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參數(shù)資料
| 型號： | AM29LV800T |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 8 Megabit (1,048,576 x 8-Bit/524,288 x 16-Bit) CMOS 3.0 Volt-only, Sectored Flash Memory |
| 中文描述： | 8兆位（1,048,576 x 8-Bit/524，288 x 16位），3.0伏的CMOS只，扇區(qū)閃存 |
| 文件頁數(shù)： | 14/48頁 |
| 文件大?。?/td> | 207K |
| 代理商： | AM29LV800T |
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14
Am29LV800T/Am29LV800B
P R E L I M I N A R Y
Write
Device erasure and programming are accomplished via
the command register. The command register is written
by bringing WE to V
IL
, while CE is at V
IL
and OE is at
V
IH
. Addresses are latched on the falling edge of CE or
WE, whichever occurs later, while data is latched on the
rising edge of the CE or WE pulse, whichever occurs
first. Standard microprocessor write timings are used.
Refer to AC Write Characteristics and the Erase/
Programming Waveforms for specific timing parameters.
Sector Protect
Sectors of the Am29LV800 may be hardware pro-
tected at the user’s factory with external programming
equipment. The protection circuitry will disable both
program and erase functions for the protected sec-
tors, making the protected sectors read-only. Re-
quests to program or erase a protected sector will be
ignored by the device. If the user attempts to write to
a protected sector, DATA Polling will be activated for
about 1
μ
s; the device will then return to read mode,
with data from the protected sector unchanged. If the
user attempts to erase a protected sector, Toggle Bit
will be activated for about 50
μ
s; the device will then
return to read mode, without having erased the pro-
tected sector.
It is possible to determine if a sector is protected in the
system by writing an Autoselect command. Performing
a read operation at the address location XX02h, where
the higher order address A18–A12 represents the sec-
tor address, will produce a logical ‘1’ at DQ0 for a pro-
tected sector.
Temporary Sector Unprotect
The sectors of the Am29LV800 may be temporarily
unprotected by raising the RESET pin to 12.0 Volts
(V
ID
). During this mode, formerly protected sectors
can be programmed or erased with standard com-
mand sequences by selecting the appropriate byte or
sector addresses. Once the RESET pin goes to TTL
level (V
IH
), all the previously protected sectors will be
protected again.
Command Definitions
Device operations are selected by writing specific ad-
dress and data sequences into the command register.
Writing incorrect address and data values or writing
them in the improper sequence will reset the device
to the read mode.
Table 6 defines the valid register
command sequences. Note that the Erase Suspend
(B0h) and Erase Resume (30h) commands are valid
only while the Sector Erase operation is in progress.
Read/Reset Command
The device will automatically power up in the read/
reset state. In this case, a command sequence is
not required to read data. Standard microproces-
sor cycles will retrieve array data. This default
value ensures that no spurious alteration of the
memory content occurs during the power transi-
tion.
Refer to the AC Characteristics section for the
specific timing parameters.
The read or reset operation is initiated by writing the
read/reset command sequence into the command reg-
ister. Microprocessor read cycles retrieve array data
from the memory. The device remains enabled for
reads until the command register contents are altered.
Autoselect Command
Flash memories are intended for use in applications
where the local CPU alters memory contents. As such,
manufacturer and device codes must be accessible
while the device resides in the target system. The
Am29LV800 contains an autoselect command opera-
tion that provides device information and sector protec-
tion status to the system. The operation is initiated by
writing the autoselect command sequence into the
command register. Following the command write, a
read cycle from address XX00h retrieves the manufac-
turer code of 01h. A read cycle from address
XX01hreturns the device code DAh/5Bh for x8 configu-
ration or 22DAh/225Bh for x16 configuration (see Table
3). All manufacturer and device codes will exhibit odd
parity with the MSB of the lower byte (DQ7) defined as
the parity bit. Scanning the sector addresses (A12,
A13, A14, A15, A16, A17, and A18) while (A6, A1, A0)
= (0, 1, 0) will produce a logical ‘1’ code at device output
DQ0 for a write protected sector (See Table 3).
To terminate the Autoselect operation, it is neces-
sary to write the read/reset command sequence
into the register.
RESET
+12.0 V
500 ns min.
20478D-8
Figure 1.
Temporary Sector Unprotect Timing Diagram
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