S29CD032J datasheet(40/76 Pages) SPANSION

40 / 76 page

S29CD-J & S29CL-J Flash Family

S29CD-J_CL-J_00_B1 September 27, 2006

Data

Sheet

(Pre limin ar y)

Figure 9.1 Advanced Sector Protection/Unprotection

9.1

Advanced Sector Protection Overview

As shipped from the factory, all devices default to the persistent mode when power is applied, and all sectors

are unprotected. The device programmer or host system must then choose which sector protection method to

use. Programming (setting to “0”) any one of the following two one-time programmable, non-volatile bits locks

the device permanently in that mode:

Persistent Protection Mode Lock Bit

Password Protection Mode Lock Bit

After selecting a sector protection method, each sector can operate in any of the following three states:

Hardware MethodsSoftware Methods

WP# = VIL

(Two outermost sectors

locked in large bank)

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

5. Protect effective only if PPB Lock Bit is

unlocked and corresponding PPB is “0”

(unprotected).

6. Volatile Bits.

4. 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.

Password Method

(DQ2)

Persistent Method

(DQ1)

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