參數(shù)資料
型號: AM29LV320MB100RPC
廠商: Advanced Micro Devices, Inc.
英文描述: 32 Megabit (2 M x 16-Bit/4 M x 8-Bit) MirrorBit 3.0 Volt-only Boot Sector Flash Memory
中文描述: 32兆位(2米× 16位/ 4米× 8位)的MirrorBit 3.0伏,只引導(dǎo)扇區(qū)閃存
文件頁數(shù): 18/61頁
文件大?。?/td> 1395K
代理商: AM29LV320MB100RPC
18
Am29LV320MT/B
May 16, 2003
D A T A S H E E T
If the system asserts V
IH
on the WP#/ACC pin, the de-
vice reverts to whether the top or bottom two sectors
were previously set to be protected or unprotected
using the method described in “Sector Group Protec-
tion and Unprotection”.
Note: No external pullup is
necessary since the WP#/ACC pin has internal pullup
to V
CC
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 6
).
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
. During this mode, for-
merly 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 previ-
ously protected sector groups are protected again.
Figure 1 shows the algorithm, and Figure 23 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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