參數(shù)資料
型號(hào)： Am29LV320DT90
廠商： Advanced Micro Devices, Inc.
英文描述： 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
中文描述： 32兆位（4個(gè)M × 8位/ 2米x 16位），3.0伏的CMOS只，引導(dǎo)扇區(qū)閃存
文件頁(yè)數(shù)： 18/55頁(yè)
文件大?。?/td> 1258K
代理商： AM29LV320DT90
18
Am29LV320D
November 15, 2004
compatible with programmer routines written
for earlier 3.0 volt-only AMD flash devices. For
detailed information, contact an AMD represen-
tative.
The device is shipped with all sectors unpro-
tected. AMD offers the option of programming
and protecting sectors at its factory prior to
shipping the device through AMD’s Express-
Flash Service. Contact an AMD representative
for details.
It is possible to determine whether a sector is
protected or unprotected. See
“Autoselect
Mode” on page 16
for details.
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting certain boot sectors with-
out using V
ID
. This function is one of two pro-
vided by the WP#/ACC pin.
If the system asserts V
IL
on the WP#/ACC pin,
the device disables program and erase func-
tions in the two “outermost” 8 Kbyte boot sec-
tors independently of whether those sectors
were protected or unprotected using the
method described in
“Sector/Sector Block Pro-
tection and Unprotection” on page 17
. The two
outermost 8 Kbyte boot sectors are the two
sectors containing the lowest addresses in a
bottom-boot-configured device, or the two sec-
tors containing the highest addresses in a
top-boot-configured device.
If the system asserts V
IH
on the WP#/ACC pin,
the device reverts to whether the two outer-
most 8K Byte boot sectors were last set to be
protected or unprotected. That is, sector pro-
tection or unprotection for these two sectors
depends on whether they were last protected
or unprotected using the method described in
“Sector/Sector Block Protection and Unprotec-
tion” on page 17
.
Note that the WP#/ACC pin must not be left
floating or unconnected; inconsistent behavior
of the device may result.
Temporary Sector Unprotect
This feature allows temporary unprotection of
previously protected sectors to change data
in-system. The Sector Unprotect mode is acti-
vated by setting the RESET# pin to V
ID
(11.5 V
– 12.5 V). During this mode, formerly pro-
tected sectors can be programmed or erased by
selecting the sector addresses. Once V
ID
is re-
moved from the RESET# pin, all the previously
protected sectors are protected again.
Figure 1,
on page 18
shows the algorithm, and
Figure
23, on page 46
shows the timing diagrams, for
this feature.
Figure 1.
Temporary Sector Unprotect
Operation
START
Perform Erase or
Program
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected (If WP#/ACC =
V
IL
, outermost boot sectors remain protected).
2. All previously protected sectors are protected
once again.
相關(guān)PDF資料
PDF描述
AM29LV320DT90EC 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
Am29LV320DT90ED 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
Am29LV320DT90EF 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
AM29LV320DT90EI 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Boot Sector Flash Memory
AM29LV320MB90RE 16-Bit Buffer/Drivers With 3-State Outputs 48-CFP -55 to 125
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參數(shù)描述
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AM29LV320DT90EI 制造商:Advanced Micro Devices 功能描述:
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AM29LV320MB100EI 制造商:Advanced Micro Devices 功能描述:
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