S70GL01GN00 Datasheet, PDF (31/83 Pages) SPANSION – 3.0 Volt-only Page Mode Flash Memory featuring 110 nm MirrorBit™ Process Technology

Advance Information
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 the outermost
sectors.
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 is used. If the customer 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 customer 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 Protec-
tion 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. The factory 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 40 for details.
Advanced Sector Protection
Advanced Sector Protection features several levels of sector protection, which can
disable both the program and erase operations in certain sectors.
Persistent Sector Protection is a method that replaces the old 12V controlled
protection method.
Password Sector Protection is a highly sophisticated protection method that
requires a password before changes to certain sectors are permitted.
Lock Register
The Lock Register consists of three bits (DQ2, DQ1, and DQ0). These DQ2, DQ1,
DQ0 bits of the Lock Register are programmable by the user. Users are not al-
lowed to program both DQ2 and DQ1 bits of the Lock Register to the 00 state. If
the user tries to program DQ2 and DQ1 bits of the Lock Register to the 00 state,
the device aborts the Lock Register back to the default 11 state. The program-
ming time of the Lock Register is same as the typical word programming time
June 1, 2005 S70GL01GN00_00_A1
S70GL01GN00 MirrorBit^TM Flash
29