S29PL-J55BAI011 datasheet(52/96 Pages) SPANSION

52 / 96 page

S29PL-J

S29PL-J_00_A9 September 22, 2006

Data

Sheet

(Adv an ce

Inf o r m a t io n)

13.5

Temporary Sector Unprotect

This feature allows temporary unprotection of previously protected sectors to change data in-system. The

Sector Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly protected

sectors can be programmed or erased by selecting the sector addresses. Once VID is removed from the

RESET# pin, all the previously protected sectors are protected again. Figure 13.2 on page 50 shows the

algorithm, and Figure 21.1 on page 81 shows the timing diagrams, for this feature. While PPB lock is set, the

device cannot enter the Temporary Sector Unprotection Mode.

Figure 13.2 Temporary Sector Unprotect Operation

Notes:

1. All protected sectors unprotected (If WP#/ACC = VIL, upper two and lower two sectors will remain protected).

2. All previously protected sectors are protected once again

13.6

Secured Silicon Sector Flash Memory Region

The Secured Silicon Sector feature provides a Flash memory region that enables permanent part

identification through an Electronic Serial Number (ESN) The 128-word Secured Silicon sector is divided into

64 factory-lockable words that can be programmed and locked by the customer. The Secured Silicon sector

is located at addresses 000000h-00007Fh in both Persistent Protection mode and Password Protection

mode. Indicator bits DQ6 and DQ7 are used to indicate the factory-locked and customer locked status of the

part.

The system accesses the Secured Silicon Sector through a command sequence (see the Enter/Exit Secured

Silicon Sector Command Sequence on page 56). After the system has written the Enter Secured Silicon

Sector command sequence, it may read the Secured Silicon Sector by using the addresses normally

occupied by the boot sectors. This mode of operation continues until the system issues the Exit Secured

Silicon Sector command sequence, or until power is removed from the device. Once the Enter SecSi Sector

Command sequence has been entered, the standard array cannot be accessed until the Exit SecSi Sector

command has been entered or the device has been reset. On power-up, or following a hardware reset, the

device reverts to sending commands to the normal address space. Note that the ACC function and unlock

bypass modes are not available when the Secured Silicon Sector is enabled.

START

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

RESET# = VID

(Note 1)

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