S29PL-N datasheet(45/74 Pages) SPANSION

45 / 74 page

June 6, 2007 S29PL-N_00_A5

S29PL-N MirrorBit

™ Flash Family

Da ta

Shee t

(Prelim i nar y )

8.1

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 Ordering Information

on page 9). The device programmer or host system must then choose which sector protection method to use.

Programming (setting to 0) any one of the following two one-time programmable, non-volatile bits locks the

part permanently in that mode:

Lock Register Persistent Protection Mode Lock Bit (DQ1)

Lock Register Password Protection Mode Lock Bit (DQ2)

For programming lock register bits see Table 12.2 on page 68.

Notes

1. If the password mode is chosen, the password must be programmed before setting the

corresponding lock register bit.

2. After the Lock Register Bits Command Set Entry command sequence is written, reads and writes

for Bank A are disabled, while reads from other banks are allowed until exiting this mode.

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

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.

After selecting a sector protection method, each sector can operate in any of the following three states:

1. Constantly locked. The selected sectors are protected and cannot be reprogrammed unless PPB

lock bit is cleared via a password, hardware reset, or power cycle.

2. Dynamically locked. The selected sectors are protected and can be altered via software

commands.

3. Unlocked. The sectors are unprotected and can be erased and/or programmed.

These states are controlled by the bit types described in Sections 8.2 – 8.6.

Table 8.1 Lock Register

Device

DQ15 – 05

DQ4

DQ3

DQ2

DQ1

DQ0

S29PL256N

Undefined

DYB Lock Boot Bit

0 = sectors

power up

protected

1 = sectors

power up

unprotected

PPB One-Time

Programmable Bit

0 = All PPB erase

command disabled

1 = All PPB Erase

command enabled

Password

Protection

Mode Lock Bit

Persistent

Protection

Mode Lock Bit

Secured

Silicon Sector

Protection Bit

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