S29PL-N_07 SPANSION [SPANSION], S29PL-N_07 Datasheet - Page 45

• Manufacturer Part Number: S29PL-N_07
• Description: 256/128/128 Mb (16/8/8 M x 16-Bit) CMOS, 3.0 Volt-only Simultaneous Read/Write, Page-Mode Flash Memory
• Manufacturer: SPANSION [SPANSION]

8.1
June 6, 2007 S29PL-N_00_A5
Lock Register
As shipped from the factory, all devices default to the persistent mode when power is applied, and all sectors
are unprotected, unless otherwise chosen through the DYB ordering option (see
on page
Programming (setting to 0) any one of the following two one-time programmable, non-volatile bits locks the
part permanently in that mode:
For programming lock register bits see
Notes
After selecting a sector protection method, each sector can operate in any of the following three states:
These states are controlled by the bit types described in Sections
S29PL256N
Lock Register Persistent Protection Mode Lock Bit (DQ1)
Lock Register Password Protection Mode Lock Bit (DQ2)
Device
1. If the password mode is chosen, the password must be programmed before setting the
2. After the Lock Register Bits Command Set Entry command sequence is written, reads and writes
3. If both lock bits are selected to be programmed (to zeros) at the same time, the operation aborts.
4. Once the Password Mode Lock Bit is programmed, the Persistent Mode Lock Bit is permanently
1. Constantly locked. The selected sectors are protected and cannot be reprogrammed unless PPB
2. Dynamically locked. The selected sectors are protected and can be altered via software
3. Unlocked. The sectors are unprotected and can be erased and/or programmed.
corresponding lock register bit.
for Bank A are disabled, while reads from other banks are allowed until exiting this mode.
disabled, and no changes to the protection scheme are allowed. Similarly, if the Persistent Mode
Lock Bit is programmed, the Password Mode is permanently disabled.
lock bit is cleared via a password, hardware reset, or power cycle.
commands.
9). The device programmer or host system must then choose which sector protection method to use.
D a t a
DQ15 – 05
Undefined
S h e e t
DYB Lock Boot Bit
unprotected
S29PL-N MirrorBit
0 = sectors
1 = sectors
protected
power up
power up
DQ4
( P r e l i m i n a r y )
Table 12.2 on page
Table 8.1 Lock Register
command disabled
command enabled
Programmable Bit
1 = All PPB Erase
0 = All PPB erase
™
PPB One-Time
Flash Family
DQ3
68.
Mode Lock Bit
8.2
Protection
Password
DQ2
– 8.6.
Mode Lock Bit
Ordering Information
Persistent
Protection
DQ1
Silicon Sector
Protection Bit
Secured
DQ0
45