L320DB90VC datasheet(19/57 Pages) AMD

19 / 57 page

December 14, 2005

Am29LV320D

DA TA SH EET

Sector/Sector Block Protection and

Unprotection

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.

(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 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 V

ID on the

RESET# pin only, and can be implemented either

in-system or via programming equipment. Figure 2, on

page 19 shows the algorithms and Figure 25, on page

47 shows the timing diagram. This method uses stan-

dard microprocessor 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 sectors must be in-

dividually re-protected. To change data in protected

sectors efficiently, the temporary sector unprotect

function is available. See “Temporary Sector Unpro-

tect” on page 18.

The alternate method intended only for programming

equipment, and requires V

ID on address pin A9 and

OE#. This method is compatible with programmer rou-

tines written for earlier 3.0 volt-only AMD flash de-

vices. For detailed information, contact an AMD

representative.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors at its factory prior to shipping the device

through AMD’s ExpressFlash™ Service. Contact an

AMD representative for details.

It is possible to determine whether a sector is pro-

tected or unprotected. See “Autoselect Mode” on

page 16 for details.

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

Sector / Sector

Block

A20–A12

Sector/Sector Block Size

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