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參數(shù)資料
| 型號(hào)： | AM29LV640MH101EF |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 4M X 16 FLASH 3V PROM, 100 ns, PDSO56 |
| 封裝： | MO-142B, TSOP-56 |
| 文件頁數(shù)： | 10/59頁 |
| 文件大小： | 1590K |
| 代理商： | AM29LV640MH101EF |
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18
Am29LV640MH/L
February 16, 2003
ADV ANCE
I N FO RMAT 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. Write Protect is one of two functions pro-
vided by the WP#/ACC input.
If the system asserts V
IL on the WP#/ACC pin, the de-
vice 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#/ACC 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”.
If the system asserts V
IH on the WP#/ACC pin, the de-
vice reverts to whether the first or last sector was pre-
viously set to be protected or unprotected using the
method described in “Sector Group Protection and Un-
protection”. 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 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. 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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