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Document Number: 001-98285 Rev. *R
Page 16 of 108
S29GL01GS/S29GL512S
S29GL256S/S29GL128S
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 0 Indicator Bit is located in the Lock Register at bit
location 0 and Region 1 in bit location 6.
Table 3.1
Sector Protection States
Protection Bit Values
Sector State
PPB Lock
PPB
DYB
1
1
1
Unprotected - PPB and DYB are changeable
1
1
0
Protected - PPB and DYB are changeable
1
0
1
Protected - PPB and DYB are changeable
1
0
0
Protected - PPB and DYB are changeable
0
1
1
Unprotected - PPB not changeable, DYB is changeable
0
1
0
Protected - PPB not changeable, DYB is changeable
0
0
1
Protected - PPB not changeable, DYB is changeable
0
0
0
Protected - PPB not changeable, DYB is changeable
Table 3.2
Lock Register
Bit
Default Value
Name
15-9
1
Reserved
8
0
Reserved
7
X
Reserved
6
1
SSR Region 1 (Customer) Lock Bit
5
1
Reserved
4
1
Reserved
3
1
Reserved
2
1
Password Protection Mode Lock Bit
1
1
Persistent Protection Mode Lock Bit
0
0
SSR Region 0 (Factory) Lock Bit