S29AL008J70BFI020 datasheet(20/54 Pages) SPANSION

Part #	S29AL008J70BFI020

Description	8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

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S29AL008J

S29AL008J_00_11 April 12, 2012

Da ta

Sh e e t

7.11

Temporary Sector Group Unprotect

This feature allows temporary unprotection of previously protected sector groups to change data in-system.

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

protected sector groups can be programmed or erased by selecting the sector addresses. Once VID is

removed from the RESET# pin, all the previously protected sector groups are protected again. Figure 7.1

shows the algorithm, and Figure 17.11 on page 47 shows the timing diagrams, for this feature.

Figure 7.1 Temporary Sector Group Unprotect Operation

Notes

1. All protected sector groups unprotected. (If WP# = VIL, the highest or lowest address sector remains protected for uniform sector devices;

the top or bottom two address sectors remains protected for boot sector devices).

2. All previously protected sector groups are protected once again.

START

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector Group

Unprotect Completed

(Note 2)

RESET# = VID

(Note 1)

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