參數(shù)資料
型號(hào)： L640GU73VI
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 VersatileI/O⑩ Control
中文描述： 64兆位（4個(gè)M x 16位）的CMOS 3.0伏特，只有統(tǒng)一閃存部門(mén)與VersatileI /輸出⑩控制
文件頁(yè)數(shù)： 20/55頁(yè)
文件大小： 719K
代理商： L640GU73VI
21
Am29LV641G
June 14, 2005
A D V A N C E I N F O R M A T I O N
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 de-
scribed 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 in-
creased. See the table in “DC Characteristics”.
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”.
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)).
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 shows the algorithm, and
Figure 22 shows the timing diagrams, 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 will remain protected).
2. All previously protected sector groups are protected
once again.
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參數(shù)描述
L640MB10NF 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Boot Sector Flash Memory
L640MB10NI 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Boot Sector Flash Memory
L640MB10PF 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Boot Sector Flash Memory
L640MB10PI 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Boot Sector Flash Memory
L640MB10RF 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit⑩ 3.0 Volt-only Boot Sector Flash Memory
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