參數(shù)資料
型號： S71PL191HB0BFI100
廠商： SPANSION LLC
元件分類： 存儲器
英文描述： SPECIALTY MEMORY CIRCUIT, PBGA73
封裝： 9 X 13 MM, LEAD FREE, FBGA-73
文件頁數(shù)： 116/172頁
文件大?。?/td> 4662K
代理商： S71PL191HB0BFI100
32
S29PL127H/S29PL129H
S29PL127H_129H_00A1 May 7, 2004
Pr el i m i n ary
Sector Protection
The S29PL127H/S29PL129H features several levels of sector protection, which
can disable both the program and erase operations in certain sectors or sector
groups:
Persistent Sector Protection
A command sector protection method that replaces the old 12 V controlled pro-
tection method.
Password Sector Protection
A highly sophisticated protection method that requires a password before
changes to certain sectors or sector groups are permitted
WP# Hardware Protection
A write protect pin that can prevent program or erase operations in sectors 0, 1,
268, and 269 (S29PL127H); or sectors SA1-133, SA1-134, SA2-0, SA2-1
(S29PL129H).
The WP# Hardware Protection feature is always available, independent of the
software managed protection method chosen.
Selecting a Sector Protection Mode
All parts default to operate in the Persistent Sector Protection mode. The cus-
tomer must then choose if the Persistent or Password Protection method is most
desirable. There are two one-time programmable non-volatile bits that define
which sector protection method will be used. If the Persistent Sector Protection
method is desired, programming the Persistent Sector Protection Mode
Locking Bit permanently sets the device to the Persistent Sector Protection
mode. If the Password Sector Protection method is desired, programming the
Password Mode Locking Bit permanently sets the device to the Password Sec-
tor Protection mode. It is not possible to switch between the two protection
modes once a locking bit has been set. One of the two modes must be se-
lected when the device is first programmed. This prevents a program or
virus from later setting the Password Mode Locking Bit, which would cause an un-
expected shift from the default Persistent Sector Protection Mode into the
Password Protection Mode.
The device is shipped with all sectors unprotected. Optional Spansion program-
ming services enable and protecting sectors at the factory prior to shipping the
device. Contact the local sales office for details.
It is possible to determine whether a sector is protected or unprotected.
Persistent Sector Protection
The Persistent Sector Protection method replaces the 12 V controlled protection
method in previous AMD flash devices. This new method provides three different
sector protection states:
Persistently Locked—The sector is protected and cannot be changed.
Dynamically Locked—The sector is protected and can be changed by a sim-
ple command.
Unlocked—The sector is unprotected and can be changed by a simple com-
mand.
To achieve these states, three types of “bits” are used:
Persistent Protection Bit (PPB)
A single Persistent (non-volatile) Protection Bit is assigned to a maximum four
sectors (see the sector address tables for specific sector protection groupings).
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