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S71WS512NC0BFWE73 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 57 Page - SPANSION

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September 15, 2005 S71WS-N_01_A4
S71WS-Nx0 Based MCPs
55
Advance
Information
11 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
11.1.
Figure 11.1 Advanced Sector Protection/Unprotection
Hardware Methods
Software Methods
ACC = VIL
(All sectors locked)
WP# = VIL
(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 โ€œ1โ€ (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 โ€œ1โ€ on
reset.
2. Programming to โ€œ0โ€ locks all PPBs to
their current state.
3. Once programmed to โ€œ0โ€, requires
hardware reset to unlock.
3. N = Highest Address Sector.


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