AM29DL322C datasheet(16/52 Pages) AMD

16 / 52 page

Am29DL322C/Am29DL323C

ADV ANCE

I N FO RMAT I O N

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 Tables

8 and 9).

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 8.

Top Boot Sector/Sector Block Addresses

for Protection/Unprotection

Table 9.

Bottom 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.

Sector

A20–A12

Sector/

Sector Block Size

SA0

000000XXX

64 Kbytes

SA1-SA3

000001XXX,

000010XXX

192 (3x64) Kbytes

SA4-SA7

0001XXXXX

256 (4x64) Kbytes

SA8-SA11

0010XXXXX

256 (4x64) Kbytes

SA12-SA15

0011XXXXX

256 (4x64) Kbytes

SA16-SA19

0100XXXXX

256 (4x64) Kbytes

SA20-SA23

0101XXXXX

256 (4x64) Kbytes

SA24-SA27

0110XXXXX

256 (4x64) Kbytes

SA28-SA31

0111XXXXX

256 (4x64) Kbytes

SA32-SA35

1000XXXXX

256 (4x64) Kbytes

SA36-SA39

1001XXXXX

256 (4x64) Kbytes

SA40-SA43

1010XXXXX

256 (4x64) Kbytes

SA44-SA47

1011XXXXX

256 (4x64) Kbytes

SA48-SA51

1100XXXXX

256 (4x64) Kbytes

SA52-SA55

1101XXXXX

256 (4x64) Kbytes

SA56-SA59

1110XXXXX

256 (4x64) Kbytes

SA60-SA62

111100XXX,

111101XXX,

111110XXX

192 (4x64) Kbytes

SA63

111111000

8 Kbytes

SA64

111111001

8 Kbytes

SA65

111111010

8 Kbytes

SA66

111111011

8 Kbytes

SA67

111111100

8 Kbytes

SA68

111111101

8 Kbytes

SA69

111111110

8 Kbytes

SA70

111111111

8 Kbytes

Sector

A20–A12

Sector/Sector Block

Size

SA70

111111XXX

64 Kbytes

SA69-SA67

111110XXX,

111101XXX,

111100XXX

192 (3x64) Kbytes

SA66-SA63

1110XXXXX

256 (4x64) Kbytes

SA62-SA59

1101XXXXX

256 (4x64) Kbytes

SA58-SA55

1100XXXXX

256 (4x64) Kbytes

SA54-SA51

1011XXXXX

256 (4x64) Kbytes

SA50-SA47

1010XXXXX

256 (4x64) Kbytes

SA46-SA43

1001XXXXX

256 (4x64) Kbytes

SA42-SA39

1000XXXXX

256 (4x64) Kbytes

SA38-SA35

0111XXXXX

256 (4x64) Kbytes

SA34-SA31

0110XXXXX

256 (4x64) Kbytes

SA30-SA27

0101XXXXX

256 (4x64) Kbytes

SA26-SA23

0100XXXXX

256 (4x64) Kbytes

SA22–SA19

0011XXXXX

256 (4x64) Kbytes

SA18-SA15

0010XXXXX

256 (4x64) Kbytes

SA14-SA11

0001XXXXX

256 (4x64) Kbytes

SA10-SA8

000011XXX,

000010XXX,

000001XXX

192 (3x64) Kbytes

SA7

000000111

8 Kbytes

SA6

000000110

8 Kbytes

SA5

000000101

8 Kbytes

SA4

000000100

8 Kbytes

SA3

000000011

8 Kbytes

SA2

000000010

8 Kbytes

SA1

000000001

8 Kbytes

SA0

000000000

8 Kbytes

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