S29PL032J SPANSION [SPANSION], S29PL032J Datasheet - Page 52

• Manufacturer Part Number: S29PL032J
• Description: CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory with Enhanced VersatileIO Control
• Manufacturer: SPANSION [SPANSION]

Sector Protection
50
DYB
0
0
0
1
1
0
1
1
Persistent Sector Protection
Password Sector Protection
WP# Hardware Protection
Selecting a Sector Protection Mode
The PL127J, PL129J, PL064J, and PL032J features several levels of sector protec-
tion, which can disable both the program and erase operations in certain sectors
or sector groups:
A command sector protection method that replaces the old 12 V controlled pro-
tection method.
A highly sophisticated protection method that requires a password before
changes to certain sectors or sector groups are permitted
A write protect pin that can prevent program or erase operations in sectors
SA1-133, SA1-134, SA2-0 and SA2-1.
The WP# Hardware Protection feature is always available, independent of the
software managed protection method chosen.
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 Sector 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 selected when the device is first
programmed. This prevents a program or virus from later setting the Password
Mode Locking Bit, which would cause an unexpected shift from the default Per-
sistent Sector Protection Mode into the Password Protection Mode.
PPB
0
0
1
0
1
1
0
1
Table 16. Sector Protection Schemes
S29PL127J/S29PL129J/S29PL064J/S29PL032J
PPB Lock
0
1
0
0
0
1
1
1
P R E L I M I N A R Y
Unprotected—PPB not changeable, DYB is changeable
Protected—PPB not changeable, DYB is changeable
Unprotected—PPB and DYB are changeable
Protected—PPB and DYB are changeable
Sector State
31107A62 April 7, 2005