) Sector is an additional
64 Kbyte sector capable of being permanently locked
by AMD or customers. The Secured Silicon Sector
Indicator Bit (DQ7) is permanently set to a 1 if the
part is factory locked, and set to a 0 if customer
lockable. This way, customer lockable parts can never
be used to replace a factory locked part.
Factory locked parts provide several options. The Se-
cured Silicon Sector may store a secure, random 16
byte ESN (Electronic Serial Number), customer code
(programmed through AMD’s ExpressFlash service),
or both. Customer Lockable parts may utilize the Se-
cured Silicon Sector as bonus space, reading and
writing like any other flash sector, or may permanently
lock their own code there.
DMS (Data Management Software) allows systems
to easily take advantage of the advanced architecture
of the simultaneous read/write product line by allowing
removal of EEPROM devices. DMS will also allow the
system software to be simplified, as it will perform all
functions necessary to modify data in file structures,
as opposed to single-byte modifications. To write or
update a particular piece of data (a phone number or
configuration data, for example), the user only needs
to state which piece of data is to be updated, and
where the updated data is located in the system. This
is a n a d vanta ge com pare d to syste ms wher e
user-written software must keep track of the old data
location, status, logical to physical translation of the
data onto the Flash memory device (or memory de-
vices), and more. Using DMS, user-written software
does not need to interface with the Flash memory di-
rectly. Instead, the user's software accesses the Flash
memory by calling one of only six functions. AMD pro-
vides this software to simplify system design and
software integration efforts.
The device offers complete compatibility with the
JEDEC single-power-supply Flash command set
standard. Commands are written to the command
register using standard microprocessor write timings.
Reading data out of the device is similar to reading
from other Flash or EPROM devices.
The host system can detect whether a program or
erase operation is complete by using the device sta-
tus bits: RY/BY# pin, DQ7 (Data# Polling) and
DQ6/DQ2 (toggle bits). After a program or erase cycle
has been completed, the device automatically returns
to reading array data.
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.
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 the sectors of mem-
or y. This can be achie v ed in-syst em or via
programming equipment.
The device offers two power-saving features. When
addresses have been stable for a specified amount of
time, the device enters the automatic sleep mode.
The system can also place the device into the
standby mode. Power consumption is greatly re-
duced in both modes.


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