S29AL032D90TFE040 datasheet(26/69 Pages) SPANSION

Part #	S29AL032D90TFE040

Description	32 Megabit CMOS 3.0 Volt-only Flash Memory

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24

S29AL032D

S29AL032D_00_A3 June 13, 2005

Advan ce

In form ati o n

Temporary Sector Unprotect

This feature allows temporary unprotection of previously protected sectors to change data in-sys-

tem. 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.

shows the algorithm, and Figure 24, on page 58 shows the timing diagrams, for this feature.

Figure 1. Temporary Sector Unprotect Operation

START

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

RESET# = VID

(Note 1)

Notes:

1. All protected sectors unprotected.

2. All previously protected sectors are protected once

again.

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