AM29DL642G datasheet(21/54 Pages) AMD

21 / 54 page

June 10, 2005

Am29DL642G

PRELIMINARY

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

7).

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 7.

Am29DL642G 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 23 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

unprotects all sectors in parallel. All previously pro-

tected sectors must be individually re-protected. To

change data in protected sectors efficiently, the tem-

porary sector unprotect function is available. See

“Temporary Sector Unprotect”.

Sector

A21–A12

Sector/

Sector Block Size

SA0

0000000000

4 Kwords

SA1

0000000001

4 Kwords

SA2

0000000010

4 Kwords

SA3

0000000011

4 Kwords

SA4

0000000100

4 Kwords

SA5

0000000101

4 Kwords

SA6

0000000110

4 Kwords

SA7

0000000111

4 Kwords

SA8–SA10

0000001XXX,

0000010XXX,

0000011XXX,

96 (3x32) Kwords

SA11–SA14

00001XXXXX

128 (4x32) Kwords

SA15–SA18

00010XXXXX

128 (4x32) Kwords

SA19–SA22

00011XXXXX

128 (4x32) Kwords

SA23–SA26

00100XXXXX

128 (4x32) Kwords

SA27-SA30

00101XXXXX

128 (4x32) Kwords

SA31-SA34

00110XXXXX

128 (4x32) Kwords

SA35-SA38

00111XXXXX

128 (4x32) Kwords

SA39-SA42

01000XXXXX

128 (4x32) Kwords

SA43-SA46

01001XXXXX

128 (4x32) Kwords

SA47-SA50

01010XXXXX

128 (4x32) Kwords

SA51-SA54

01011XXXXX

128 (4x32) Kwords

SA55–SA58

01100XXXXX

128 (4x32) Kwords

SA59–SA62

01101XXXXX

128 (4x32) Kwords

SA63–SA66

01110XXXXX

128 (4x32) Kwords

SA67–SA70

01111XXXXX

128 (4x32) Kwords

SA71–SA74

10000XXXXX

128 (4x32) Kwords

SA75–SA78

10001XXXXX

128 (4x32) Kwords

SA79–SA82

10010XXXXX

128 (4x32) Kwords

SA83–SA86

10011XXXXX

128 (4x32) Kwords

SA87–SA90

10100XXXXX

128 (4x32) Kwords

SA91–SA94

10101XXXXX

128 (4x32) Kwords

SA95–SA98

10110XXXXX

128 (4x32) Kwords

SA99–SA102

10111XXXXX

128 (4x32) Kwords

SA103–SA106

11000XXXXX

128 (4x32) Kwords

SA107–SA110

11001XXXXX

128 (4x32) Kwords

SA111–SA114

11010XXXXX

128 (4x32) Kwords

SA115–SA118

11011XXXXX

128 (4x32) Kwords

SA119–SA122

11100XXXXX

128 (4x32) Kwords

SA123–SA126

11101XXXXX

128 (4x32) Kwords

SA127–SA130

11110XXXXX

128 (4x32) Kwords

SA131–SA133

1111100XXX,

1111101XXX,

1111110XXX

96 (3x32) Kwords

SA134

1111111000

4 Kwords

SA135

1111111001

4 Kwords

SA136

1111111010

4 Kwords

SA137

1111111011

4 Kwords

SA138

1111111100

4 Kwords

SA139

1111111101

4 Kwords

SA140

1111111101

4 Kwords

SA141

1111111111

4 Kwords

Sector

A21–A12

Sector/

Sector Block Size

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