S75WS256NDFBAWMB datasheet(54/216 Pages) SPANSION

54 / 216 page

S75WS256Nxx Based MCPs

S75WS-N-00_A0 February 17, 2005

Ad van c e

Inf o rmation

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 9.1.

Figure 9.1 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

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.

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