S29GL01GS10DFIV13 datasheet(14/108 Pages) CYPRESS

14 / 108 page

Document Number: 001-98285 Rev. *R

Page 14 of 108

S29GL01GS/S29GL512S

S29GL256S/S29GL128S

3.4

Sector Protection Methods

3.4.1

Write Protect Signal

If WP# = VIL, the lowest or highest address sector is protected from program or erase operations independent of any other ASP

configuration. Whether it is the lowest or highest sector depends on the device ordering option (model) selected. If WP# = VIH, the

lowest or highest address sector is not protected by the WP# signal but it may be protected by other aspects of ASP configuration.

WP# has an internal pull-up; when unconnected, WP# is at VIH.

3.4.2

ASP

Advanced Sector Protection (ASP) is a set of independent hardware and software methods used to disable or enable programming

or erase operations, individually, in any or all sectors. This section describes the various methods of protecting data stored in the

memory array. An overview of these methods is shown in Figure 3.1.

Figure 3.1 Advanced Sector Protection Overview

Every main flash array sector has a non-volatile (PPB) and a volatile (DYB) protection bit associated with it. When either bit is 0, the

sector is protected from program and erase operations.

The PPB bits are protected from program and erase when the PPB Lock bit is 0. There are two methods for managing the state of

the PPB Lock bit, Persistent Protection and Password Protection.

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)

5,6

DYB 0

DYB 1

DYB 2

DYB N-2

DYB N-1

DYB N

Dynamic

Protection Bit

(DYB)

7,8,9

7. 0 = Sector Protected,

1 = Sector Unprotected.

8. Protect effective only if 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 (to

“0” if in Password Mode).

2. Programming to “0” locks all PPBs to their

current state.

3. Once programmed to “0”, requires hardware

reset to unlock or application of the

password.

4. N = Highest Address Sector.

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