s71ws256nc0bawa30 Meet Spansion Inc., s71ws256nc0bawa30 Datasheet - Page 57

• Manufacturer Part Number: s71ws256nc0bawa30
• Description: Stacked Multi-chip Product Mcp 256/512/128 Megabit 32m/16m/8m X 16 Bit Cmos 1.8 Volt-only Simultaneous Read/write, Burst-mode Flash Memory With 128/64megabit 8m/4m X 16-bit Psram.
• Manufacturer: Meet Spansion Inc.

11 Advanced Sector Protection/Unprotection
September 15, 2005 S71WS-N_01_A4
Hardware Methods
3. N = Highest Address Sector.
(
Memory Array
All sectors locked)
sectors locked)
WP# = V
ACC = V
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
11.1.
Sector N-2
Sector N-1
(All boot
Sector N
Sector 0
Sector 1
Sector 2
IL
IL
3
A d v a n c e
Figure 11.1 Advanced Sector Protection/Unprotection
0 = PPBs Locked
4. 0 = Sector Protected,
5. PPBs programmed individually,
I n f o r m a t i o n
1 = Sector Unprotected.
but cleared collectively
S71WS-Nx0 Based MCPs
Protection Bit
PPB Lock Bit
64-bit Password
Persistent
Password Method
(One Time Protect)
(PPB)
PPB N-2
PPB N-1
PPB N
PPB 0
PPB 1
PPB 2
Software Methods
(DQ2)
1 = PPBs Unlocked
4,5
(One Time Programmable)
Lock Register
1,2,3
Persistent Method
6. 0 = Sector Protected,
7. Protect effective only if PPB Lock Bit
8. Volatile Bits: defaults to user choice
(DQ1)
1 = Sector Unprotected.
is unlocked and corresponding PPB
is “1” (unprotected).
upon power-up (see ordering
options).
1. Bit is volatile, and defaults to “1” on
2. Programming to “0” locks all PPBs to
3. Once programmed to “0”, requires
Protection Bit
reset.
their current state.
hardware reset to unlock.
Dynamic
(DYB)
DYB N-2
DYB N-1
DYB N
DYB 0
DYB 1
DYB 2
6,7,8
Figure
55