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參數(shù)資料
| 型號(hào)： | AM29LV641DL90REI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control |
| 中文描述： | 64兆位（4個(gè)M x 16位），3.0伏的CMOS只均勻部門閃存與VersatileIO⑩控制記憶 |
| 文件頁數(shù)： | 20/57頁 |
| 文件大?。?/td> | 885K |
| 代理商： | AM29LV641DL90REI |
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18
Am29LV640D/Am29LV641D
22366C6 January22,2007
D A T A S H E E T
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the first or last sector without
using V
ID
.
If the system asserts V
IL
on the WP# pin, the device
disables program and erase functions in the first or last
sector independently of whether those sectors were
protected or unprotected using the method described
in “Sector Group Protection and Unprotection”. Note
that if WP# is at V
IL
when the device is in the standby
mode, the maximum input load current is increased.
See the table in
“DC Characteristics” on page 34
.
If the system asserts V
IH
on the WP# pin, the device
reverts to whether the first or last sector was previ-
ously set to be protected or unprotected using the
method described in
“Sector Group Protection and
Unprotection” on page 17
.
Temporary Sector Group Unprotect
(
Note:
In this device, a sector group consists of four adjacent
sectors that are protected or unprotected at the same time
(see
Table 4 on page 17
)).
This feature allows temporary unprotection of previ-
ously protected sector groups to change data in-sys-
tem. The Sector Group Unprotect mode is activated by
setting the RESET# pin to V
ID
(8.5 V – 12.5 V). During
this mode, formerly protected sector groups can be
programmed or erased by selecting the sector group
addresses. Once V
ID
is removed from the RESET#
pin, all the previously protected sector groups are
protected again.
Figure 1, on page 18
shows the algo-
rithm, and
Figure 21, on page 44
shows the timing dia-
grams, for this feature.
Figure 1.
Temporary Sector Group
Unprotect Operation
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Group Unprotect
Completed (Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sector groups unprotected (If WP# = V
IL
,
the first or last sector remains protected).
2. All previously protected sector groups are protected
once again.
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| AM29LV641DL90RFI | 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control |
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