AM29DL640G datasheet(16/52 Pages) AMD

16 / 52 page

Am29DL640G

June 7, 2002

PR E L I M I N A R Y

Sector/Sector Block Protection and

Unprotection

(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

6).

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both pro-

gram and erase operations in previously protected

sectors. Sector protection/unprotection can be imple-

mented via two methods.

Table 6.

Am29DL640G Boot Sector/Sector Block

Addresses for Protection/Unprotection

The primary method requires V

ID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 2 shows the algo-

rithms and Figure 25 shows the timing diagram. This

method uses standard microprocessor bus cycle tim-

ing. For sector unprotect, all unprotected sectors must

first be protected prior to the first sector unprotect write

cycle. Note that the sector unprotect algorithm unpro-

tects all sectors in parallel. All previously protected

sectors must be individually re-protected. To change

data in protected sectors efficiently, the temporary

sector unprotect function is available. See “Temporary

Sector Unprotect”.

Sector

A21–A12

Sector/

Sector Block Size

SA0

0000000000

8 Kbytes

SA1

0000000001

8 Kbytes

SA2

0000000010

8 Kbytes

SA3

0000000011

8 Kbytes

SA4

0000000100

8 Kbytes

SA5

0000000101

8 Kbytes

SA6

0000000110

8 Kbytes

SA7

0000000111

8 Kbytes

SA8–SA10

0000001XXX,

0000010XXX,

0000011XXX,

192 (3x64) Kbytes

SA11–SA14

00001XXXXX

256 (4x64) Kbytes

SA15–SA18

00010XXXXX

256 (4x64) Kbytes

SA19–SA22

00011XXXXX

256 (4x64) Kbytes

SA23–SA26

00100XXXXX

256 (4x64) Kbytes

SA27-SA30

00101XXXXX

256 (4x64) Kbytes

SA31-SA34

00110XXXXX

256 (4x64) Kbytes

SA35-SA38

00111XXXXX

256 (4x64) Kbytes

SA39-SA42

01000XXXXX

256 (4x64) Kbytes

SA43-SA46

01001XXXXX

256 (4x64) Kbytes

SA47-SA50

01010XXXXX

256 (4x64) Kbytes

SA51-SA54

01011XXXXX

256 (4x64) Kbytes

SA55–SA58

01100XXXXX

256 (4x64) Kbytes

SA59–SA62

01101XXXXX

256 (4x64) Kbytes

SA63–SA66

01110XXXXX

256 (4x64) Kbytes

SA67–SA70

01111XXXXX

256 (4x64) Kbytes

SA71–SA74

10000XXXXX

256 (4x64) Kbytes

SA75–SA78

10001XXXXX

256 (4x64) Kbytes

SA79–SA82

10010XXXXX

256 (4x64) Kbytes

SA83–SA86

10011XXXXX

256 (4x64) Kbytes

SA87–SA90

10100XXXXX

256 (4x64) Kbytes

SA91–SA94

10101XXXXX

256 (4x64) Kbytes

SA95–SA98

10110XXXXX

256 (4x64) Kbytes

SA99–SA102

10111XXXXX

256 (4x64) Kbytes

SA103–SA106

11000XXXXX

256 (4x64) Kbytes

SA107–SA110

11001XXXXX

256 (4x64) Kbytes

SA111–SA114

11010XXXXX

256 (4x64) Kbytes

SA115–SA118

11011XXXXX

256 (4x64) Kbytes

SA119–SA122

11100XXXXX

256 (4x64) Kbytes

SA123–SA126

11101XXXXX

256 (4x64) Kbytes

SA127–SA130

11110XXXXX

256 (4x64) Kbytes

SA131–SA133

1111100XXX,

1111101XXX,

1111110XXX

192 (3x64) Kbytes

SA134

1111111000

8 Kbytes

SA135

1111111001

8 Kbytes

SA136

1111111010

8 Kbytes

SA137

1111111011

8 Kbytes

SA138

1111111100

8 Kbytes

SA139

1111111101

8 Kbytes

SA140

1111111101

8 Kbytes

SA141

1111111111

8 Kbytes

Sector

A21–A12

Sector/

Sector Block Size

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