S29PL-J55BAI011 datasheet(46/96 Pages) SPANSION

46 / 96 page

S29PL-J

S29PL-J_00_A9 September 22, 2006

Data

Sheet

(Adv an ce

Inf o r m a t io n)

The device is shipped with all sectors unprotected. Optional Spansion programming 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 the Table 10.9, Secured Silicon

Sector Addresses on page 39 for details.

11. Sector Protection

The PL127J, PL129J, PL064J, and PL032J features several levels of sector protection, which can disable

both the program and erase operations in certain sectors or sector groups:

11.1

Persistent Sector Protection

A command sector protection method that replaces the old 12 V controlled protection method.

11.2

Password Sector Protection

A highly sophisticated protection method that requires a password before changes to certain sectors or sector

groups are permitted

11.3

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.

11.4

Selecting a Sector Protection Mode

All parts default to operate in the Persistent Sector Protection mode. The customer 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

Persistent Sector Protection Mode into the Password Protection Mode.

The device is shipped with all sectors unprotected. Optional Spansion programming 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 Autoselect Mode on page 39 for

details.

Table 10.15 Sector Protection Schemes

DYB

PPB

PPB Lock

Sector State

Unprotected—PPB and DYB are changeable

Unprotected—PPB not changeable, DYB is changeable

010

Protected—PPB and DYB are changeable

100

110

011

Protected—PPB not changeable, DYB is changeable

101

111

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