參數(shù)資料
型號(hào)： L640DU90NF
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： L640DU90NF
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.
相關(guān)PDF資料
PDF描述
L640DU90NI 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control
L640DU90RF 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L640DU90NI 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control
L640DU90RF 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control
L640DU90RI 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO⑩ Control
L640GU53NI 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control
L640GU53RI 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control
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