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參數(shù)資料
| 型號： | AM29LV320MT100EI |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 32 Megabit (2 M x 16-Bit/4 M x 8-Bit) MirrorBit 3.0 Volt-only Boot Sector Flash Memory |
| 中文描述： | 2M X 16 FLASH 3V PROM, 100 ns, PDSO48 |
| 封裝： | MO-142B, TSOP-48 |
| 文件頁數(shù)： | 11/61頁 |
| 文件大?。?/td> | 1395K |
| 代理商： | AM29LV320MT100EI |
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May 16, 2003
Am29LV320MT/B
11
D A T A S H E E T
The internal state machine is set for reading array data
upon device power-up, or after a hardware reset. This
ensures that no spurious alteration of the memory
content occurs during the power transition. No com-
mand is necessary in this mode to obtain array data.
Standard microprocessor read cycles that assert valid
addresses on the device address inputs produce valid
data on the device data outputs. The device remains
enabled for read access until the command register
contents are altered.
See “Reading Array Data” for more information. Refer
to the AC
Read-Only Operations
table for timing spec-
ifications and to Figure 14 for the timing diagram.
Refer to the DC Characteristics table for the active
current specification on reading array data.
Page Mode Read
The device is capable of fast page mode read and is
compatible with the page mode Mask ROM read oper-
ation. This mode provides faster read access speed
for random locations within a page. The page size of
the device is 4 words/8 bytes. The appropriate page is
selected by the higher address bits A(max)–A2. Ad-
dress bits A1–A0 in word mode (A1–A-1 in byte mode)
determine the specific word within a page. This is an
asynchronous operation; the microprocessor supplies
the specific word location.
The random or initial page access is equal to t
ACC
or
t
CE
and subsequent page read accesses (as long as
the locations specified by the microprocessor falls
within that page) is equivalent to t
PACC
. When CE# is
deasserted and reasserted for a subsequent access,
the access time is t
ACC
or t
CE
. Fast page mode ac-
cesses are obtained by keeping the “read-page ad-
dresses” constant and changing the “intra-read page”
addresses.
Writing Commands/Command Sequences
To write a command or command sequence (which in-
cludes programming data to the device and erasing
sectors of memory), the system must drive WE# and
CE# to V
IL
, and OE# to V
IH
.
The device features an
Unlock Bypass
mode to facil-
itate faster programming. Once the device enters the
Unlock Bypass mode, only two write cycles are re-
quired to program a word or byte, instead of four. The
“Word/Byte Program Command Sequence” section
has details on programming data to the device using
both standard and Unlock Bypass command se-
quences.
An erase operation can erase one sector, multiple sec-
tors, or the entire device. Tables
3
and
2
indicates the
address space that each sector occupies.
Refer to the DC Characteristics table for the active
current specification for the write mode. The
AC Char-
acteristics
section contains timing specification tables
and timing diagrams for write operations.
Write Buffer
Write Buffer Programming allows the system to write a
maximum of 16 words/32 bytes in one programming
operation. This results in faster effective programming
time than the standard programming algorithms. See
“Write Buffer” for more information.
Accelerated Program Operation
The device offers accelerated program operations
through the ACC function. This is one of two functions
provided by the WP#/ACC pin. This function is prima-
rily intended to allow faster manufacturing throughput
at the factory.
If the system asserts V
HH
on this pin, the device auto-
matically enters the aforementioned Unlock Bypass
mode, temporarily unprotects any protected sectors,
and uses the higher voltage on the pin to reduce the
time required for program operations. The system
would use a two-cycle program command sequence
as required by the Unlock Bypass mode. Removing
V
HH
from the WP#/ACC pin returns the device to nor-
mal operation.
Note that the WP#/ACC pin must not
be at V
HH
for operations other than accelerated pro-
gramming, or device damage may result.
In addition,
no external pullup is necessary since the WP#/ACC
pin has internal pullup to V
CC
.
Autoselect Functions
If the system writes the autoselect command se-
quence, the device enters the autoselect mode. The
system can then read autoselect codes from the inter-
nal register (which is separate from the memory array)
on DQ7–DQ0. Standard read cycle timings apply in
this mode. Refer to the
Autoselect Mode
and
Autose-
lect Command Sequence
sections for more informa-
tion.
Standby Mode
When the system is not reading or writing to the de-
vice, it can place the device in the standby mode. In
this mode, current consumption is greatly reduced,
and the outputs are placed in the high impedance
state, independent of the OE# input.
The device enters the CMOS standby mode when the
CE# and RESET# pins are both held at V
CC
± 0.3 V.
(Note that this is a more restricted voltage range than
V
IH
.) If CE# and RESET# are held at V
IH
, but not within
V
CC
± 0.3 V, the device will be in the standby mode,
but the standby current will be greater. The device re-
quires standard access time (t
CE
) for read access
when the device is in either of these standby modes,
before it is ready to read data.
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