AM29LV033C datasheet(15/48 Pages) AMD

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Am29LV033C

Table 4.

Sector Block Addresses for

Protection/Unprotection

Temporary Sector/Sector Block Unprotect

(Note: For the following discussion, the term “sector”

applies to both sectors and sector blocks. A sector

block consists of two or more adjacent sectors that are

protected or unprotected at the same time (see Table

4).

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system. The

Sector Unprotect mode is activated by setting the RE-

SET# pin to V

ID. During this mode, formerly protected

sectors can be programmed or erased by selecting the

sector addresses. Once V

ID is removed from the RE-

SET# pin, all the previously protected sectors are

protected again. Figure 1 shows the algorithm, and

Figure 21 shows the timing diagrams, for this feature.

Figure 1.

Temporary Sector Unprotect Operation

Sector/

Sector Block

A21–A16

Sector/

Sector Block Size

SA0

000000

64 Kbytes

SA1-SA3

000001,000010,

000011

192 (3x64) Kbytes

SA4-SA7

000100, 000101,

000110, 000111

256 (4x64) Kbytes

SA8-SA11

001000, 001001,

001010, 001011

256 (4x64) Kbytes

SA12-SA15

001100, 001101,

001110, 001111

256 (4x64) Kbytes

SA16-SA19

010000, 010001,

010010, 010011

256 (4x64) Kbytes

SA20-SA23

010100, 010101,

010110, 010111

256 (4x64) Kbytes

SA24-SA27

011000, 011001,

011010, 011011

256 (4x64) Kbytes

SA28-SA31

011100, 011101,

011110, 011111

256 (4x64) Kbytes

SA32-SA35

100000, 100001,

100010, 100011

256 (4x64) Kbytes

SA36-SA39

100100, 100101,

100110, 100111

256 (4x64) Kbytes

SA40-SA43

101000, 101001,

101010, 101011

256 (4x64) Kbytes

SA44-SA47

101100, 101101,

101110, 101111

256 (4x64) Kbytes

SA48-SA51

110000, 110001,

110010, 110011

256 (4x64) Kbytes

SA52-SA55

110100, 110101,

110110, 110111

256 (4x64) Kbytes

SA56-SA59

111000, 111001,

111010, 111011

256 (4x64) Kbytes

SA60-SA62

111100, 111101,

111110

192 (4x64) Kbytes

SA63

111111

64 Kbytes

START

Perform Erase or

Program Operations

RESET# = V

Temporary Sector

Unprotect Completed

(Note 2)

RESET# = V

(Note 1)

Notes:

1. All protected sectors unprotected.

2. All previously protected sectors are protected once

again.

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