May 11, 2006 S29WS-J_00_A6 S29WS128J/064J 23
Data Sheet
Advanced Sector Protection/Unprotection
The Advanced Sector Protection/Unprotection feature disables or enables programming or erase
operations in any or all sectors and can be implemented through software and/or hardware meth
-
ods, which are independent of each other. This section describes the various methods of
protecting data stored in the memory array. An overview of these methods in shown in
Figure 1.
Figure 1. Advanced Sector Protection/Unprotection
Hardware Methods Software Methods
ACC = V
IL
(All sectors locked)
WP# = V
IL
(All boot
sectors locked)
Password Method
(DQ2)
Persistent Method
(DQ1)
Lock Register
(One Time Programmable)
PPB Lock Bit
1,2,3
64-bit Password
(One Time Protect)
1 = PPBs Unlocked
0 = PPBs Locked
Memory Array
Sector 0
Sector 1
Sector 2
Sector N-2
Sector N-1
Sector N
3
PPB 0
PPB 1
PPB 2
PPB N-2
PPB N-1
PPB N
Persistent
Protection Bit
(PPB)
4,5
DYB 0
DYB 1
DYB 2
DYB N-2
DYB N-1
DYB N
Dynamic
Protection Bit
(PPB)
6,7,8
6. 0 = Sector Protected,
1 = Sector Unprotected.
7. Protect effective only if PPB Lock Bit
is unlocked and corresponding PPB
is “1” (unprotected).
8. Volatile Bits: defaults to user choice
upon power-up (see ordering
options).
4. 0 = Sector Protected,
1 = Sector Unprotected.
5. PPBs programmed individually,
but cleared collectively
1. Bit is volatile, and defaults to “1” on
reset.
2. Programming to “0” locks all PPBs to
their current state.
3. Once programmed to “0”, requires
hardware reset to unlock.
3. N = Highest Address Sector.
