S29GL01GS datasheet(21/104 Pages) SPANSION

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March 16, 2012 S29GL_128S_01GS_00_06

GL-S MirrorBit® Family

Data

She e t

3.4.6

Sector Protection States Summary

Each sector can be in one of the following protection states:

 Unlocked – The sector is unprotected and protection can be changed by a simple command. The

protection state defaults to unprotected after a power cycle or hardware reset.

 Dynamically Locked – A sector is protected and protection can be changed by a simple command. The

protection state is not saved across a power cycle or hardware reset.

 Persistently Locked – A sector is protected and protection can only be changed if the PPB Lock Bit is set to

1. The protection state is non-volatile and saved across a power cycle or hardware reset. Changing the

protection state requires programming or erase of the PPB bits.

3.4.7

Lock Register

The Lock Register holds the non-volatile OTP bits for controlling protection of the SSR, and determining the

PPB Lock bit management method (protection mode).

The Secure Silicon Region (SSR) protection bits must be used with caution, as once locked, there is no

procedure available for unlocking the protected portion of the Secure Silicon Region and none of the bits in

the protected Secure Silicon Region memory space can be modified in any way. Once the Secure Silicon

Region area is protected, any further attempts to program in the area will fail with status indicating the area

being programmed is protected. The Region 1 Indicator Bit is located in the Lock Register at bit location 0 and

Region 2 in bit location 6.

As shipped from the factory, all devices default to the Persistent Protection method, with all sectors

unprotected, when power is applied. The device programmer or host system can then choose which sector

protection method to use. Programming either of the following two, one-time programmable, non-volatile bits,

locks the part permanently in that mode:

 Persistent Protection Mode Lock Bit (DQ1)

 Password Protection Mode Lock Bit (DQ2)

Table 3.1 Sector Protection States

Protection Bit Values

Sector State

PPB Lock

PPB

DYB

Unprotected - PPB and DYB are changeable

Protected - PPB and DYB are changeable

Unprotected - PPB not changeable, DYB is changeable

Protected - PPB not changeable, DYB is changeable

Table 3.2 Lock Register

Bit

Default Value

Name

15-9

Reserved

SSR Region 1 (Customer) Lock Bit

Reserved

Password Protection Mode Lock Bit

Persistent Protection Mode Lock Bit

SSR Region 0 (Factory) Lock Bit

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