S29GL128P SPANSION, S29GL128P Datasheet - Page 39

• Manufacturer Part Number: S29GL128P
• Description: Page Mode Flash Memory
• Manufacturer: SPANSION

8.
November 21, 2006 S29GL-P_00_A3
3. N = Highest Address Sector.
Hardware Methods
Advanced Sector Protection/Unprotection
WP#/ACC = V
(Highest or Lowest
Sector Locked)
Memory Array
Sector N-2
Sector N-1
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 methods, 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
Sector N
Sector 0
Sector 1
Sector 2
D a t a
3
IL
S h e e t
Figure 8.1 Advanced Sector Protection/Unprotection
0 = PPBs Locked
( A d v a n c e
S29GL-P MirrorBit
4. 0 = Sector Protected,
5. PPBs programmed individually,
1 = Sector Unprotected.
but cleared collectively
Protection Bit
PPB Lock Bit
Password Method
Persistent
64-bit Password
(One Time Protect)
(PPB)
PPB N-2
PPB N-1
PPB N
PPB 0
PPB 1
PPB 2
I n f o r m a t i o n )
(DQ2)
TM
4,5
Software Methods
1 = PPBs Unlocked
Flash Family
(One Time Programmable)
1,2,3
Lock Register
Figure
Persistent Method
8.1.
6. 0 = Sector Protected,
7. Protect effective only if PPB Lock Bit is
8. Volatile Bits: defaults to user choice upon
(DQ1)
1 = Sector Unprotected.
unlocked and corresponding PPB is “1”
(unprotected).
power-up (see ordering options).
1. Bit is volatile, and defaults to “1” on reset.
2. Programming to “0” locks all PPBs to their
3. Once programmed to “0”, requires hardware
current state.
reset to unlock.
Protection Bit
Dynamic
DYB N-2
DYB N-1
(DYB)
DYB N
DYB 0
DYB 1
DYB 2
6,7,8
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