S71PL129JC0 datasheet(39/149 Pages) SPANSION

39 / 149 page

June 4, 2004 S29PL129J_MCP_00_A0

S29PL129J for MCP

Advance

Informatio n

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 pro-

grammed or erased by selecting the sector addresses. Once VID is removed from

the RESET# pin, all the previously protected sectors are protected again.

Figure 2 shows the algorithm, and Figure 21 shows the timing diagrams, for this

feature. While PPB lock is set, the device cannot enter the Temporary Sector Un-

protection Mode.

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 “Enter Secured Silicon Sector/Exit Secured Silicon Sector Command Se-

quence” on page 46). 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 contin-

ues until the system issues the Exit Secured Silicon Sector command sequence,

or until power is removed from the device. 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 Se-

cured Silicon Sector is enabled.

Notes:

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

two sectors remain protected).

2. All previously protected sectors are protected once again

Figure 2. Temporary Sector Unprotect Operation

START

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

RESET# = VID

(Note 1)

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