S71PL129JC0 Datasheet, PDF (32/149 Pages) SPANSION – Stacked Multi-Chip Product (MCP) Flash Memory

Advance Information
Selecting a Sector Protection Mode
The device is shipped with all sectors unprotected. Optional Spansion program-
ming services enable programming and protecting sectors at the factory prior to
shipping the device. Contact your local sales office for details.
It is possible to determine whether a sector is protected or unprotected. See “Se-
cured Silicon Sector Addresses” on page 29 for details.
DYB
0
0
0
1
1
0
1
1
PPB
0
0
1
0
1
1
0
1
Table 7. Sector Protection Schemes
PPB Lock
0
1
0
0
0
1
1
1
Sector State
Unprotected—PPB and DYB are changeable
Unprotected—PPB not changeable, DYB is changeable
Protected—PPB and DYB are changeable
Protected—PPB not changeable, DYB is changeable
Sector Protection
The PL129J 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 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.
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 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
32
S29PL129J for MCP
S29PL129J_MCP_00_A0 June 4, 2004