参数资料
型号: S29GL032N90BFI32
厂商: SPANSION LLC
元件分类: PROM
英文描述: 2M X 16 FLASH 3V PROM, 90 ns, PBGA48
封装: 8.15 X 6.15 MM, LEAD FREE, FBGA-48
文件页数: 24/81页
文件大小: 3095K
代理商: S29GL032N90BFI32
30
S29GL-N MirrorBit Flash Family
S29GL-N_01_12 October 29, 2008
Da ta
Sh e e t
8.9
Advanced Sector Protection
The device features several levels of sector protection, which can disable both the program and erase
operations in certain sectors:
8.9.1
Persistent Sector Protection
A command sector protection method that replaces the old 12 V controlled protection method.
8.9.2
Password Sector Protection
A highly sophisticated protection method that requires a password before changes to certain sectors are
permitted
8.9.3
WP# Hardware Protection
A write protect pin that can prevent program or erase operations in the outermost sectors.
The WP# Hardware Protection feature is always available, independent of the software managed protection
method chosen.
8.9.4
Selecting a Sector Protection Mode
All parts default to operate in the Persistent Sector Protection mode. The user 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 is used. If the user decides to continue using the
Persistent Sector Protection method, they must set the Persistent Sector Protection Mode Locking Bit.
This permanently sets the part to operate only using Persistent Sector Protection. If the user decides to use
the password method, they must set the Password Mode Locking Bit. This permanently sets the part to
operate only using password sector protection.
It is important to remember that setting either the Persistent Sector Protection Mode Locking Bit or the
Password Mode Locking Bit permanently selects the protection mode. It is not possible to switch between
the two methods once a locking bit is set. It is important that one mode is explicitly selected when the
device is first programmed, rather than relying on the default mode alone. This is so that it is not
possible for a system program or virus to later set the Password Mode Locking Bit, which would cause an
unexpected shift from the default Persistent Sector Protection Mode into the Password Protection Mode.
The device is shipped with all sectors unprotected. Spansion offers the option of programming and protecting
sectors at the factory prior to shipping the device through the ExpressFlash Service. Contact your sales
representative for details.
It is possible to determine whether a sector is protected or unprotected. See Autoselect Command Sequence
on page 42 for details.
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