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參數(shù)資料
| 型號： | L29S800F |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8MEGABIT (1M】8 /512K】16) 3 VOLT CMOS FLASH MEMERY |
| 中文描述： | 8MEGABIT（100萬】8 / 16】為512k）3伏的CMOS閃存MEMERY |
| 文件頁數(shù)： | 11/54頁 |
| 文件大?。?/td> | 797K |
| 代理商： | L29S800F |
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L29S800F
PRELIMINARY
A
8MEGABIT (1M×8 /512K×16)
3 VOLT CMOS FLASH MEMERY
LinkSmart
Write
11
071802
Device erasure and programming are accomplished via the command register. The contents of the
register serve as inputs to the internal state machine. The state machine outputs dictate the function of
the device.
The command register itself does not occupy any addressable memory location. The register is a latch
used to store the commands, along with the address and data information needed to execute the
command. 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
WE
or
CE
, whichever happens later; while data is
latched on the rising edge of
WE
or
CE
, whichever happens first. Standard microprocessor write
timings are used.
Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing
parameters.
Sector Protection
The L29S800F/-B feature hardware sector protection. This feature will disable both program and erase
operations in any number of sectors (0 through 18). The sector protection feature is enabled using
programming equipment at the user’s site. The devices are shipped with all sectors unprotected.
Alternatively, LST may program and protect sectors in the factory prior to shipping the device.
To activate this mode, the programming equipment must force V
ID
on address pin A9 and control pin
OE
, (suggest V
ID
= 11.5 V),
CE
= V
IL
, and A
6
= V
IL
. The sector addresses (A
18
, A
17
, A
16
, A
15
, A
14
,
A
13
, and A
12
) should be set to the sector to be protected. Tables 5 and 6 define the sector address for
each of the nineteen (19) individual sectors. Programming of the protection circuitry begins on the
falling edge of the
WE
pulse and is terminated with the rising edge of the same. Sector addresses
must be held constant during the
WE
pulse. See Figures 16 and 24 for sector protection waveforms
and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
ID
on
address pin A
9
with
CE
and
OE
at V
IL
and
WE
at V
IH
. Scanning the sector addresses (A
18
, A
17
,
A
16
, A
15
, A
14
, A
13
, and A
12
) while (A
6
, A
1
, A
0
) = (0, 1, 0) will produce a logical “1” code at device output
DQ
0
for a protected sector. Otherwise the devices will read 00H for unprotected sector. In this mode,
the lower order addresses, except for A
0
, A
1
, and A
6
are DON’T CARES. Address locations with A
1
=
V
IL
are reserved for Autoselect manufacturer and device codes.
A
-1
requires to apply to V
IL
on byte mode.
It is also 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 addresses (A
18
,
A
17
, A
16
, A
15
, A
14
, A
13
, and A
12
) are the desired sector address will produce a logical “1” at DQ
0
for a
protected sector. See Tables 4.1 and 4.2 for Autoselect codes.
Temporary Sector Unprotection
This feature allows temporary unprotection of previously protected sectors of the L29S800F/-B devices
in order to change data. The Sector Unprotection mode is activated by setting the
RESET
pin to high
voltage (12 V). During this mode, formerly protected sectors can be programmed or erased by selecting
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