AM29LV320DB90WMF datasheet(17/55 Pages) SPANSION

17 / 55 page

November 15, 2004

Am29LV320D

Sector/Sector Block Protection and

Unprotection

The hardware sector protection feature disables

both program and erase operations in any sec-

tor. The hardware sector unprotection feature

re-enables both program and erase operations

in previously protected sectors. Sector protec-

tion/unprotection can be implemented via two

methods.

(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 unpro-

tected at the same time (see Table 7, on

page 17 and Table 8, on page 17).

Table 7. Top Boot Sector/Sector Block

Addresses for Protection/Unprotection

Table 8. Bottom Boot Sector/Sector Block

Addresses for Protection/Unprotection

Sector Protection and unprotection requires VID

on the RESET# pin only, and can be imple-

mented either in-system or via programming

equipment. Figure 2, on page 19 shows the al-

gorithms and Figure 25, on page 47 shows the

timing diagram. This method uses standard mi-

croprocessor bus cycle timing. For sector un-

protect, all unprotected sectors must first be

protected prior to the first sector unprotect

write cycle.

The sector unprotect algorithm unprotects all

sectors in parallel. All previously protected sec-

tors must be individually re-protected. To

change data in protected sectors efficiently, the

temporary sector unprotect function is avail-

able. See “Temporary Sector Unprotect” on

page 18.

The alternate method intended only for pro-

gramming equipment, and requires VID on ad-

dr es s pi n A9 an d OE # . Th i s me t h od i s

Sector / Sector

Block

A20–A12

Sector/Sector Block

Size

SA0-SA3

000000XXX,

000001XXX,

000010XXX

000011XXX

256 (4x64) 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 (3x64) 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 / Sector

Block

A20–A12

Sector/Sector Block

Size

SA70-SA67

111111XXX,

111110XXX,

111101XXX,

111100XXX

256 (4x64) 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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