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參數(shù)資料
| 型號： | AM29LV256MH128EI |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | PROM |
| 英文描述： | 16M X 16 FLASH 3V PROM, 120 ns, PDSO56 |
| 封裝： | TSOP-56 |
| 文件頁數(shù)： | 18/63頁 |
| 文件大?。?/td> | 1515K |
| 代理商： | AM29LV256MH128EI |
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September 9, 2002
Am29LV256M
25
A D VA NCE
I N FO RM ATIO N
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the first or last sector without
using VID. 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 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 in-
creased. 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 Protection and Unprotec-
tion”. Note that WP# has an internal pullup; when un-
connected, WP# is at V
IH..
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to V
ID. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once V
ID is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 1 shows the algorithm, and
Figure 22 shows the timing diagrams, for this feature.
Figure 1.
Temporary Sector Unprotect Operation
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected (If WP# = V
IL, the first
or last sector will remain protected).
2. All previously protected sectors are protected once
again.
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