S29GL01GP datasheet(37/82 Pages) CYPRESS

37 / 82 page

Document Number: 002-00886 Rev. *B

Page 37 of 83

S29GL01GP

S29GL512P

S29GL256P

S29GL128P

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)

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

(DYB)

6,7,8

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).

5. 0 = Sector Protected,

1 = Sector Unprotected.

6. 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.

4. N = Highest Address Sector.

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