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| 型號(hào)： | S29NS-P |
| 廠商： | Spansion Inc. |
| 英文描述： | MirrorBit Flash Family |
| 中文描述： | MirrorBit閃存系列 |
| 文件頁(yè)數(shù)： | 52/86頁(yè) |
| 文件大?。?/td> | 2234K |
| 代理商： | S29NS-P |
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52
S29NS-P MirrorBit
TM
Flash Family
S29NS-P_00_A1 February 20, 2007
D a t a
S h e e t
( A d v a n c e
I n f o r m a t i o n )
7.
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 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
Figure 7.1
.
Figure 7.1
Advanced Sector Protection/Unprotection
7.1
Lock Register
The Lock Register consists of 5 bits. The Secured Silicon Sector Protection Bit is DQ0, Persistent Protection
Mode Lock Bit is DQ1, Password Protection Mode Lock Bit is DQ2, Persistent Sector Protection OTP bit is
DQ3 and Volatile Sector Protection Boot bit is DQ4. If DQ0 is
0
, it means that the Customer Secured Silicon
area is locked and if DQ0 is
1
, it means that it is unlocked. When DQ2 is set to
1
and DQ1 is set to
0
, the
Hardware Methods
Software Methods
V
PP
= 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
(DYB)
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 protected
after power up.
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.
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