S29AL016 데이터 시트보기 (PDF) - Spansion Inc.

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S29AL016

16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

Spansion Inc. 

Data Sheet

7.11

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 7.1 shows the algorithm, and

Figure 17.11 on page 46 shows the timing diagrams, for this feature.

Figure 7.1 Temporary Sector Unprotect Operation

START

RESET# = VID

(Note 1)

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

Notes

1. All protected sectors unprotected.

2. All previously protected sectors are protected once again.

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S29AL016D

S29AL016D_00_A8 February 27, 2009

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