S29GL256P90TFCR2 View Datasheet(PDF) - Spansion Inc.

Part Name

Description

Manufacturer

S29GL256P90TFCR2

S29GL-P MirrorBit® Flash Family

Spansion Inc. 

Data Sheet

8. 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 8.1.

Figure 8.1 Advanced Sector Protection/Unprotection

Hardware Methods

Software Methods

WP#/ACC = VIL

(Highest or Lowest

Sector Locked)

Lock Register

(One Time Programmable)

Password Method

(DQ2)

Persistent Method

(DQ1)

64-bit Password

(One Time Protect)

Memory Array

Sector 0

Sector 1

Sector 2

Sector N-2

Sector N-1

Sector N3

4. N = Highest Address Sector.

PPB Lock Bit1,2,3

0 = PPBs Locked 1 = PPBs Unlocked

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.

Persistent

Protection Bit

(PPB)4,5

PPB 0

PPB 1

PPB 2

Dynamic

Protection Bit

(DYB)6,7,8

DYB 0

DYB 1

DYB 2

PPB N-2

PPB N-1

PPB N

5. 0 = Sector Protected,

1 = Sector Unprotected.

6. PPBs programmed individually,

but cleared collectively

DYB N-2

DYB N-1

DYB N

7. 0 = Sector Protected,

1 = Sector Unprotected.

8. Protect effective only if PPB Lock Bit is

unlocked and corresponding PPB is “1”

(unprotected).

9. Volatile Bits: defaults to user choice upon

power-up (see ordering options).

42

S29GL-P MirrorBit® Flash Family

S29GL-P_00_A14 October 22, 2012

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